Polyalphabetic substitution ciphers were invented by an artist, philosopher and scientist Leon Battista Alberti

. In 1467 he presented a device called the cipher disk. It provides polyalphabetic substitutions with mixed alphabets.

When was the Polyalphabetic ciphers invented?

The first polyalphabetic cipher was invented by the Italian author Leon Battista Alberti in the 15th century.

Why vigenere cipher is Polyalphabetic?

Vigenere Cipher is a method of encrypting alphabetic text. It uses a simple form of polyalphabetic substitution. A polyalphabetic cipher is any cipher based on substitution, using multiple substitution alphabets . ... At different points in the encryption process, the cipher uses a different alphabet from one of the rows.