Data encryption and decryption using JavaScript

In the era of network information, data security has become an issue that all walks of life must pay serious attention to and pay attention to. Data encryption technology plays a vital role in the field of data security, which can effectively protect users' sensitive information and ensure that data is not accessed and stolen by unauthorized persons. This article introduces how to use JavaScript to implement data encryption and decryption to ensure data security.

1. Overview of data encryption technology

Data encryption refers to converting original data through a certain algorithm so that the converted data cannot be directly read and understood. The data can only be decrypted using a specific key, thus protecting the confidentiality and security of the data.

Common data encryption algorithms include symmetric encryption algorithms and asymmetric encryption algorithms.

Symmetric encryption algorithm refers to an algorithm that uses the same key for encryption and decryption. Common symmetric encryption algorithms include DES, 3DES, AES, etc.

Asymmetric encryption algorithm refers to an algorithm that uses different keys for encryption and decryption. Common asymmetric encryption algorithms include RSA, DSA, etc.

In order to achieve secure transmission of data, a hybrid encryption mechanism is often used in practical applications, that is, an asymmetric encryption algorithm is used to transmit a symmetric key, and then a symmetric encryption algorithm is used to encrypt the message data.

2. Use JavaScript to implement data encryption

In Web development, JavaScript is a common programming language that can run on the client, so we can implement data encryption functions through JavaScript.

In JavaScript, we can use CryptoJS to implement standard data encryption and decryption. CryptoJS is an encryption library written in pure JavaScript, which supports various encryption and hashing algorithms, including AES, DES, SHA1, SHA256, etc.

1. Use AES algorithm to encrypt data

When using CryptoJS for AES encryption, you first need to introduce CryptoJS into the page and then use the API functions it provides to encrypt the data. and decryption.

The following code demonstrates how to use CryptoJS for AES encryption:

<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.9-1/crypto-js.min.js"></script>

<script>
// 加密数据
function encryptByAES(message, keyStr) {

  var key = CryptoJS.enc.Utf8.parse(keyStr);

  var encryptedData = CryptoJS.AES.encrypt(message, key, {
    mode: CryptoJS.mode.ECB,
    padding: CryptoJS.pad.Pkcs7
  });

  return encryptedData.toString();
}

// 解密数据
function decryptByAES(ciphertext, keyStr) {

  var key = CryptoJS.enc.Utf8.parse(keyStr);

  var decrypt = CryptoJS.AES.decrypt(ciphertext, key, {
    mode: CryptoJS.mode.ECB,
    padding: CryptoJS.pad.Pkcs7
  });

  return decrypt.toString(CryptoJS.enc.Utf8);
}

// 测试代码
var myMessage = "Hello World!";
var myKey = "1234567890123456";

var ciphertext = encryptByAES(myMessage, myKey);
console.log("加密后的数据：" + ciphertext);

var plaintext = decryptByAES(ciphertext, myKey);
console.log("解密后的数据：" + plaintext);
</script>

In the above code, we use the functions provided by CryptoJS to implement AES encryption and decryption, where the mode value indicates the encryption mode and padding The value indicates the padding method.

2. Use RSA algorithm to encrypt data

When using CryptoJS for RSA encryption, you need to generate an RSA key pair first, then use the public key to encrypt the data, and use the private key to encrypt the data. key to decrypt the data.

The following code demonstrates how to use CryptoJS for RSA encryption:

<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.9-1/crypto-js.min.js"></script>

<script>
// 生成RSA密钥对
var keyPair = CryptoJS.lib.CipherParams.create({
  ciphertext: CryptoJS.enc.Hex.parse("<public key>")
});

// 加密数据
function encryptByRSA(message, publicKey) {

  var key = CryptoJS.lib.CipherParams.create({
    ciphertext: CryptoJS.enc.Hex.parse(publicKey)
  });

  var encryptedData = CryptoJS.AES.encrypt(message, key, {
    mode: CryptoJS.mode.ECB
  });

  return encryptedData.toString();
}

// 解密数据
function decryptByRSA(ciphertext, privateKey) {

  var key = CryptoJS.lib.CipherParams.create({
    ciphertext: CryptoJS.enc.Hex.parse(privateKey)
  });

  var decrypt = CryptoJS.AES.decrypt(ciphertext, key, {
    mode: CryptoJS.mode.ECB
  });

  return decrypt.toString(CryptoJS.enc.Utf8);
}

// 测试代码
var myMessage = "Hello World!";
var myPublicKey = "<public key>";
var myPrivateKey = "<private key>";

var ciphertext = encryptByRSA(myMessage, myPublicKey);
console.log("加密后的数据：" + ciphertext);

var plaintext = decryptByRSA(ciphertext, myPrivateKey);
console.log("解密后的数据：" + plaintext);
</script>

In the above code, we first generated an RSA key pair, and used the public key to encrypt the data and the private key to Decrypt data.

3. Conclusion

This article introduces how to use JavaScript to implement data encryption and decryption, protect users' sensitive information through encryption, and ensure data security. We can use CryptoJS library to implement different encryption and decryption algorithms such as AES, RSA, etc. In order to protect the security of data, we should widely use encryption technology in web applications to protect user privacy and data security.

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