How to encrypt and decrypt data using PHP built-in functions?

Use PHP built-in functions for encryption and decryption: Encryption: Use the openssl_encrypt() function, specifying the algorithm (such as AES-256-cbc) and passphrase to encrypt the data. Decryption: Use the openssl_decrypt() function to decrypt the encrypted data using the same algorithm and passphrase. Hashing: Use the hash() function to create an irreversible hash value used to verify data integrity (such as SHA256).

How to securely encrypt and decrypt data using PHP built-in functions

Introduction

PHP provides powerful Built-in functions are used to encrypt and decrypt data, ensuring the security of sensitive information. This article will guide you on how to use these functions for encryption and decryption operations, and provide practical examples.

Encryption

<?php
$plaintext = "My secret message";
$encrypted_text = openssl_encrypt($plaintext, 'aes-256-cbc', 'secret_passphrase');
?>

This code will encrypt the plain text message using the AES-256 encryption algorithm and a secret passphrase and store it in $encrypted_text in variables.

Decryption

<?php
$decrypted_text = openssl_decrypt($encrypted_text, 'aes-256-cbc', 'secret_passphrase');
?>

Using the same encryption algorithm and secret passphrase, this code will decrypt the encrypted text and store it in the $decrypted_text variable.

Hash

For irreversible encryption operations, PHP provides a hash function:

<?php
$hash = hash('sha256', 'My secret message');
?>

will return a unique and irreversible hash value , can be used to verify data integrity.

Practical Case

In the following scenarios, using encryption and decryption functions can improve the security of the application:

• Store password: Encrypt and store user passwords in the database to prevent unauthorized access.
• Transmitting sensitive data: Encrypt sensitive information in network requests to prevent eavesdropping.
• Verify data integrity: Hash important data and store it in the database to check if the incoming data has changed.

Conclusion

PHP’s built-in encryption and decryption functions provide powerful tools for data security. By using these functions, you can ensure the confidentiality and integrity of sensitive information.

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