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Donald
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This is an attempt to gather links to many of the useful posts already scattered around the Forum. I skipped short posts that only gave a useful detail or two in preference for longer posts that were more of a tutorial. I'm certain I missed a few important tutorials, so please feel free to add more links!

Walkthroughs and Tutorials on Cryptanalysis

rot13: General Strategies For Cryptanalysis

insecure: A walkthrough on how to crack a monosubstitution cipher
Donald: A different approach to breaking the same cipher
insecure: Short post on frequency analysis
rot13: How to use contact charts to help with difficult monosubstitution ciphers

Donald: Basic attacks on a Vigenere
insecure: Cracking a Vigenere by hand
Donald: Clarification on probable word attack method
rot13: A new and clever attack on the Vigenere cipher
insecure: An excellent tutorial on calculating Index Of Coincidence
rot13: A better way to calculate Index Of Coincidence
rot13: More details on the better way to calculate IOC
jdege: The Index Of Coincidence - The Chi Test, The Kappa
jdege: Cracking A Vig With Ic

rot13: Breaking a keyed transposition cipher
rot13: More on breaking a keyed transposition cipher

insecure: Basics on breaking a two time pad

rot13: Cracking a Grille cipher

Donald: Walkthrough on breaking a Playfair
Donald: some hints on playfair decryptions
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