who invented keyword cipher
The VigenÃ¨re Cipher. The VigenÃ¨re cipher, was invented by a Frenchman, Blaise de VigenÃ¨re in the 16th century. It is a polyalphabetic cipher because it uses two or more cipher alphabets to encrypt the data. In other words, the letters in the VigenÃ¨re cipher are shifted by different amounts, normally done using a word or phrase as the encryption key .