Hill Cipher Program Source Code

• Hill Cipher Program
• Hill Cipher Program Source Code In C
• Hill Cipher Program In Java

C++ implementation of 2x2 Hill cipher; Author: CPallini. Mw3 mod tool ps3 download. Encrypt and Decrypt using 2x2 Hill Cipher. Along with any associated source code and files.

Hill cipher is a polygraphic substitution cipher based on linear algebra.Each letter is represented by a number modulo 26. Often the simple scheme A = 0, B = 1, …, Z = 25 is used, but this is not an essential feature of the cipher. To encrypt a message, each block of n letters (considered as an n-component vector) is multiplied by an invertible n × n matrix, against modulus 26. To decrypt the message, each block is multiplied by the inverse of the matrix used for encryption.

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The matrix used for encryption is the cipher key, and it should be chosen randomly from the set of invertible n × n matrices (modulo 26).

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Hill Cipher Program

Examples:

Encryption

We have to encrypt the message ‘ACT’ (n=3).The key is ‘GYBNQKURP’ which can be written as the nxn matrix:
The message ‘ACT’ is written as vector:
The enciphered vector is given as:
which corresponds to ciphertext of ‘POH’

Hill Cipher Program Source Code In C

Decryption

Hill Cipher Program In Java

To decrypt the message, we turn the ciphertext back into a vector, then simply multiply by the inverse matrix of the key matrix (IFKVIVVMI in letters).The inverse of the matrix used in the previous example is:
For the previous Ciphertext ‘POH’:
which gives us back ‘ACT’.
Assume that all the alphabets are in upper case.
Below is the the implementation of the above idea for n=3.

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