Vigenere Cipher [Over 500 Years Old!]

The Vigenere Cipher was first described by Giovan Battista Bellaso in his 1553 book La cifra del Sig Giovan Battista Bellaso, but the scheme was later misattributed to Blaise de Vigenere in the 19th century The Vigenere cipher is simple substitution cipher that relies on a keyword The Vigenere cipher was used by both the Union and Confederacy during the American Civil War The Vigenere cipher was used by the German Army during World War I The Vigenere cipher was broken by the British cryptanalyst Alan Turing in 1939 The Vigenere cipher is a type of polyalphabetic substitution cipher that is used to encrypt and decrypt messages The Vigenere cipher uses a keyword to generate a key, which is then used to encrypt the message The Vigenere cipher is considered to be more secure than other types of substitution ciphers, as it is more difficult to break The Vigenere cipher has been used since the 16th century and is still in use today The idea behind the Vigenere cipher, like all other polyalphabetic ciphers, is to disguise the plaintext letter frequency The primary weakness of the Vigenere cipher is the repeating nature of its key If a cryptanalyst correctly guesses the key's length “n”, the cipher text can be treated as “n” interleaved Caesar ciphers, which can easily be broken individually The key length may be discovered by brute force testing each possible value of n The Kasiski examination and the Friedman test can help to determine the key length ***** Vigenere cipher,Vigenere cipher,encryption (literature subject),cipher (literature subject),cryptology,cryptography and network security,cipher codes,cypher codes,cryptology mathematics,cryptology navy,cryptology 101,Vigenere cipher tutorial,Vigenere cipher explained,Vigenere cipher decoder with key,Vigenere cipher decoder,Vigenere cipher frequency analysis,Vigenere cipher example,code breaking,Vigenere cipher - decryption (unknown key)