Simple implementation of javascript reversible encryption algorithm - xor exclusive OR operation

With the rise of e-commerce, network security has attracted more and more attention. When data is transmitted over the network, it is often necessary to encrypt the data in order to protect the confidentiality of the data. JavaScript can be used as a very important network programming language. As an intermediary for transmitting data, confidentiality is crucial. This article will introduce one of JavaScript's reversible encryption algorithms-XOR operation.

XOR operation is a logical operation. Its output result is the comparison of two input values. When the two values ​​are different, it outputs 1, otherwise it outputs 0. The symbol for XOR operation is ^.

In JavaScript, you can use XOR operations to implement simple encryption and decryption. Perform a bitwise XOR operation on a set of keys used for encryption and the plaintext value to be encrypted, and the result is the ciphertext. Similarly, the original plaintext data can be obtained by performing a bitwise XOR operation on the key and ciphertext.

The following is the algorithm implementation of JavaScript XOR encryption:

function xor_encrypt(data, key) {
    var result = '';
    for(var i = 0; i < data.length; i++) {
        result += String.fromCharCode(data[i] ^ key.charCodeAt(i % key.length));
    }
    return result;
}

function xor_decrypt(data, key) {
    var result = '';
    for(var i = 0; i < data.length; i++) {
        result += String.fromCharCode(data[i] ^ key.charCodeAt(i % key.length));
    }
    return result;
}

The above code is simple and easy to understand. First, the data is encrypted through the incoming plaintext and key, and the plaintext and key are encrypted bit by bit. XOR operation, the result is saved in the result string. The decryption operation is the same. The ciphertext and key are XORed bitwise, and the result is saved in the result string.

In order to better understand the implementation of the above algorithm, let's implement a simple sample program:

var data = 'Hello World!';
var key = 'password';

var encrypted = xor_encrypt(data, key);
var decrypted = xor_decrypt(encrypted, key);

console.log('明文：' + data);
console.log('密钥：' + key);
console.log('密文：' + encrypted);
console.log('解密后的明文：' + decrypted);

Run the above program, you will get the following output:

明文：Hello World!
密钥：password
密文：jVyooRMa/^a_
解密后的明文：Hello World!

Through the above In the sample program, we can see that the data encrypted by the XOR operation has become garbled, but after the decryption operation, we can get the original plaintext data. This achieves a simple and reliable encryption algorithm.

Of course, encryption and decryption algorithms implemented using XOR operations are not absolutely secure and are only suitable for some simple data encryption scenarios. If there are scenarios with higher security requirements, more complex encryption algorithms need to be used. .

In short, JavaScript's XOR operation is a simple and effective encryption algorithm that can easily implement encryption and decryption operations, but there is no guarantee that it will not be cracked in the future. In actual scenarios, selection and application must be made based on specific circumstances.

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