Re: Seriation

Seriation is not a cipher, it is a technique used to build ciphers. Like substitution and permutation, of which it is a form of the latter.
It can be useful eg with digram-based ciphers like Playfair, where it makes cryptanalysis based on the known frequency of occurrence of digrams in the plaintext language much harder or impossible.
Peter Fairbrother
On 07/12/2024 15:27, Stefan Claas wrote:

$ echo "Hello sci.crypt community. This is a test with seriation." | seriation
Preprocessed text in lines:
 HELLOSCICRYPTCOMMUNIT
YTHISISATESTWITHSERIA
TI
ON
 Seriation:
 HY ET LH LI OS SI CS IA CT RE YS PT TW CI OT MH MS UE NR II TA
TO IN
 Seriation was used in the German WWII cipher Doppelkastenschlüssel
and I thought it is pretty cool. However, I did not managed yet to
understand how encryption and decryption works.