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A dumping ground for links.
These are mostly for my own use, but feel free to look around.
(provided without warranty or endorsment)
A Mathematician's Lament
, by Paul Lockhart
MathLinks EveryOne
A brief introduction to information theory
Erik Demaine
freshmeat.net: Project details for Tutorial Environment for Cryptographic Protocols
Mathpuzzle.com
Recreational Mathematics
Greg's Slide Rules
Mathematical Quotation Server
Substructural Logics
Cryptonomicon.Net
cryptogram
Security Engineering - A Guide to Building Dependable Distributed Systems
Security-Enhanced Linux
Penrose tiling - Wikipedia
The Geometry Junkyard: Penrose Tiling
Mandala
Penrose Tiles
Welcome to US-CERT
CERT Coordination Center
Katya's Homepage
The Joel on Software Forum - Ferocious Pirates and Technical Interviews
Random.org - True Random Number Service
Alan Turing - Home Page
Metamath Home Page
Reading list