Some useful and interesting links:
- International Association for Cryptology Research (IACR)
 - Cryptology ePrint Archive
 - ECRYPT – Network of Excellence in Cryptology
 
Crypto libraries (and projects):
- The GNU Multiple Precision Arithmetic Library (GMP)
 - The Pairing-Based Cryptography Library (PBC)
 - The OpenSSL Project
 - Victor Shoup’s NTL
 
Lecture notes and Books available on the net:
- A computational introduction to Number Theory and Algebra by Victor Shoup
 - Introduction to Modern Cryptography by Mihir Bellare and Phillip Rogaway
 - Lecture notes on Cryptography by Mihir Bellare and Shafi Goldwasser