atbash_cipher.cpp File Reference

Atbash Cipher implementation More...

#include <cassert>
#include <iostream>
#include <map>
#include <string>

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Namespaces
namespace	ciphers
	Algorithms for encryption and decryption.
namespace	atbash
	Functions for the Atbash Cipher implementation.

Functions
std::string	ciphers::atbash::atbash_cipher (const std::string &text)
	atbash cipher encryption and decryption
static void	test ()
	Self-test implementations.
int	main ()
	Main function.

Variables
std::map< char, char >	ciphers::atbash::atbash_cipher_map

Detailed Description

Atbash Cipher implementation

The Atbash cipher is a subsitution cipher where the letters of the alphabet are in reverse. For example, A is replaced with Z, B is replaced with Y, etc.

Algorithm

The algorithm takes a string, and looks up the corresponding reversed letter for each letter in the word and replaces it. Spaces are ignored and case is preserved.

Author

Focusucof

Function Documentation

atbash_cipher()

std::string ciphers::atbash::atbash_cipher

(

const std::string &

text

)

atbash cipher encryption and decryption

Parameters

text	Plaintext to be encrypted

Returns

encoded or decoded string

                                               {
    std::string result;
    for (char letter : text) {
        result += atbash_cipher_map[letter];
    }
    return result;
}

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main()

int main

(

void

)

Main function.

Returns

0 on exit

           {
    test();  // run self-test implementations
    return 0;
}

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test()

static void test ( )

static

Self-test implementations.

Returns

void

                   {
    // 1st test
    std::string text = "Hello World";
    std::string expected = "Svool Dliow";
    std::string encrypted_text = ciphers::atbash::atbash_cipher(text);
    std::string decrypted_text = ciphers::atbash::atbash_cipher(encrypted_text);
    assert(expected == encrypted_text);
    assert(text == decrypted_text);
    std::cout << "Original text: " << text << std::endl;
    std::cout << ", Expected text: " << expected << std::endl;
    std::cout << ", Encrypted text: " << encrypted_text << std::endl;
    std::cout << ", Decrypted text: " << decrypted_text << std::endl;
    std::cout << "\nAll tests have successfully passed!\n";
}

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Variable Documentation

atbash_cipher_map

std::map<char, char> ciphers::atbash::atbash_cipher_map

Initial value:

= {
    {'a', 'z'}, {'b', 'y'}, {'c', 'x'}, {'d', 'w'}, {'e', 'v'}, {'f', 'u'},
    {'g', 't'}, {'h', 's'}, {'i', 'r'}, {'j', 'q'}, {'k', 'p'}, {'l', 'o'},
    {'m', 'n'}, {'n', 'm'}, {'o', 'l'}, {'p', 'k'}, {'q', 'j'}, {'r', 'i'},
    {'s', 'h'}, {'t', 'g'}, {'u', 'f'}, {'v', 'e'}, {'w', 'd'}, {'x', 'c'},
    {'y', 'b'}, {'z', 'a'}, {'A', 'Z'}, {'B', 'Y'}, {'C', 'X'}, {'D', 'W'},
    {'E', 'V'}, {'F', 'U'}, {'G', 'T'}, {'H', 'S'}, {'I', 'R'}, {'J', 'Q'},
    {'K', 'P'}, {'L', 'O'}, {'M', 'N'}, {'N', 'M'}, {'O', 'L'}, {'P', 'K'},
    {'Q', 'J'}, {'R', 'I'}, {'S', 'H'}, {'T', 'G'}, {'U', 'F'}, {'V', 'E'},
    {'W', 'D'}, {'X', 'C'}, {'Y', 'B'}, {'Z', 'A'}, {' ', ' '}
 
}

                                       {
    {'a', 'z'}, {'b', 'y'}, {'c', 'x'}, {'d', 'w'}, {'e', 'v'}, {'f', 'u'},
    {'g', 't'}, {'h', 's'}, {'i', 'r'}, {'j', 'q'}, {'k', 'p'}, {'l', 'o'},
    {'m', 'n'}, {'n', 'm'}, {'o', 'l'}, {'p', 'k'}, {'q', 'j'}, {'r', 'i'},
    {'s', 'h'}, {'t', 'g'}, {'u', 'f'}, {'v', 'e'}, {'w', 'd'}, {'x', 'c'},
    {'y', 'b'}, {'z', 'a'}, {'A', 'Z'}, {'B', 'Y'}, {'C', 'X'}, {'D', 'W'},
    {'E', 'V'}, {'F', 'U'}, {'G', 'T'}, {'H', 'S'}, {'I', 'R'}, {'J', 'Q'},
    {'K', 'P'}, {'L', 'O'}, {'M', 'N'}, {'N', 'M'}, {'O', 'L'}, {'P', 'K'},
    {'Q', 'J'}, {'R', 'I'}, {'S', 'H'}, {'T', 'G'}, {'U', 'F'}, {'V', 'E'},
    {'W', 'D'}, {'X', 'C'}, {'Y', 'B'}, {'Z', 'A'}, {' ', ' '}
 
};