My name is Daniel.
Mz pdqj oz Ljxtqy.

It starts with a simple alphabet cipher, with the key set at A=A, but changes key by 1 character after each letter in the sentence.

M = m
y = yz

n = nop
a = abcd
m = mnopq
e = efghij

i = ijklmno
s = stuvwxyz

d = defghijkl
a = abcdefghij
n = nopqrstuvwx
i = ijklmnopqrst
e = efghijklmnopq
l = lmnopqrstuvwxy

By the time you get to the 26th letter, it just goes back to A=A, and restarts key shifting by 1. Super confusing to read or decipher. In all my research into the history of codes, I’ve never heard of a code where the key was not static. This seems like it would be a major advantage against decoding techniques like letter frequency.

Below is a Jefferson Lock. It’s more like a bike lock than a cipher, but you can see how the principle can work.


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