The first cryptographic decoder, Colossus I was built by Alan Mathison Turing, Maxwell H.A. Newman, and T.H. Flowers at the Government Code and Cipher School (GC and CS) Center at Bletchley Park, near London, England in December 1943. It was used to decipher German military messages encrypted on the Enigma machine. The Colossus is sometimes cited as the first electronic computer, as it contained some mechanical systems.
Alan Mathison Turing
- Vigenère Cipher – Decoder, Encoder, Solver, Translator – dCode
Vigenere Decoder; Vigenere Encoder; How to encrypt using Vigenere cipher? … In order to cipher a text, take the first letter of the message and the first letter of …
- Caesar Cipher – Shift Cipher – Decoder, Encoder, Solver …
Caesar Cipher Decoder; Caesar Encoder; How to encrypt using Caesar cipher? …. The code was named after Julius Caesar who was born in 100 bc. the first …
- Cipher Tools – Rumkin.com
Keyed Caesar, Similar to a Caesar cipher, but you first alter the encoded … text so that only people who actually take the time to decode it can actually read it.
- History of cryptography – Wikipedia
Cryptography, the use of codes and ciphers to protect secrets, began thousands of years ago. …. In early medieval England between the years 800-1100, substitution ciphers were frequently used by scribes as a ….. attacks with finite resources with which to decode a message (practical secrecy, now computational security).
- Simple Substitution Cipher – Practical Cryptography
The simple substitution cipher is a cipher that has been in use for many … The first step is to calculate the frequency distribution of the letters in the cipher text.