Learn how to implement a classic substitution cipher in C! This step-by-step tutorial walks you through encoding and decoding messages by replacing each letter with another according to a fixed key. A ...

A new study suggests the Voynich manuscript, written in an unknown script sometime in the 1400s, could be a type of encrypted message. Science journalist Michael Greshko created the 'Naibbe cipher', a ...

The Voynich manuscript—a mysterious medieval book that has defied translation for centuries—may have been created using a special code developed with the help of cards and dice, a new study suggests.

A match is played by two teams, each with a maximum of eleven players; one must be the goalkeeper. A match may not start or continue if either team has fewer than seven players. If a team has fewer ...

A 32-round symmetric Feistel structure A purely logical round function using AND, XOR, and fixed rotations S-box-free design for compact hardware realization On-the-fly round-key generation using an ...

Encrypts and decrypts text messages using shift or substitution keys. Includes test suites for verifying correctness. Command-line interface for interactive use.