Alberti cipher disc,artwork

Numéro d’image : 11904556
Alberti cipher disc,artwork
Alberti cipher disc,artwork. This device was described in 1467 by the Italian cryptographer Leon Battista Alberti (1404-1472). The inner ring of lower-case letters is on a moveable disc that is rotated past the outer ring of upper-case letters and numbers. The position of the discs is determined by key letters included in the encoded message itself. Each ring has 24 characters. The outer ring is used for the uncoded message (the plaintext),and the inner ring is the corresponding letter in the coded message (the ciphertext). This is known as polyalphabetic substitution. The four numbers are used to encode references to phrases in a codebook
Licence : Droits gérés
Crédit: Science Photo Library
Taille de l’image : 4200 px × 4200 px
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Property Release : Non requis
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