In the Vigenere cipher, unlike in Ceasar cipher, the displacement involved for each character is different. The sequence of displacement is decided by a keyword, which is known to both the ...

Giovan Battista Bellaso, a 16th-century cryptologist, designed the Vigenere cipher (falsely attributed to diplomat Blaise de Vigenere), believed to be the first cipher that used an encryption key.

The aim of this paper is to trace the development of cipher-writing from the very simple devices of the Ancients to the so-called Chiffre Indéchiffrable, generally called the Vigenère Cipher. The ...