Affine cipher decryption tool code#
Using the Python programming language, the following code can be used to create an encrypted alphabet using the Roman letters A through Z. Some classical/modern ciphers in C language and Python to encrypt and decrypt important information and keep the information safe, such as integrity, authentication, confidentiality and availability of the data. In this example, the one to one map would be the following: To make encrypting and decrypting quicker, the entire alphabet can be encrypted to create a one to one map between the letters of the cleartext and the ciphertext.
Affine cipher decryption tool mod#
The encryption function looks like this: f (x) ax+b mod m f ( x) a x + b mod m x.
The monoalphabetic cipher family has one very important feature, namely one letter of the open alphabet corresponds to exactly one letter of the secret alphabet. Only the value of has a restriction since it has to be coprime with 26. An affine cipher is a cipher belonging to the group of monoalphabetic substitution ciphers. The possible values that could be are 1, 3, 5, 7, 9, 11, 15, 17. It then uses modular arithmetic to transform the integer that each plaintext letter corresponds to into another integer that correspond to a ciphertext letter. C a string of ciphertext possibly an empty string. This key must be an element of (ZZ/nZZ times ZZ/nZZ) such that (gcd(a,n) 1) with (n) being the size of the ciphertext and plaintext spaces. INPUT: a, b a secret key belonging to the key space of this affine cipher. Only the value of has a restriction since it has to be coprime with 26. Affine Cipher In the affine cipher the letters of an alphabet of size m are first mapped to the integers in the range 0.m - 1. Decrypt the ciphertext C with the key (a, b) using affine cipher decryption.
Below is the table with the final step completed. In this encrypting example, the plaintext to be encrypted is 'AFFINE CIPHER' using the table mentioned above for the numeric values of each letter, taking to be 5, to be 8, and to be 26 since there are 26 characters in the alphabet being used. In this encrypting example, the plaintext to be encrypted is 'AFFINE CIPHER' using the table mentioned above for the numeric values of each letter, taking to be 5, to be 8, and to be 26 since there are 26 characters in the alphabet being used. The plaintext in this decryption is AFFINECIPHER. The final step in decrypting the ciphertext is to use the table to convert numeric values back into letters. The following table shows the results of both computations. In the affine cipher the letters of an alphabet of size m, and then take the remainder when that result is divided by 26.
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