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The Culper Code Book
The Culper Code Book was used during The American Revolutionary War in 1778 by George Washington's Culper Spy Ring. Developed by Ben Tallmadge, it consisted of 763 numerical codes to represent various words, names, and locations. This code book was…
Confederate Cipher Disk
The Confederate Cipher Disk was used in The American Civil War by the Confederate Army. Created by Francis LaBarre and based on the Vigenère Cipher, it consisted of two brass discs with the alphabet on each. As a mechanical cipher tool, it allowed…
Giddings Field Message Book
The Giddings Field Message Book was used in 1898 during the Spanish-American War. Designed by Major Howard A. Giddings of the Brigadier Signal Officer Office of the Connecticut National Guard, it composed of a pocket pad with a built in US Army…
Vigenère Cipher
The Vigenère cipher was created in the 16th-century by French cryptographer Blaise de Vigenère. It was revered as "le chiffre indéchiffrable" or "the unbreakable cipher" for many years after its invention.
It works by concealing the original…
It works by concealing the original…
Tags: Vigenere Cipher
Playfair Cipher
The Playfair Cipher was created in 1854 by Charles Wheatstone, and named after Lord Playfair for promoting its use. Initially, it was rejected by the British Foreign Office for appearing complicated. Later, the military began to use it for being…
Tags: Playfair Cipher
Caesar Cipher
The Caesar Cipher is one of the oldest ciphers, used by Julius Caesar to communicate with his generals. It works by shifting the alphabet down by a fixed number, or key. Due to the simplicity, it can be broken if the crypanalyst knows that a simple…
Tags: Caesar Cipher, Greek