How can developers ensure the secure transmission of encrypted data between PHP and JavaScript?

Developers can ensure the secure transmission of encrypted data between PHP and JavaScript by using HTTPS protocol for communication, implementing strong encryption algorithms, and securely storing encryption keys. They can also use libraries like OpenSSL in PHP to encrypt data before sending it to JavaScript. 

// Encrypt data in PHP using OpenSSL
$data = "Sensitive information";
$key = openssl_random_pseudo_bytes(32);
$iv = openssl_random_pseudo_bytes(16);
$encrypted = openssl_encrypt($data, 'AES-256-CBC', $key, 0, $iv);

// Send encrypted data to JavaScript
echo json_encode(array(
    'data' => base64_encode($encrypted),
    'key' => base64_encode($key),
    'iv' => base64_encode($iv)
));

Keywords

SSL HTTPS encryption secure communication data transmission

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