Chaffing and Winnowing
An interesting paper by Ron Rivest about providing confidentiality without encryption.
Index of Cryptography Papers Available Online
A research tool for the cryptography community maintained by Counterpane Systems. Over 400 papers online.
Foundations of Cryptography
Oded Goldreich. A public domain book available on-line. Only partially completed.
Paul Garrett: Crypto and Number Theory
Lecture notes for a course on cryptography and number theory.
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