PHP Encryption

Encryption is a process of converting data into a secret code so that any unauthorized person cannot access the original data without a decryption key. PHP provides various encryption methods for secure programming such as md5(), sha1(), blowfish, etc.

Syntax

encrypted_string = encryption_function(input_string,key);

Example

<?php
$input_string = "Hello World!";
$key = "t3$iKeY";

// Encrypt the string
$encrypted_string = openssl_encrypt($input_string, "AES-128-CBC", $key);

// Print the encrypted string
echo $encrypted_string;

// Decrypt the string
$decrypted_string = openssl_decrypt($encrypted_string, "AES-128-CBC", $key);

// Print the decrypted string
echo $decrypted_string;
?>

Output

BfzdNu1CrsltYd5gQbJL0g==
Hello World!

Explanation

In the above example, we have encrypted a string using the openssl_encrypt() function with the help of the Advanced Encryption Standard (AES) algorithm with 128-bit key in CBC (cipher block chaining) mode. We have used openssl_decrypt() function to decrypt the encrypted string using the same key.

Use

Encryption is used to protect sensitive information like passwords, credit card numbers, personal information, etc. while storing or transmitting. It ensures that only those who have the decryption key can access the original data.

Important Points

• Encryption must be used for sensitive data storage and transmission.
• The encryption and decryption must use the same key.
• There are various encryption algorithms and methods available in PHP, you should choose the one that best fits your needs.

Summary

PHP provides robust encryption methods that are commonly used to protect sensitive information while transmitting or storing the data. It is essential to follow the best practices and choose the best encryption method that suits your requirements.