Key Domain Of Affine Cipher
It is relatively secure than the above two as the key space is larger.
Key domain of affine cipher. The translation alphabet is determined by mapping each letter through the formula ax b mod m where m is the number of letters in the alphabet and a and b are the secret keys of the cipher. Now let s study about poly alphabetic cipher. The ciphertext alphabet for the affine cipher with key a 5 b 8.
The affine cipher is a type of monoalphabetic substitution cipher where each letter in an alphabet is mapped to its numeric equivalent encrypted using a simple mathematical function and converted back to a letter. Suppose x y a b z 26 decryption can be easily derived from encryption functions a x b equiv y mod 26 a x equiv y b mod 26 x equiv a 1 y b mod 26 the. For more information and implementation see affine cipher.
The size of the key domain is 26 12 312. The affine cipher uses a pair of keys in which the first key is from z 26 and the second is from z 26. In affine cipher each letter in an alphabet is mapped to its numeric equivalent encrypted using a simple mathematical function and converted back to a letter.
Example 3 10 3 28 3 2 1 continued. The affine cipher is a form of monoalphabetic substitution cipher. The formula used means that each letter encrypts to one other letter and back again meaning the cipher is essentially a standard substitution cipher with a rule governing which letter goes to which.
The size of the key domain is 26 12 312. The affine cipher uses a pair of keys in which the first key is from z 26 and the second is from z 26. The key space is 26 12 key space of additive key space of multiplicative i e.
Unicode lookup binary decoder integer converter trifid cipher decimal to text. Affine cipher the idea of affine cryptography is to multiply the plaintext by a part of the key and then add the rest of the key. Each letter is enciphe.