Errata for Invitation to Cryptology

Further Errata for Invitation to Cryptology

Replacement Table of Primes for pages 370-372 of Invitation to Cryptology

The Code Book by Simon Singh

Basic Cryptography from the US Army Field Manual

The Military Telegraph Service, by A.W. Greely

Decrypting Texts - Codebreaking Software: Very useful Java applets written to decipher encrypted text or encipher plaintext.

Vigenère deciphering tool

Breaking the Vigenère Encryption System

Cryptogram solving tool

Cryptogram Helper

Affine Cipher Calculator

Online Jefferson Wheel Cipher

Mafia Boss's Encrypted Messages Deciphered

Navajo Code Talkers in World War II

National Security Agency's Center for Cryptologic History

Multiplication and Division of Binary Numbers Calculator

Binary-Decimal-ASCII-Hexadecimal converter

ASCII Codes

ASCII from Wikipedia

An overview of Babylonian mathematics

Babylonian Numerals

Greek Number Systems

Great Internet Mersenne Prime Search

The Prime Pages

Largest Known Prime by Year: A Brief History

Digits of 2^43112609-1: This 16.73 MB file lists the digits of the largest known prime number (as of August 2008).

What is the Difference Between 40-bit and 128-bit Encryption?

Announcement of 2006 Gödel Prize

International PGP Home Page

NSA WWII Historical Documents

The Enigma in Action Video

Java Applet for Fast Modular Exponentiation

Online Cryptology Resources from MBA Online