Key Domain Of Affine Cipher
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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.