Introduction to ciphers and substitution. Alice and Bob and Carl and Julius: terminology and Caesar Cipher ; The key to the ...

One thing that is no surprise is that phishing continues to be an ongoing threat to consumers and organizations alike. No longer ...

Cryptography is nearly as old as human language. Many civilizations felt the need to conceal their messages using more or less ...

1. Introduction -- 2. From Julius Caesar to simple substitution -- 3. Polyalphabetic systems -- 4. Jigsaw ciphers -- 5.