What encryption methods are recommended for protecting confidential documents on a PHP server?

To protect confidential documents on a PHP server, it is recommended to use strong encryption methods such as AES (Advanced Encryption Standard) or RSA (Rivest-Shamir-Adleman). These encryption algorithms provide secure ways to encrypt and decrypt data, ensuring that confidential documents are protected from unauthorized access. 

```php
// Example of encrypting a confidential document using AES encryption
$plaintext = "This is a confidential document.";
$key = openssl_random_pseudo_bytes(32); // Generate a random encryption key
$iv = openssl_random_pseudo_bytes(16); // Generate a random initialization vector

$ciphertext = openssl_encrypt($plaintext, 'AES-256-CBC', $key, 0, $iv);

// Store $ciphertext, $key, and $iv securely
```

Remember to securely store the encryption key and initialization vector to ensure that only authorized users can decrypt the confidential documents.

Keywords

encryption methods confidential documents PHP server security data protection

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