03-01-2022, 09:11 PM
(This post was last modified: 03-01-2022, 09:15 PM by Mark Knowles.)
(03-01-2022, 07:20 PM)R. Sale wrote: You are not allowed to view links. Register or Login to view.In all of these various examples, what sorts of techniques were used? Are they mainly substitution ciphers that differ in the uniqueness and complexity of their keys? Or are there also other techniques like anagramming or steganography or something else?Essentially, yes are right when you said "they mainly substitution ciphers that differ in the uniqueness and complexity of their keys". And there can be a pretty big difference between their complexity and definitely some which have really unique features.
The main problem I have with sharing these is that most examples that I have were obtained as photoreproductions from archives and unfortunately archives are very restrictive in how or whether you can share them with other people. When I write a paper or two on the subject I will have to get permission from the archives to include the very small number of images that I choose to include.