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In your use case, you can never actually achieve deniability, unless Bob is a competent programmer. To read the book, Bob must decrypt it somehow, but using what? If he uses a program, then the mere existence of the program will announce clearly to any attacker that deniable encryption is in use, thus making it impossible for Bob to deny hiding something. ...


I agree that these 2 requirements seem contradictory: fast incremental backups, and secure (host-proof) off-site backups. However, the rsyncrypto documentation specifically points out those specific contradictory requirements: Sometimes it is necessary to store files on a remote server. This is typically needed for backup purposes. When that is done, ...

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