An anon on /pol/ has been claiming that there is a coordinated

>>61810624
https://en.wikipedia.org/wiki/Steganography

>>61810624
Reads like schizo rambling. Yeah I buy it

>>61810721
same reason I'm more inclined to believe.

Frank is a certified schizo who takes already speculative information and adds his weird ass spin to it, and post it under a trip. He then uses proxies to discuss the info with himself.
He doubled down on this stuff when he got doxed. Dude is pretty unhinged.

anything can be deleted

>>61810624
It is actually possible

File: steg.jpg (81KB, 208x627px) Image search: [Google]

81KB, 208x627px

>>61810699
Interesting, but could screenshots of text actually produce the things he is describing in OP?

Yesterday there was a thread of some guy that posted a PNG, if you converted (or extracted, whatever the fuck) the PNG into a 10-bit BMP and then deleted the BMP header (first 138 bits IIRC) you got a vfat filesystem that contained a webm with sound.

>>61810910
Yes
People used to do it all the time on here to send CP
Now than 4chin is too mainstream you rarely ever see that shit around here anymore

>>61811203
so 4chan currently has no safeguards against this?

>>61810624
so this is /pol/?
these are the people who come here and shit up the board?

>deep drive
lmao

>>61811237
>if you edit a file you make it into something else!
There is no way to safeguard against this, and it really isn't something to be concerned about. If you edit default wallpapers enough, I'm sure you could make those into photo realistic cp too.

>>61811237
you can embed stuff in images, sure. You can't magically do it in a way that it will stay on the hard drive, though.
This is /x/ levels of retarded.

>>61810954
That's an old method for embedding files, people used to use it to share ebooks and music (and malware, you can see an example of it in the 4chan.hta banner). It's pretty obvious when it's being used anyway.

>>61810624
Let's pretend for a second that this was actually possible. Why would they do all this shit, if they can just seize your hard drive and claim there is CP on it? It's not like they would need actual evidence if they had all this power.

>>61811299
This, if the government wants to take you down all they have to do is take your harddisk and plant CP on it. They do it with drugs all the time.

>>61811417
What the fuck


Mods

>>61811282
Why isn't this being done nowadays?

>>61811548
Because it just obfuscates the data, it doesn't protect it in any way, eg. Sharing cp can still be discovered because there's a database with the hashes of /most/ images
So it only helps against people who are not that tech savvy.

T. Guessing anon

>>61810624
Typical /pol/ larper

>>61811548
The common way is easily detected. I can't remember which but 4chan either strips the appended file from the image or prevents you from uploading it. Other ways, as in the cat picture that was in a picture of a tree almost certainly get by and I'm willing to bet that there is at least one or two guys hiding sketchy shit in random images to then upload on places like 4chan to get off on the idea.

>>61811548
>>61812859
>>61811203
>>61811299
>>61810624
>>61810853
>>61810910
Does no one seriously remember sink posting?

>>61810624
>Implying we actually know anything about technology here.

>>61810624
>I don't know what sinks are

They were a thing on /b/ back in the day.

>>61811606
>Sharing cp can still be discovered because there's a database with the hashes of /most/ images

This is the dumbest shit I've read on /g all day.

>>61813029
https://www.nist.gov/oles/forensic-database-tech-digital-evidence-table

Entry number 2, stay retarded.

>>61812991
>>61811203
People used to hide shit in .rar files which were then hidden in images in a buffer zone, not splicing two images together.

>>61811237
4chan hasn't allowed uploading images with embedded content for years.

Post sinks

>>61811282
4chan.hta wasn't a regular image with content embedded into it, it was a custom-generated image that when interpreted correctly would run as a script. The image itself was a script that was then made into an image, rather than a script being hidden inside of the image.

File: 1495363647626.png (304KB, 479x444px) Image search: [Google]

304KB, 479x444px

>>61812991
Mods slep

Post sinks, go!

File: 1399502050328.jpg (28KB, 300x441px) Image search: [Google]

28KB, 300x441px

>sinkposting was cp
Ho Lee sheet. I came to /b/ back when it was still popular and always thought it was just a dumb thing they do solely as a dumb inside joke. Even after file embedding became popularized right before it was banned because they would do the same thing for cheese pizza it never occurred to me sinkposting was the same thing.

>>61811237
I used to get error messages when trying to post an image that false-positived an embed.

There's probably some safeguard against it

What's the ratio that triggers corrupt image format?

>>61810624
> anon5 redpill.jpg
Wow, those are some advanced schizo techniques.

Ok, so CP can be embedded in images. But if you delete the photo, it stays deleted right? That anon said you cant delete the CP.

>>61813076
>Entry number 2, stay retarded.

What I meant, you fucking imbecile, was that a hash table would be pointless for detecting stegs in a medium where a bazillion new files enter every day. You clearly know nothing about the subject so just stay out of it.

>>61813115
>4chan hasn't allowed uploading images with embedded content for years.
so is this still possible
>>61810910
but the whatever sinkposting was is not anymore?

Also, the other anons are right, why would they go through all the trouble and give you an image that takes "advanced tech" only available to spooks to decrypt? wouldn't that only give you plausible deniability that you actually knew what it contained? It makes much more sense to just seize your comp and plant direct evidence.

>>61810624
Stop browsing /pol/. That poster is clearly schizophrenic and being around these kind of people WILL deteriorate your mental health.

>>61813365
"deleting" something on most computer systems doesn't strictly speaking "delete" it, it marks the physical area of the storage as free, and thus able to be overwritten.

If you want to truly delete something, you have to remove it and then overwrite the space it used to occupy.

>>61813405
I don't know if the technique in that picture is possible to upload, but I suspect that it would be because I doubt it can be safeguarded against - it's a valid image with no true modification.

To my knowledge, plausible deniability would throw the entire case out of the window, but then again, I doubt "they" would be relying on a case, they would probably just blackmail you with the threat of a case.

It's not possible on 4chan anymore, the images are processed to remove hidden data. This was after CP was spread through .rar files embedded into images and the FBI were in contact with Moot.

You're welcome.

-NSA

>>61810624
>An anon on /pol/
Stopped reading

>>61813435
thanks for looking after us

https://github.com/AlphaDelta/PNG-Mask

>>61813472
>>61813480
>>61813490
>>61813507
>d-don't click, g-guys

File: 147134984741.jpg (8KB, 250x230px) Image search: [Google]

8KB, 250x230px

>>61813521
what is it supposed to be? please im beyond spooped. no way am i enlarging those

>>61813472
>>61813480
>>61813490
>>61813507
What was in these, I went full retard and clicked them

>>61813213
Feels good to be naive for once.

File: test.png (197KB, 480x484px) Image search: [Google]

197KB, 480x484px

>>61813519

>>61813434
>it marks the physical area of the storage as free, and thus able to be overwritten.
With SSD's a trim will likely destroy that data. And yes, undeleting shit from an SSD is next to impossible. Shit gets destroyed real fucking fast.

>>61813435
Not sure if LARP fag, but the post is true.

This WAS a problem several years ago (I'd say 3-4+ years), but not any more.

>>61810624
He's full of shit, but for other than technical reasons.

File: cap.png (137KB, 645x371px) Image search: [Google]

137KB, 645x371px

>>61813578
Yep, still works.

File: anon5.jpg (312KB, 500x652px) Image search: [Google]

312KB, 500x652px

daily reminder that anonymous5 always tells the truth, he has infiltrated the inner cabal and is part of a top secret organization that is in possession of advanced conscious artificial intelligences that fight the good fight, he knows all the locations where ultra top secret free energy devices are stored, also aliens were in contact with the pre-fall of humanity civilizations and now have observed us thousands of years after our fall
daily reminder that black budget tech is centuries ahead of what we have now, and could transform our civilization overnight

>>61813541
Somebody answer me I'm spooked

File: out.jpg (92KB, 500x663px) Image search: [Google]

92KB, 500x663px

>>61813644
Impressive

>>61813752
mpv --demuxer=lavf --demuxer-lavf-format=ogg https://i.4cdn.org/g/1502277469645.png

OR

ffplay -f ogg https://i.4cdn.org/g/1502277469645.png

>sink and cheese pizza was cp all along
amazing

>>61810954
Was that the final fantasy image in the cyb/sec general?

>>61813804

The obscured pictures you had to decode to reveal the nude girl were jam packed of CP as well and it flew right under the mods noses.

>>61813851
GMask, like a wall of nostalgia

>>61812991
>>61812991
GMASK, remember that shit?

>>61813851

fingerbox threads as well everyone thought it was just an inside joke for oldfags

>>61810721
>>61810742
It's possible, we're all wanted targets here

>>61813752
Very cool. How's this put together? Is it just a PNG where the data after compression happens to look like a valid OGG?

>>61813967
I don't think so, that steganography method can be implanted pretty much anywhere in a file and affect the appearance in no way.

See: https://track5.mixtape.moe/ejfbhp.png

>>61814032
If it's just got an OGG in a text chunk or something, then why does the image itself need to be 5000px wide and full of noise?

File: playmeinwinampkanako.jpg (687KB, 848x480px) Image search: [Google]

687KB, 848x480px

>>61811237
You can't upload images with embedded shit anymore.

>>61814139
I was saying it probably isn't just data in a chunk, rather the noise is the image and there's some decoding going on, I don't know how but that's my best guess.

>>61814169
*the noise is the data

>>61814165
yeah you can you FBI nigger

>>61814165
oh I guess you can or not unless I modifying that image I dont have winamp installed anymore.

>>61810624
here is an archive link from back a few years where people where search for emended files in there pictures
https://warosu.org/g/thread/S31940199

>>61814165
What about these?
>>61813578
>>61813644

>>61810624
Please go back to /pol/ and stay there

>>61810624
anon5 is a LARPer who claims they swap in trannies during porn anal scenes to make it more degenerate to fap to, and has threatened to send spine beetle assassins to those that question his credibility. Plus you are talking about a board which over half the people on it think posting memes got a president elected, so I wouldn't take most of what /pol/ says without a heavy dose of salt.

File: Capture.png (100KB, 1075x725px) Image search: [Google]

100KB, 1075x725px

>>61814201
>https://warosu.org/g/thread/S31940199
fuck I remember that thread. The only shit I found was furry porn

>>61814253

Did anyone find the code you search in Google images and shows thousands of CP?

>>61813967
The bytestream of an ogg wrapped opus file is padded with 0s so that the size corresponds to the size of the closest fitting 80 line height 64bit RGBA raster. 80 line height is used so that the width would be as wide as possible because png has additional data at every line start which causes playback corruption for a short while not to mention 4chan image size limits. 64bit RGBA pixel format is used for the same purpose, to store more data on a single line. This also helps to perfectly map the original file to a rectangle thus preserving original data and not have ffmpeg complain.
Outside of this, data chunks also have compression headers that can't be skipped, so playback corruption happens mid line anyways, this can't be minimized as far as I tried.

Once the ogg file is prepared, png file can be made:

ffmpeg.bat -f rawvideo -s 4915x80 -pixel_format rgba64be -framerate 1 -i input.png -compression_level 0 output.png

Width depends on your target file size. Skipping compression is crucial.
Last step is to combine all IDAT chunks into a single one to further minimize playback corruption. This can be done with optipng:

optipng -o0 output.png

The ogg header is close enough to the start of the file so libavformat that mpv uses picks it up. Alternatively you can specify offset using --demuxer-lavf-o=skip_initial_bytes=.

This imo is a good method because it requires a minimal toolset to view the original files at a slight cost of corruption. The opus contains 50 minutes of audio at only 3 megs.

>>61814349
Ah, so the raw pixel data is exactly the opus file, and the PNG is saved uncompressed so it's left mostly intact, similar to .bmp?

I wonder if there might be a better way to interleave the two files. If ogg/opus supports dividing the audio data into multiple chunks, then it might be possible to put the ogg equivalent of a text chunk aligned with each PNG line break, and get rid of the playback corruption that way. Or in other words, split the audio into chunks each the size of one line of the image, and make the decoder skip over the PNG headers between lines.

>>61814480
>Ah, so the raw pixel data is exactly the opus file, and the PNG is saved uncompressed so it's left mostly intact, similar to .bmp?
Well a bmp is completely intact except that bmp has lines start backwards or something, so the it's best to overwrite the bmp bytestream with ogg directly.

I can't comment your second point cause I'm not yet familiar with ogg or opus bytestream. png also has "deflate" compression headers even when nothing is compressed. I'm not familiar with specifics of that.

File: ss-2017-08-09-15-10-20.png (30KB, 363x74px) Image search: [Google]

30KB, 363x74px

>>61810624
it is possible but this guy is obviously full of shit and probably mentally ill. I'm still not sure whether people unironically believe the stuff posted on /pol/ or I'm just getting baited this hard every time

File: a.png (636KB, 640x480px) Image search: [Google]

636KB, 640x480px

>>61814349
instead of dealing with png structures getting in the way, you can just extract the pixel data to get the original data back

mpv <(convert a.png -alpha extract gray:-)

>>61810624

I've read the specification for PNG so I know about the different chunks. It seems like most readers should be robust enough to just ignore chunks that they don't recognize.

>>61810910
>>61811203
that's not what OP's image is talking about

the so-called "deep drive" content infects your drive with copies of itself - that just by having the image on your system, it somehow executes code that copies the content elsewhere on your computer

>>61813115
>4chan hasn't allowed uploading images with embedded content for years.
i know it was a good thing to crack down on pedos but i still miss all those threads with people passing around ebooks

>>61814253
shit i remember that thread. i think i still have the tool around somewhere too

never found anything interesting though

>>61814660
microsoft bitmap (.bmp) mirrors the traditional coordinate system of 0,0 being at the bottom left of the image, not the top left like how most computers draw images
this makes the pixels in .bmp files effectively reversed compared to other formats which have 0,0 at the top left

>>61813752
fucking amazing. how can I make these myself?

>>61815245
>the so-called "deep drive" content infects your drive with copies of itself
lulwut

File: 10472409.jpg.png (884KB, 1366x768px) Image search: [Google]

884KB, 1366x768px

>>61813435
>take each pixel in an image
change the pixel value to the closest whole number of the form (0, 10, 20, ..., 240), ignore 250+
set each pixel value to its value + 0-9 depending on which colour value you want
you now have a way to embed images with 10 colour levels into any image up to the host-images resolution

>>61815279
I still do, but they don't work on any of the test ones in this thread. Needs an update

File: test.png (317KB, 2250x18px) Image search: [Google]

317KB, 2250x18px

>>61815025
Well that way you also lose any dynamic skipping for the hidden content so it's good only for files shorter in content.
Comfy music though.

Attaching your track as I converted it. Some corruption here and there.
Run with:

mpv --demuxer=lavf --demuxer-lavf-format=matroska --demuxer-lavf-o=skip_initial_bytes=70 test.png

>>61815474
did you not read the image?
>It's called "Deep Drive" CP because it's still in the computer(s) even if the images are deleted adn special/advanced tech/hardware/security systems are required to spot/detect it. (This type of CP is predominantly used for Blackmail & Compromising. CP Distributors have access to it)

>>61814228
>/po/fags makes a thread
>best thread on /g/ in a long time
go back to your /v/ideo game threads fag

>>61815607
Plain retarded.

File: out.png (291KB, 160x240px) Image search: [Google]

291KB, 160x240px

>>61815581
>Well that way you also lose any dynamic skipping for the hidden content so it's good only for files shorter in content.
not sure what you mean by that
also keep in mind i didn't need to put it in the alpha channel, i could use the entire image

mpv <(convert out.png rgba:-)

>>61815668
I'm not sure how it works on leenucks but there's no skipping possible using piping on Windows.

>>61815694
oh, are you referring to /seeking/?
you can forcibly enable seeking with mpv, allowing to seek within the buffer

mpv --force-seekable=yes <(convert out.png rgba:-)

>>61815668
Very nice.

>>61813130
>>61811282
Cornelia is the format name there is also snowcrash
From an archive of encyclopedia dramatica describes how to create them http://archive.is/XszdS

Both are very obvious with a band of random looking data

>>61815708
Is it possible to force the UI somehow? Only mpv.com accepts pipe input but that opens UI only if video stream is present.

File: out.png (4MB, 640x760px) Image search: [Google]

4MB, 640x760px

>>61815803
does it matter if there's no video?
here's a video, btw, over 5 minutes, in fact

mpv --force-seekable=yes <(convert out.png rgba:-)

>>61815848
That's how it works. On Windows any command line interaction including piped input works via mpv.com, which is a wrapper for mpv.exe.

>>61813592
Where can i find that program? All i can find is a github page.

>>61815878
looked in the man page, you can force a window to be shown with "--force-window=yes"

>>61813580
if you were to save the image, it would most likely be to a HDD, semi-moot point.

>>61815803
mpv test.wav --force-window=yes

>>61815848
How are you making these?

>>61815965
simply;

convert -depth 16 -size 640x760 rgba:out.mkv out.png

it wouldn't be hard to automatically determine an approprate image size for the input, i just haven't yet bothered

>>61811430
Fuck. Why did I have to open that?

>>61815908
ok this is better, but seeking backwards is out of the question, commands that correspond to caching don't work in this case.

File: a.webm (265KB, 712x512px) Image search: [Google]

265KB, 712x512px

>>61816038
seeking works fine here

>>61816084
Not the case on Windblowz.

>>61815997
And what about the previous ones?

Why would you think deep dive involves some kind of stenography. It's likely that it couldn't be proved in court if you had a bunch of hidden images and you didn't have a program which could retrieve the hidden image.
Additional chunks especially on block boundaries which are valid images themselves is much more likely. Fireworks had a way of storing multiple layers in a png. Or storing multiple thumbnails in the image, though not sure if 4chan stripe them.

If the hidden data is itself a valid image and more so if it's block aligned forensic tools are more likely to find it

>saving images from 4chan directly
>not saving a screenshot of said image at 10% jpg quality

>>61810624
frank is a larping faggot. none of his threads have any relevance outside his own mind.

>>61816109
don't really have an answer for that, only really started using pipes after moving to linux, so i'm not too familiar with piping in windows
you can always just dump to a file and open that in mpv, that is, don't use a pipe

>>61816111
this >>61815668
is the same,
this >>61815025
i just did in gimp, because i couldn't be bothered reading into how to do it in imagemagick (that is, i made the alpha channel using imagemagick using "gray:..." instead of "rgba:...", then used gimp to apply it to another image)
i didn't do the other images itt

>>61816121
Black person alert.

>>61813536
Table-breaking images that fuck with your browser

File: retarded you.jpg (25KB, 480x360px) Image search: [Google]

25KB, 480x360px

>>61810624
someone explain to me how a ''deep drive'' image can resist

shred -zu

because im not buying this at all

>>61816206
>buying anything /pol/ says related to technology

>>61816206
Maybe it fits in the firmware gaps. Not a lot of room for pizza in there though.

>>61816222
this makes the most sense. its outright false

>>61816238
not buying it.

>>61816176
>you can always just dump to a file and open that in mpv, that is, don't use a pipe
That is a weak approach and more cumbersome.

>>61811548
Because hotpockets will issue a ban request on you within 5 seconds of posting it.

>>61816238
So the NSA has malware that can execute simply by being downloaded while hidden inside of a .png file that can escalate to a privilege level that allows arbitrary firmware modification. And it's multiplatform. No, it’s /pol/ being fearmongering idiots again.

File: 1489954517498.png (847KB, 683x913px) Image search: [Google]

847KB, 683x913px

>>61810624
Oh wow. Deep drive, just like deep web. Spooky!!

>>61816319
I'm trying to be constructive instead of belittling everything over a dumb tripfag. You can fuck right off m9.

>>61811282
you can convert any data file into a bmp quite easily if you just constuct a bmp header for the file

only 54 bytes for a bmp header and can be constructed quite easily
>http://www.fastgraph.com/help/bmp_header_format.html

File: out.jpg (3MB, 2048x3000px) Image search: [Google]

3MB, 2048x3000px

>>61816121
jokes on you, you can put raw audio into jpeg as well, so resizing or lowering it's jpeg quality will just make it sound worse, not completely destroy the audio

mpv --force-seekable=yes --demuxer=rawaudio --demuxer-rawaudio-rate=32000 --demuxer-rawaudio-format=u8 <(convert out.jpg gray:-)

>>61811299
this.

if they want you they will put shit on your computer without you knowing it and then arrest you.

maybe even trick you into downloading an image with embedded crap on it you never knew was there

>>61816319
Yup the NSA wouldn't have anything like that. That's basically what stuxnet used.

https://www.sophos.com/en-us/security-news-trends/security-trends/shortcut.aspx

The Windows Shortcut Exploit, also known as CPLINK, is a zero-day vulnerability in all versions of Windows that allows a Windows shortcut link, known as an .lnk file, to run a malicious DLL file.
The exploit works when you open a device, network share or WebDav point carrying an infection—you don't need to click on anything for the exploit to work, even if you have AutoPlay and AutoRun disabled

>>61816364
can
you
make
a
guide
for
doing
this
please
I remember these form back in like '10 and never learned how to do it myself.

>>61815848
>>61815668
MODS

>>61813076
so your saying the US Govt is the worlds single largest holder of child pornography, keeping a copy of every cp video and image ever found?

goddam murrica

>>61816406
also the largest distributor

>>61816391
that's just;

ffmpeg -i input -c:a pcm_u8 -f u8 -ar 32000 out.u8

to make the raw audio, then;

convert -depth 8 -size 2048x3000 gray:out.u8 -quality 98 out.jpg

to encode it to jpeg

>>61816414
i dont fucking doubt it

they likely think the best way to catch people with cp is to hand it out to everyone

>>61815517
And how would you extract from that?

>>61816406
>he US Govt is the worlds single largest holder of child pornography
That's unironically true. The CIA keeps huge CP archives and has many agents dedicated to watching them.

>>61816448
(((agents)))

>>61816446
check each pixel value
your intensity value is the distance (downwards (floored)) to the closest 0, 10, 20, ...

>>61816440
FBI lets plenty of pedos free because they can't say how they caught them, or how they knew where the CP was. It's just like burning tax dollars.
>use honeypots to catch pedos by giving them cp
>let them go in favor or maintaining cp reserves to catch more
GOODBYE MONEY

File: laughing.jpg (18KB, 300x168px) Image search: [Google]

18KB, 300x168px

>>61813912

>>61816364
that sort of reminds me when people where putting random files as raw audio through audacity.
still have a few of them
http://s000.tinyupload.com/?file_id=14766811006583938995

>>61816388
>Windows Shortcut Exploit
>multiplatform
besides, the whole premise was that such a malicious file would be wholly contained in an image file - that's not compatible with the shortcut link attack

>>61816397
there's nothing illegal about the embedded content, and in the years i've posted images like those, i haven't been so much as warned, nor have the threads been deleted prematurely, so as far i can tell, they're allowed, at least as a topic of interest in themselves

>>61814289
?

>>61816489
>>61816448
sadly I believe this to be true

>>61816364
>screenshot of said image
How would the audio information persist?

>>61814289
i thought it was actually some 'nudist' pictures or something it was just a website that only showed 'nudist' childred

File: what.png (392KB, 570x599px) Image search: [Google]

392KB, 570x599px

>>61816728
are you talking about the 4chan archive site?

File: 960002.png (95KB, 327x99px) Image search: [Google]

95KB, 327x99px

Who /else/ blocked?

>>61816694
If the initial file uses an error prone streaming format like mpegts then even screenshots could be made. Not kidding. On playback there would be some artifacting but it'll recover, zooming into the image is no problem, but it would be smart to limit outside image content.

File: a.jpg (512KB, 1707x2500px) Image search: [Google]

512KB, 1707x2500px

>>61816694
a screenshot by itself doesn't change the information, the problem in this case is that the image is large, so a screenshot will likely be scaled down, which discards some of the original information, but raw audio is ... raw, if you scale it back, it will play, it will just be lower quality

for example, here's the image scaled down a bit and transcoded to 75 quality
scaling down causes vertically adjacent pixels to be blended together, creating the reverb effect you hear

mpv --force-seekable=yes --demuxer=rawaudio --demuxer-rawaudio-rate=32000 --demuxer-rawaudio-format=u8 <(convert a.jpg -resize 2048x3000 gray:-)

File: embed.png (250KB, 1278x736px) Image search: [Google]

250KB, 1278x736px

here is my attempt at embedding an image inside of an other image, original coming up in a reply post as well as some explanation

File: capture.jpg (42KB, 1280x720px) Image search: [Google]

42KB, 1280x720px

>>61816787
>>61816802
Wow, I thought it'd be lost for good. Thanks for the explanation.

>>61816847
I cannot seem to post the original image and explanation for some reason...

>>61816853
np, raw samples like these act more like analog information, in that altering them somewhat only alters how close they are to the original/source data, rather than simply destroying their recoverability
think of like taking a printed photo, scanning it at a lower resolution, then printing it out again at the original size, you've created a downsampled version of the original, but is likely still recognizable, this works on the same principle

>>61816847
>>61816949
ok looks like it worked this time (wtf)
Anyway, here is the code is on pastebin, id: Wke1j7HU

It changes last bit of each of pixel's colors to a bit from the input stream, so 1 byte gets stored over 3 pixels with blue color on last pixel untouched.

Original image is from the /g/ humor thread (catalog)

>>61816998
>Original image is from the /g/ humor thread (catalog)
If the image had existed, 4chan would attempt to prevent duplicates via hash matching or something something, no?

>>61817019
yea, no two identical images can be live at once

>>61817019
Maybe that was the reason, I too knowledgeable about how 4chan manages images.

Then again, I was not posting that exact image, but rather one loaded and saved (unmodified) with Python. It had a slightly larger size, probably due to compression differences. And 4chan didn't complain about the image being a dup, simply said "Connection error"

File: 960001.png (3MB, 1066x828px) Image search: [Google]

3MB, 1066x828px

>https://www.4chan.org/rules
>17. Do not upload images containing additional data such as embedded sounds, documents, archives, etc.

This rule was unjustly applied in my case.
It only concerns "embedded" data. Here's the description of "embedded":

>1. To fix firmly in a surrounding mass: embed a post in concrete; fossils embedded in shale.
>2.
>a. To cause to be an integral part of a surrounding whole: "a minor accuracy embedded in a larger untruth" (Ian Jack).
>b. Linguistics To insert or position (a clause or phrase) within a clause or phrase.
>c. Computers To insert (a virus, for example) into a software program.

HOWEVER there was no embedded data in my image. Every image pixel value was the exact byte value found in the media file, it wasn't inserted next to the raster data or somehow obfuscated.

A noisy uncompressed png image thus cannot be culprit for this rule on any grounds. Learn the difference, jannies.

>>61817090
so basically it's like uploading a picture of 1s and 0s and having a program turn it back to music?

>>61815916
I don't have HDD's in my system.

>>61810624
Guys why aren't there more steganography browser addons? It'd be great if you could just leftclick an image and press "Steganography" to have it perform the most common combinations used, and then show you each image with those combinations performed. Obviously there could still be encryption, but whatever we'd never be able to see that anyways.

>>61817159
it's simply a matter of interpretation
things like >>61815848 are in every way perfectly valid png files, with no "additional" data
it's simply that you can interpret the raw pixel values as being something other than a raw bitmap image, in this case, the raw pixels describe an mkv video file, byte for byte
it's tough to call that embedded, as there is no other kind of data in the file

There was once a plugin shilled here on /g/ which embedded messages in your images and displayed others messages, making kind of a textboard inside an image board. It was pretty nifty and it's sad it never really took off besides the 10 or so threads here. I think it was called DesuDesu something, you might find a thread if you visit the archives.

>>61817462
DesuDesuTalk primarily used by russians on lainchans /layer/ board. It's pretty cool, but it's rarely used anywhere else

>>61817503
Yeah, that was it! Thank you anon.

>>61817598
/g/ should have a layer thread for fun, but mods would probably ban everyone. Oh well.

File: $_1.jpg (30KB, 355x400px) Image search: [Google]

30KB, 355x400px

Daily reminder that there are images broadcasting number stations here and on the internet. The more the images are shared the more the numbers spread.

Stay spoopy.

>>61817631
This does not make sense. Fucking idiot.

>>61817650
Images contain messages encoded in OTPs, they're embedded in the images in a way that does not visually change the image too much. These are usually popular images of memes like the gay nigger frog or annoying chinese cartoon preteens.

People keep posting them without knowing they have tye messages. Other people open the images to find the messages with their list of OTP codes.

Now the only things feds/cia can know is maybe who first made the image but not who got it.

>>61817631
are you taking about SSTV transmissions?
https://www.youtube.com/watch?v=OFlcEfgawKI

>>61817711
That's not a numbers station, you fucking moron.
Also, not fucking practical.

>>61817090

What happened to you?

>>61817724
No, numbers are directly encoded into the images supposedly by alternating saturation in places where the color is the same (thus why cartoons are used). The changes are so minute human eyes practically can't see them (reason why we use 4:2:0 chroma subsampling in videos).

>>61817738
I thought the same too until I began analyzing some of the suspected images and found lines of alternating colors inside them. Then I encoded an image a similar way and was able to fit a paragraphs worth of an otp message inside one.

You can definitely find these on /pol/ being pasted over and over again. The recipients know it has an otp message because the image is used over and over and over again.

>>61817886
>not using direct E2E
Retarded /pol/ LARPer.

>>61814971
They used to be either real Nahtzees or ironic.

Now most of the real Nahtzees have left, and it's flooded with underage kiddies from Reddit.

>>61816406
>what are checksums

>>61816777
>>61816728
Do you mean searches like "junior nudist beauty pageant" and such?

>>61817908
I don't know man, go open a few of those images on /pol/ and I guarantee you'll find one of them with strange lines you can only see in image editors. Probably just a way of putting inside jokes for really old oldfags but you never know...

File: filezise.png (53KB, 561x392px) Image search: [Google]

53KB, 561x392px

>>61814165
I'm too lazy to try figuring out at which stage I'm being fucked with, 4chan, Firefox, or my AV.

>>61816415
How do I select the audio file in the second command?

>>61818773
The thumbnail size is 38KB retard.

File: Julie_Furret.png (137KB, 320x240px) Image search: [Google]

137KB, 320x240px

>deep drive
If you mean the fact that data can be recovered from a standard hard disk, yes.

>>>>>deep drive
kek

Steghide works on 4chan. I guess you could use that, or use your own implementation. To do so is against 4chan rules, however.

File: you have to go back.png (54KB, 559x392px) Image search: [Google]

54KB, 559x392px

>>61818994
No.

>>61818922
"gray:out.u8"

>>61819507
it says u8 isn't a format

>>61813541
May have been someone memeing, like he makes 4 mysterious posts, deletes them, then makes a reply saying don't click. But then again, one poster posted genuine CP in the thread already.

>>61819597
it's not
post your command

File: portrait.jpg (44KB, 500x335px) Image search: [Google]

44KB, 500x335px

Testing

>>61819785
actually the error comes from the first command

>>61817969
Write a script to change the blue value by a single digit in the first pixel of every image. Entire United States government defeated by 4chan the hacker yet again.

>>61819859
did you change anything about it besides "input" and/or "out.u8"?

>>61819904
Actually I made an idiot mistake that went away with copy and paste of the command.

>>61820013
let me guess, you skipped "-f u8" thinking it was superfluous?
".u8" was just a convinience on my part, there is no standard extension for raw audio

>>61820037
Alright. How to play the jpeg file with mpv?
And how to make these in png format?
Thank you for your time.

>>61820062
>Alright. How to play the jpeg file with mpv?
with

mpv --force-seekable=yes --demuxer=rawaudio --demuxer-rawaudio-rate=32000 --demuxer-rawaudio-format=u8 <(convert out.jpg gray:-)

(note: if the original audio wasn't stereo, you'll need to tell ffmpeg to convert to stereo or tell mpv here that it's something else)

>And how to make these in png format?
you can just tell convert to output a png instead of a jpeg, but since png is a lossless format, you'd be better off just putting a compressed audio file into a png

File: out.png (994KB, 320x398px) Image search: [Google]

994KB, 320x398px

>>61820132
>>61820062
since you're going to ask,
1. compress further the source if need be, make it an mka to gaurantee streamability

ffmpeg -i input -c:a libopus -b:a 96k out.mka

2. encapsulate into a png

convert -depth 16 -size 320x398 rgba:out.mka out.png

3. play back with;

mpv <(convert out.png rgba:-)

>>61820282
Is the image size always a variable? practicing got me a file-0 and file-1

>>61820393
yes, the size of the image depends on the size of the source file
using the above as an example, the source (out.mka) is 1,020,318 bytes
the image is set to 320x398, which is 127,360 pixels, the pixel format is set to 16bpc (bits per channel), with four channels (r,g,b,a), so 64bpp (bits per pixel)
64bpp, for 127,360 pixels is 8,151,040 bits total raw image data, which is 1,018,880 bytes
this is just shy of the source file, the reason is that the source file happens to not fill the last 320 pixel line, so was cut. in this basic usage, it hardly matters, the playback just might cut out a fraction of a second too soon

>>61820502
(note, this is the long explanation, i've just been too lazy to do an automatic method, so i just change the size until i get a single output png)

>>61820502
>>61820566
this is very cool. I imagine if I automate the math I can make a simple script to convert music on demand. these are also images, not embedded music files. it's a game of semantics but not exactly against the rules(?)

Steganography is fun but ultimately pretty easy to detect. An image that contains hidden shit will either be unusually noisy or unusually big unless it only contains text.

>>61820613
>I imagine if I automate the math I can make a simple script to convert music on demand.
yes, it really would not be difficult to make even a bash script that turns any file into a png with an appropriate size automatically, just take any width, multiply that by the bpp (in bytes), then divide the filesize by that result, to get your height. pad the source to the next multiple of width*bpp(bytes) if you want to preserve the end of the file properly

>it's a game of semantics but not exactly against the rules(?)
it's against the spirit of the 4chan rule not to embed, but it could be argued that this isn't embedding, as this isn't "added to" or "alongside" image data, but rather the source file IS, solely, the image data

File: 1473021649318.png (996KB, 320x398px) Image search: [Google]

996KB, 320x398px

>>61820282
Thanks anon! Managed to get it done. What do you recommend reading to get a a good understanding for this type of steganography.

>>61821023
i wouldn't call this steganography, just using tools for unintended purposes
all this is is handing an image compressor data which describes something other than an image, abusing the fact that there's really no constraints on what constitutes an "image" (meant for human viewing)

File: 2017-08-10-065056_1920x1080_scrot.png (906KB, 1920x1080px) Image search: [Google]

906KB, 1920x1080px

>>61821143
>>61821023
to give an idea of how this really is just a matter of interpreting actual image pixels
here's a completely unmodified screenshot, taken with scrot

mpv <(convert 2017-08-10-065056_1920x1080_scrot.png -crop 1280x238+574+122 rgb:-)

all we're doing is cropping out the part we're interested in, and interpreting it as something other than pixels to be viewed

>>61810624
How about this for an idea?
Take an image with RGB 255 values and make each value of rach pixel correspond to an ASCII character.
You could have it run sequentially so a simple program could read each value from each pixel and get 3 ASCII characters from it.
You could easily hide a url to a CP image in less than 20 pixels

That's simple enough to encode messages.

>>61823187
This, except not each pixel. Pick random pixels based on a shared key.

>>61811548
"Error: image contains an embedded file."

I'm pissed too, lithursday and epub share threads were the fucking bomb.

>deep drive
>Can't be deleted
lmao, fucking /pol/tard larpers man.

File shredders, SUPER ADVANCED TECH GUYS.

>>61823247
>File shredders, SUPER ADVANCED TECH GUYS.
i get your point, but they don't work on SSDs

It'd be better to take reference images and then encode data as deltas of those images. Or better, webms, since they can be larger sizes without attracting suspicion. If the md5 or other checksum is used to indicate the reference, then only those with the same md5 would know how to decode it. A sort of encryption and "hashing" form. One could even start an image upload site for this, so if you're looking for a specific hash and/or size, you could find them quite readily.

>>61823304
They'll not need to since the data will be shit all over the NAND arrays when downloaded.
TRIM will deal with a large chunk of that sooner or later anyway. What might remain over a bunch of cells will be useless.

Also, who the FUCK runs a browser off an SSD in the first place?
You have RAM out the wazoo now. If you need ultra turbo mega deluxe speeds for your browser, either use a RAM Drive and copy browser there or symlink your cache to a RAM Drive.
Protip, you don't, it's a fucking browser.
Not even the biggest sites require SSDs to run faster. I can browse the damn things on a netbook perfectly fine. The only thing that matters is your processor. (because all web-tech is high-overhead as FUCK with regards to CPU-use)
Websites, luckily, are not shitty unoptimized-game tier yet. BAD, but still not THAT bad.

>>61813213
It wasn`t

4chan doesn`t allow posting of images inside images

File: 1501233517692.jpg (96KB, 1024x613px) Image search: [Google]

96KB, 1024x613px

>>61810624
>knowledge bomb
Into the trash it goes

>>61816406
the Democrat Party's gotta keep discipline somehow

>>61823546
literally what are screenshots

>>61823546
There were ways around it for years though. Not sure if there still are.

File: 1491487935009.png (1MB, 2048x171px) Image search: [Google]

1MB, 2048x171px

>>61815803
>>61815694
How did you guys open the images on windows mpv builds? It's fairly straight forward on linux but I haven't used cmd in years.

>>61823847
try powershell

>>61823231
That's what I was thinking:
Basically turn the first pixel into an index so you can have 1, 2, 3 scattered around randomly and a program can easily view the other values as characters.
The problem is that you have to ensure no other pixels have that same first value.

File: 1477400378293.png (480KB, 1024x1180px) Image search: [Google]

480KB, 1024x1180px

play me

>>61816206
this

File: 1472231537104.png (4MB, 1024x1180px) Image search: [Google]

4MB, 1024x1180px

>>61824153
one moar.

larp5 is in this thread talking about how you guys are all full of shit and trying to hide something

>>>/pol/136764800

>>61824153
this is sick, decoding instructions?

>>61824335
mpv <(convert out.png -alpha off rgb:-)

>>61824335
i made that one as well, just need to remove the alpha channel

mpv <(convert "https://i.4cdn.org/g/1502324461908.png" -alpha off rgb:-)

File: 1498720000691.jpg (8KB, 578x470px) Image search: [Google]

8KB, 578x470px

>>61824218

>>61816787
does it really ban you for posting images with embedded files? it used to just give an error.

File: I T S T O O L A T E.png (3MB, 1076x1105px) Image search: [Google]

3MB, 1076x1105px

Oh boy is this the 1337 thread?

I just hide it in the airwaves that hover near my computer. I have coded it so that it rotates the PSU at the right frequency to disturb the air. After enough time that air variations can be read back as data.

>>61824426
I personally use butterflies

>>61823976
>that same first value
What?
Use an PRNG seeded with a password. Filter duplicate values.

File: 1502298619725.jpg (17KB, 246x374px) Image search: [Google]

17KB, 246x374px

that alarmist-sounding fucko doesn't use or even know the commonly used term 'stenography' and the method sounds like vague, highly impractical and aimless way to blackmail most random people. well, what can you expect from /pol/.

File: stallman.gif (3MB, 2272x1704px) Image search: [Google]

3MB, 2272x1704px

Test for gif comments

>>61815997
Pls make a GUI for us pleb windbows users

>>61824560
Holy shit it works
Literally just gif comments, folks. Only works for up to 255 bytes though, I think you can have multiple

>>61824528
>that alarmist-sounding fucko doesn't use or even know the commonly used term 'stenography'
You mean steganography? Shithead?

>>61824607
english is not my first language i don't give a fuck

>>61815614
>best thread on /g/ is a /pol/ thread
A /pol/tard would say that huh

>>61824623
POO IN IT

>>61813213
Who else remembers that one program that would scramble the images up and take a password to fix amd a certain number of moves up/down/left/right?
What if someone used that technology to hide something within the picture?

>>61814165
Anyone play it yet?

>>61813872
FUCK I KNEW IT

File: a.png (585KB, 640x480px) Image search: [Google]

585KB, 640x480px

>>61825053
good old gmask

>>61813011
>>61813115
>>61813125
>>61813152

holy shit when was 15 i thought it was just a /b/ meme and used to spam the threads with pictures from google images

pretty funny knowing some pedos probably spent ages trying to decrypt regular images

>>61825423
myself as well.

I used to save pictures from those threads and repost too, what're the chances I used to share cp?

>>61813868
>>61813869
But GMask threads were pretty recent, like 2013 recent.

>>61813435
there still is,
there are pretty much undetectable methods, but can only store small files since it cant change the image too much, you can put links

and a simple method is to replace replace the end of a bmp with your archive, convert to png, and convert back to bmp to get it again.
its really obvious since its a big chunk of noise in the image.

>>61824560
how to view this one?

>>61810624
4chan filters image data that shouldn't be there, even metadata with names or stuf generated by programs like cameras. This is ancient shit and if you are a decent web dev into security you allways try to be up to date with this types of exploits so people don't get hacked by a fucking gifjar file for example.
That guy is larping

File: Capture.png (428KB, 490x580px) Image search: [Google]

428KB, 490x580px

>>61825417
a=aaah a-a s-spooky pedo shapeshifter

>>61816121
>not just saving and posting the thumbnail

>>61825751
>being this antly

>>61810820
>Tfw this used to do dumbass shit like this

Genuinely glad I'm normal again.

>foxacid posters
>13 year olds trying to get (you)s on >>>/pol/
>comes back with another one
>better worry about some nonsensical shitposting
instead of being a pussy bitch OP, go in hard without fear, thats how you break things

>>61825499
>4chan filters metadata
no

>>61825423
>>61825457
state of you

>>61825457
>>61825423
hello nonce

What a cool thread! It starts at CP and teaches me something I will never use, but still interesting.

>>61827566
>It starts at CP and teaches me something I will never use
welcome to the internet

>>61815904
?????
https://github.com/AlphaDelta/PNG-Mask/releases

Windows only btw

Who /DesuDesuTalk/ here?