A Challengers Handbook
This will almost certainly be the longest section and so I will split this chapter up:
Codes which considers simple encoding schemes - morse code, braille, semaphore, telephone codes, base64.
Simple Ciphers which considers caesar shift ciphers, pigpen, atbash.
Substition Ciphers which considers many methods of solving substitution ciphers.
Advanced Ciphers which considers some other ciphering methods and ways of attacking them.
Analysis Techniques which considers some simple techniques when faced with an unknown cipher.
If you're interested in some more tutorials and solved problems then grab these. Some time ago I started to write a more comprehensive version of the handbook and these were for inclusion, but as with everything in life it never got finished so I decided to put them up here anyway.
For further reading I will recommend:
Helen Fouche Gaines - Cryptanalysis published by Dover, ISBN 0-486-20097-3. This book is excellent, and has the added benefit of being extremely cheap.
Lanakis lessons are interesting although they tend to be a bit short and try to cover a lot.
If you are interested in the history of cryptography then the definitive text is Kahn.
For source code and details of modern block ciphers - DES, etc then Bruce Schneirs Applied Cryptography book is best known.
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