The result was the polyalphabetic ciphers--a method which switched the encoding process of each letter throughout the message, so "A" might be replaced with "S" at one time and then with "R" later ...

5. The Renaissance: The Vigenère Cipher. The Renaissance period saw the development of more sophisticated encryption techniques. One of the most famous ciphers from this era was the Vigenère cipher, ...

“This cipher was first submitted to the FBI Laboratory on November 13, 1969, but not successfully decrypted,” the statement continued. ... transposition, or polyalphabetic substitution ...

L ate in the 1460s, Leon Battista Alberti wrote a book on ciphers. It was a dialogue between him and a longtime friend, Leonardo Dati, who had recently been made head of the papal secretariat. Like ...

Cipher Tool ($0.99 for iPhone) Have a secret message you want to send? For top-secret status or just to mess around with friends, ... One encryption type the application lets you use is a Vigenere ...

L ate in the 1460s, Leon Battista Alberti wrote a book on ciphers. It was a dialogue between him and a longtime friend, Leonardo Dati, who had recently been made head of the papal secretariat. Like ...

Last time I talked about complex polyalphabetic ciphers--techniques of encoding information that make it nearly impossible to reveal the message without access to a secret key.