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Vigenère cipher
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The Vigenère cipher is a method of encrypting alphabetic text where each letter of the plaintext is encoded with a different Caesar cipher, whose increment is determined by the corresponding letter of
The Vigenère cipher is named after Blaise de Vigenère (pictured), although Giovan Battista Bellaso had invented it before Vigenère described his autokey cipher.
The Vigenère cipher is named after Blaise de Vigenère (pictured), although Giovan Battista Bellaso had invented it before Vigenère described his autok
Cryptographic slide rule used as a calculation aid by the Swiss Army between 1914 and 1940
Cryptographic slide rule used as a calculation aid by the Swiss Army between 1914 and 1940
Confederate cipher wheel, captured at the surrender of Mobile, Alabama, in May 1865 – National Cryptologic Museum
Confederate cipher wheel, captured at the surrender of Mobile, Alabama, in May 1865 – National Cryptologic Museum
Cipher disk
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A cipher disk is an enciphering and deciphering tool developed in 1470 by the Italian architect and author Leon Battista Alberti. He constructed a device, consisting of two concentric circular plates
Vigenère cipher
…its present name. The very first well-documented description of a polyalphabetic cipher was by Leon Battista Alberti around 1467 and used a metal cipher disk to switch between cipher alphabets. Alberti's system only switched alphabets after several words, and switches were indicated by writing the letter of…
A metal cipher disk
A metal cipher disk
Reconstruction of an Aeneas cipher disk, 5th century BC, Thessaloniki Science Center and Technology Museum
Reconstruction of an Aeneas cipher disk, 5th century BC, Thessaloniki Science Center and Technology Museum
Modern representation of the Union Cipher Disk, from the American Civil War, which was 3.75 inches (95 mm) in diameter and made of light yellow heavy
Modern representation of the Union Cipher Disk, from the American Civil War, which was 3.75 inches (95 mm) in diameter and made of light yellow heavy card stock. It consisted of two concentric disks of unequal size revolving on a central pivot. The disks were divided along their outer edges into 30 equal compartments. The smaller inner disk contained letters, terminations and word pauses, while the outer disk contained groups of signal numbers. For easier recognition, the number eight represented two. The initials A.J.M. represent the Chief Signal Officer General