How do you perform server-side file encryption in PHP?

Hey there, PHP developers! If you’re working with sensitive information and need to ensure its security, you may be wondering about server-side file encryption. Encrypting files on the server is a great way to protect sensitive information and prevent unauthorized access. In this blog post, I’ll be discussing how you can perform server-side file encryption in PHP.

One popular method for server-side file encryption in PHP is using the Mcrypt extension. Mcrypt provides a range of symmetric block algorithms such as AES, Blowfish, and more. To use Mcrypt, you’ll first need to install it on your server.

Here’s an example of how you can use Mcrypt to encrypt a file:


// Load the Mcrypt extension
if (!extension_loaded('mcrypt')) {
    die('Mcrypt extension not loaded');

// Open the plaintext file
$plaintext = file_get_contents('plaintext.txt');

// Encrypt the plaintext using AES-256 encryption
$td = mcrypt_module_open(MCRYPT_RIJNDAEL_256, '', MCRYPT_MODE_CBC, '');
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_DEV_URANDOM);
mcrypt_generic_init($td, 'encryptionkey', $iv);
$ciphertext = mcrypt_generic($td, $plaintext);

// Write the encrypted data to a file
file_put_contents('ciphertext.bin', $iv . $ciphertext);


In this example, the plaintext file is encrypted using AES-256 encryption, which is a strong encryption algorithm. The encryption key and initialization vector (IV) are also generated for you.

It’s important to note that encryption is only one aspect of ensuring the security of sensitive information. You should also take measures to secure your server, such as using strong passwords, keeping your server software up to date, and using firewalls to prevent unauthorized access.

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