Caesar Cipher

Caesar Encoder/Decoder

Encrypt and decrypt instantly with custom shift values (including ROT presets like ROT13). Options typically include handling spaces, punctuation, and numbers.

Auto-Cracker / Frequency Analysis

Try all shifts automatically, score likely plaintexts, and visualize why simple substitution is insecure.

Interactive Cipher Wheel

A visual alphabet ring to show wrap-around and letter mapping, perfect for classroom demos.

Examples & Snippets

Copy-ready code and walkthroughs for implementing Caesar and related ciphers.

Learn Library (Growing)

Articles, history notes, practice problems, and references spanning monoalphabetic and polyalphabetic families.

Classroom & Workshops

Live-demo encoding, decoding, and cracking; connect modular arithmetic (mod 26) to real outputs.

Self-Study & Exam Prep

Start with Caesar, then deepen via tutorials, exercises, and comparisons to other classical ciphers.

Puzzles & Games

Design challenges with Caesar/ROT variants and verify solvability using the auto-cracker.

Programming Exercises

Implement encoders/decoders, compare brute-force approaches, and benchmark key-space searches.

Historical Context

Contrast classical substitutions with modern cryptography to understand why the former is educational, not secure.