10-07-2026, 09:42 AM
[quote="Jorge_Stolfi" pid='87381' dateline='1783649445']
[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
[/quote]
Not necessarily complicated (and not comparable to the Visener), but simply redundant. In the case of the Visener, we can apply the key and quickly get the text, but according to my version, the VMS cipher does not have mathematical rigor, and it does not have any specific algorithm, encryption could be done manually.
[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
[/quote]
Not necessarily complicated (and not comparable to the Visener), but simply redundant. In the case of the Visener, we can apply the key and quickly get the text, but according to my version, the VMS cipher does not have mathematical rigor, and it does not have any specific algorithm, encryption could be done manually.