I am interested, are there existing utilities/projects under way devoted to combining encryption and steganography.
I would like to
- combine two or more messages, encrypted with separate passwords, into a single output file - providing correct password will allow extracting the corresponding message only
- make sure it's not plausible to prove existence of other messages, unless I know passphrase(s) for some of those
I.e., the approach of TrueCrypt hidden volumes, somewhat expanded. Existing utilities like outguess can hide two messages in an image file - I am looking for more general approach.
Update. I disagree that the linked question has actually answers suitable for mine.
What I seek is a way to join several (two or more) messages, probably encrypted, into a data stream in a manner that cannot disclose the actual number of messages present, if any; and which can be decrypted to any of the message present, if correct passphrase is used.
None of tools known in lists such as this one can actually solve the task.