yeo
command-line steganography application
designed to hide messages in jpg and png images without the requirement for any plain-text files.
uses aes256 on data, using an sha256 hash of the password as the encryption key.
rotates the password by 1 character, and uses an sha256 hash of that for the random seed for the image pointer access.
security and invisibility of data is currently being peer-reviewed (since ~2014). At this point it looks like no vulnerabilities have been identified yet.
this will evolve further, but remain...