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Sounds like it's gonna be something interesting, would love to check it out right away

I have so many such nice files that could be used as a secure file carrier that I don't know why I haven't used OPENPUFF yet :-).

So when I google it I get this:

OpenPuff is used primarily for anonymous asynchronous data sharing:

The advantage ... over cryptography alone, is that messages do not attract attention to themselves. Plainly visible encrypted messages ... arouse suspicion, and may ... be incriminating ...

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Therefore, whereas cryptography protects the contents of a message, steganography can be said to protect both messages and communicating parties.