"Cracking Codes with Python" shows how to make, test, and hack programs that encrypt text with classical ciphers like the
transposition cipher and Vigenere cipher.
The first stage processes the audio signal with
transposition cipher. While in the second stage Modulus Multiplication is used as substitution cipher, for this the key is generated using Pseudo RandomNumber Generation (PRNG) [9-11].
They also looked at the binary system and
transposition cipher to crack codes and competed against each other in teams.
2 This time we're using a
transposition cipher, where letters are re-arranged.
Breaking
Transposition Cipher with Genetic Algorithm // Electronics and Electrical Engineering.--Kaunas: Technologija, 2007.--No.
NSA presents a helpful glossary of code-breaker terms, such as "columnar
transposition cipher." Darrell and Shirley, two bomb-sniffing black Labs, direct the FBI's site.
In a
transposition cipher, the letters of the plaintext are rearranged into new patterns.
WHICH MEANS THE ANSWER IS: A bird in the hand is worth two in the bush 2 This time we're using a
transposition cipher, where letters are re-arranged.
Classical
Transposition Ciphers, Available from: http://www.cs.ubbcluj.ro/~florin/Si/Security/ccs3/lectures/less05.html Accessed: 2010-05-30