What are some common pitfalls to avoid when working with encryption and decryption in PHP?

One common pitfall to avoid when working with encryption and decryption in PHP is using insecure encryption algorithms or weak key lengths. It is important to use strong encryption algorithms like AES with appropriate key lengths to ensure the security of your data. 

// Avoid using insecure encryption algorithms or weak key lengths
$plaintext = "Hello, world!";
$key = openssl_random_pseudo_bytes(32); // Generate a secure random key
$iv = openssl_random_pseudo_bytes(16); // Generate a secure random IV

$ciphertext = openssl_encrypt($plaintext, 'aes-256-cbc', $key, OPENSSL_RAW_DATA, $iv);

$decrypted = openssl_decrypt($ciphertext, 'aes-256-cbc', $key, OPENSSL_RAW_DATA, $iv);

echo $decrypted; // Output: Hello, world!

Keywords

encryption decryption PHP security vulnerabilities cryptography

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