Question

How to use XOR Encryption (XOR Cipher) to encrypt a string in C++

Answer 1

#include <iostream>

static std::string XOREncryption(std::string s, std::string key) {
	int slen = s.size();
	int keyLen = key.size();
	
	std::string result = s;

	for (int i = 0; i < slen; i++) {
		result[i] = s[i] ^ key[i % keyLen];
	}

	return result;
}

int main() {
    std::string s = "C++ is a general-purpose programming language";
    std::string key = "secretkey";
    
    std::string cipher = XOREncryption(s, key);
    std::cout << cipher << "\n";
    
    std::string noncipher = XOREncryption(cipher, key);
    std::cout << noncipher << "\n";
    
    return 0;
}




/*
run:

0NHRKY
H	KS	

C++ is a general-purpose programming language

*/

 

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