Re:If your cipher were secure, this image wouldn't have repe...
by numpad0 on Saturday February 29, 2020 @09:10AM
(#22450617)
I thought the notion of OTP is that there is absolutely nothing to decode, prove or disprove ciphertext?
Like if ciphertext is "supersecret" then it feels like plaintext can't be more obvious and OTP must be "00000000000", but there's nothing anywhere to logically/mathematically support it. OTP could be something else and plaintext could be "hackernews" or "ycombinato".
In reality a simple XOR with a random sequence preserve enough entropy of data that I've heard you could make out voices if used on media, so payloads must be scrambled, but that's not recovery, only a guess. ANY reuse breaks that notion and make it not an OTP cryptography.
Like if ciphertext is "supersecret" then it feels like plaintext can't be more obvious and OTP must be "00000000000", but there's nothing anywhere to logically/mathematically support it. OTP could be something else and plaintext could be "hackernews" or "ycombinato".
In reality a simple XOR with a random sequence preserve enough entropy of data that I've heard you could make out voices if used on media, so payloads must be scrambled, but that's not recovery, only a guess. ANY reuse breaks that notion and make it not an OTP cryptography.