Could one of you with programming skills please help me out?
doranchak? Jarlve?
I have no way of generating test ciphers automatically and want to test an idea out.
A plain text is encoded with this exact repeating 19 digit shift string. Then subsequently encoded with homophonic substitution.
19 digit key
09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09
example: T H I S I S T H E Z O D I A C S P E A K I N G 20 08 09 19 09 19 20 08 05 26 15 04 09 01 03 19 16 05 01 11 09 14 07 +09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 =29 39 36 38 49 49 38 27 21 46 31 23 27 31 43 38 43 36 10 20 40 41 26 %26 =03 13 10 12 23 23 12 01 21 20 05 23 01 05 17 12 17 10 10 20 14 15 26 C M J L W W L A U T E W A E Q L Q J J T N O Z 340 shift values (before homophonic substitution) 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27 31 09 09 31 27 19 40 30 18 19 16 20 16 19 18 30 40 19 27
I know the homophonic substitution step would change the stats but
it seems like this would show a bigram spike at p19 and maybe even the reversed p15?
Could one of you guys generate some test ciphers with this and random symbol assignments for the homophonic part? (Or however you guys normally decide to when you make test ciphers)
Could you also include in the plain text a few words that have around a 4% repetition rate throughout the whole plain text?
Any help would be much appreciated!
Hey Jelberg,
Without testing I can empirically say that something like a vigenère does not increase bigram repeats at the keyword period. Rather, it diffuses bigram repeats of the plain text period, and the longer the keyword the higher the diffusion.
