In the winter of 54 BCE, a javelin flew into a besieged Roman camp in Gaul with a letter tied to it. The camp was commanded by Quintus Tullius Cicero, brother of the famous orator, and enemy forces ...

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

This is an explanation of the Cryptography challenge 'New Caesar' from CyLab Security Academy (formerly picoCTF). You are provided with a short ciphertext and the single Python script that created it.

One thing that is no surprise is that phishing continues to be an ongoing threat to consumers and organizations alike. No longer are these the simplistic “you’ve won the Canadian lottery” or “I’m a ...

plaintext AND to decrypt a ciphertext. That is four operations, and most resources show one. Every sheet here does all four. 8-bit ASCII code is given, and so is the one-time pad’s; the student poses ...