Data Encryption and Decryption Technical Guide for PHP and Mini Programs

Data Encryption and Decryption Technical Guide for PHP and Mini Programs

Introduction:
In the era of modern information exchange, data security has become particularly important. In order to protect sensitive information from unauthorized access and tampering, encryption and decryption technology have become essential tools. This article will introduce data encryption and decryption technologies commonly used in PHP and applets, and provide code examples.

1. Data encryption technology

1. Symmetric encryption
   Symmetric encryption means using the same key in the encryption and decryption processes. Commonly used symmetric encryption algorithms include DES, 3DES, AES, etc.
   In PHP, you can use the openssl_encrypt function for symmetric encryption. The example is as follows:

$plaintext = "Hello World";
$encryption_key = "123456789";
$iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length("AES-128-CBC"));

$ciphertext = openssl_encrypt($plaintext, "AES-128-CBC", $encryption_key, 0, $iv);

In the mini program, you can use the cryptojs library for symmetric encryption. The example is as follows:

var plaintext = "Hello World";
var encryption_key = "123456789";
var iv = CryptoJS.lib.WordArray.random(16);

var ciphertext = CryptoJS.AES.encrypt(plaintext, encryption_key, {
    iv: iv,
    mode: CryptoJS.mode.CBC,
});

2. Asymmetric encryption
   Asymmetric encryption refers to the use of different keys in the encryption and decryption processes. Commonly used asymmetric encryption algorithms are RSA.
   In PHP, you can use the openssl_seal function for asymmetric encryption. The example is as follows:

$plaintext = "Hello World";
openssl_public_encrypt($plaintext, $encrypted_data, $public_key);

In the applet, you can use the rsa encryption library for asymmetric encryption. The example is as follows:

var plaintext = "Hello World";
var encrypted_data = RSA.encrypt(plaintext, public_key);

2. Data decryption technology

1. Symmetric decryption
   Symmetric decryption and symmetric encryption use the same key to operate. The process of symmetric decryption is the opposite of symmetric encryption.
   In PHP, you can use the openssl_decrypt function for symmetric decryption. The example is as follows:

$decryption_key = "123456789";
$decrypted_data = openssl_decrypt($ciphertext, "AES-128-CBC", $decryption_key, 0, $iv);

In the mini program, you can use the cryptojs library for symmetric decryption. The example is as follows:

var decryption_key = "123456789";
var decrypted_data = CryptoJS.AES.decrypt(ciphertext, decryption_key, {
    iv: iv,
    mode: CryptoJS.mode.CBC,
}).toString(CryptoJS.enc.Utf8);

2. Asymmetric decryption
   Asymmetric decryption and asymmetric encryption operate using different keys. The process of asymmetric decryption is the opposite of asymmetric encryption.
   In PHP, you can use the openssl_private_decrypt function for asymmetric decryption. The example is as follows:

openssl_private_decrypt($encrypted_data, $decrypted_data, $private_key);

In the applet, you can use the rsa encryption library for asymmetric decryption. The example is as follows:

var decrypted_data = RSA.decrypt(encrypted_data, private_key);

Conclusion:
This article introduces data encryption and decryption technologies commonly used in PHP and small programs, including symmetric encryption, asymmetric encryption, etc. These encryption technologies help us protect the security of sensitive information and prevent data from being accessed and tampered with by unauthorized persons. By understanding and mastering these technologies, we can better protect users' privacy and data security.

Reference materials:

• PHP official documentation: https://www.php.net/manual/en/
• CryptoJS official documentation: https:// cryptojs.gitbook.io/docs/
• RSA encryption library: https://github.com/travist/jsencrypt

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