10-07-2026, 03:10 AM
(This post was last modified: 10-07-2026, 03:13 AM by Jorge_Stolfi.)
[quote="Mauro" pid='87368' dateline='1783632694']A You are not allowed to view links. Register or Login to view. is not a codebook cipher. The resulting encrypted text is a random string and gives zero informations to an attacker.[quote]
Ah, so you mean a Vigenère-type cipher. I though @JoJo was referring to a codebook-style cypher, namely a substitution cipher operating on words instead of characters. Even if the codebook is used once and then lost or discarded, if the text is long enough...
I think that a Vigenère-type cipher is rather unlikely because it would "homogenize" the word frequencies -- instead of a "most common word" there would be multiple equally common "most common words", etc. So it would have to be someting even more complicated than a simple Vigenère. Seems rather unlikely for the times...
All the best, --stolfi
Ah, so you mean a Vigenère-type cipher. I though @JoJo was referring to a codebook-style cypher, namely a substitution cipher operating on words instead of characters. Even if the codebook is used once and then lost or discarded, if the text is long enough...
I think that a Vigenère-type cipher is rather unlikely because it would "homogenize" the word frequencies -- instead of a "most common word" there would be multiple equally common "most common words", etc. So it would have to be someting even more complicated than a simple Vigenère. Seems rather unlikely for the times...
All the best, --stolfi