Caesar Cipher: A Secret in Plain Sight
Why the world's easiest cipher to break is still the perfect place to start learning.
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Explore the world of cryptology
From classical shifts and reciprocal rotations to Base32, Morse code, and frequency analysis, read clear guides on the history, logic, mathematics, and weaknesses behind ciphers, encodings, and signalling systems.
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11 articles
The ROT13 Cipher: Thirteen Steps to Obscurity
A thirteen-letter rotation that hides text from casual view but offers almost no real protection.
A1Z26 Cipher: The Mechanics of Simple Substitution
How replacing letters with their alphabet positions teaches symbolic transformation, reversibility, and the limits of simple secrecy.
Hill Cipher: The Day Classical Cryptography Became Mathematical
How Lester S. Hill's 1929 matrix cipher moved secret writing beyond alphabet tricks and toward the logic of modern cryptography.
Vigenère Cipher: When Classical Cryptography Learned to Change Alphabets
How a repeating keyword lets classical cryptography rotate among several alphabets instead of relying on one fixed substitution.
ADFGX and ADFGVX: Fracturing Letters for Wartime Radio
The World War I field ciphers that split characters into coordinates, scattered those coordinates across the page, and made intercepted radio traffic far harder to analyse at speed.
Morse Code: The Moment Messages Escaped the Horse
How dots, dashes, and disciplined timing helped build the first electric language of the modern world.
Base64: The Encoding That Smuggles Binary Through Text
How a simple 6-bit alphabet became one of the quiet workhorses of email, the web, APIs, certificates, tokens, and modern software plumbing.
Base32: The Encoding That Makes Binary Easier to Read, Copy, and Survive
How a 5-bit alphabet became a quiet helper in authenticator apps, DNS-safe strings, recovery codes, identifiers, and text-shaped software systems.
Frequency Analysis: The Statistical Fingerprint That Broke Classical Ciphers
How counting letters turned cryptanalysis from educated guesswork into a science, and why weak ciphers still betray themselves through the shape of language.
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