Question

How to use XOR Encryption (XOR Cipher) to encryption a string in C#

Answer 1

using System;

class Program
{
    public static string XOREncryption(string s, string key) {
    	int slen = s.Length, keylen = key.Length;
    	
    	char[] result = new char[slen];
    
    	for (int i = 0; i < slen; i++) {
    		result[i] = (char)(s[i] ^ key[i % keylen]);
    	}
    
    	return new string(result);
    }    
    static void Main() {
        string s = "C# is a general-purpose, multi-paradigm programming language";
        string key = "secretkey";
        
        string cipher = XOREncryption(s, key);
        Console.WriteLine(cipher);
        
        string noncipher = XOREncryption(cipher, key);
        Console.WriteLine(noncipher);
    }
}



/*
run:

0FCT
EFXK
_RK	
C# is a general-purpose, multi-paradigm programming language

*/

 

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