[Cryptology] [The Cryptology Independent Study Project] The Codebreakers: Project 13.0

[The Cryptology Independent Study Project]

http://cryptology.dod.net/index.php?/archives/24-The-Codebreakers-Project-13.0.html

Read chapter thirteen, “Secrecy for Sale.”  This chapter is particularly interesting for the information it contains on different cipher machines, including router machines.  Note that 395-396 is basically the XOR cipher.  Do a close reading of pages 398-400 for the empirical and a priori proofs of why a one-time-pad system, with a truly random key stream, is completely secure.  Read pages 404-408 for a description of how the very first polygraphic crypto system is defined.  Also, pages 411-413 will describe the basic principals behind any router machine.  There are variations to this scheme like gear changes and cipher alphabets, but the basic principal still holds.  From 413-415 one can get a fairly good description of the process for solving router machines.  Takes about 1.75 hours to read.

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