Deniable file system
Some years ago I did some design work on something I called a Deniable File System. The basic idea was the fact that the existence of ciphertext can in itself be incriminating, regardless of whether or not anyone can decrypt it. I wanted to create a file system that was deniable: where encrypted files looked like random noise, and where it was impossible to prove either the existence or non-existence of encrypted files.
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