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comment Is it feasible to break an encrypted and later encoded message?
@CodesInChaos How is decoding the message trivial, if the substitution table is unknown? There are potentially infinite (well, not really) substitution tables - there are 2! substitution tables which map one bit to another, 4! tables mapping two bits to another two bits, and so on - not counting tables that map n bits to n+k bits. For long encrypted messages, it seems nontrivial to me to test all possible substitution tables.
Jan
28
asked Is it feasible to break an encrypted and later encoded message?