Search results
Results from the WOW.Com Content Network
In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code, or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet .
Alphabet shift ciphers are believed to have been used by Julius Caesar over 2,000 years ago. [6] This is an example with k = 3.In other words, the letters in the alphabet are shifted three in one direction to encrypt and three in the other direction to decrypt.
A message encoded with this type of encryption could be decoded with a fixed number on the Caesar cipher. [4] Around 800 AD, Arab mathematician Al-Kindi developed the technique of frequency analysis – which was an attempt to crack ciphers systematically, including the Caesar cipher. [3]
ROT13 is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the Latin alphabet. ROT13 is a special case of the Caesar cipher which was developed in ancient Rome, used by Julius Caesar in the 1st century BC. [1] An early entry on the Timeline of cryptography.
Private-key cryptosystems use the same key for encryption and decryption. Caesar cipher; ... use a public key for encryption and a private key for decryption.
A secret decoder ring (or secret decoder) is a device that allows one to decode a simple substitution cipher—or to encrypt a message by working in the opposite direction. [ 1 ] As inexpensive toys, secret decoders have often been used as promotional items by retailers, as well as radio and television programs, from the 1930s through to the ...
British SOE agents initially used 'poem ciphers' (memorized poems were the encryption/decryption keys), but later in the War, they began to switch to one-time pads. The VIC cipher (used at least until 1957 in connection with Rudolf Abel 's NY spy ring) was a very complex hand cipher, and is claimed to be the most complicated known to have been ...
The Caesar cipher is an Affine cipher with a = 1 since the encrypting function simply reduces to a linear ... In this example showing encryption and decryption, the ...