Is it possible to encrypt a single folder/file on a USB without

http://lmgtfy.com/?q=opensource+encrypt+folder

But if you can't even do that yourself, you'll most likely just somehow corrupt your files.

>>127248
you can just winrar the file with hidden files+password

it's almost impossible to crack with a good password

>>127316
How about 7zip?

>>127316
This.
The other option would be to use something like truecrypt and creating an encrypted virtual drive (it would be a file in the USB drive).
>>127324
Works just as well.

>>127324
>>127325
this, plus you can even change the file extension type afterwards to something random like .inf or .txt to make make it obvious at glance that you're trying to hide something. But even if they find out it's an archive, it would take years of brute forcing passwords to crack the file if you choose a good password

>>127335
to not make it obvious* sorry typo

veracrypt or some other truecrypt successor

encrypted archives are not a good idea if you want to use files inside them; it will write the file on the disk without encryption.
you can use a memdrive though