What methods can be used to securely store and transmit authentication tokens between an Android app and PHP server?

To securely store and transmit authentication tokens between an Android app and PHP server, you can use HTTPS for secure communication, encrypt the token before transmission, and store the token securely on the Android device using SharedPreferences or encrypted databases. 

// Sample PHP code for securely handling authentication tokens

// Generate a random token
$token = bin2hex(random_bytes(32));

// Encrypt the token before storing or transmitting
$encrypted_token = openssl_encrypt($token, 'AES-256-CBC', 'your_secret_key', 0, 'your_iv');

// Store the encrypted token in a database
// Example: $query = "INSERT INTO tokens (token) VALUES ('$encrypted_token')";
// Execute the query to store the token securely

// Decrypt the token when received from the Android app
$decrypted_token = openssl_decrypt($received_token, 'AES-256-CBC', 'your_secret_key', 0, 'your_iv');

// Compare the decrypted token with the stored token to authenticate the user
if ($decrypted_token === $stored_token) {
    // Authentication successful
} else {
    // Authentication failed
}

Keywords

JWT HTTPS SSL/TLS OAuth password hashing

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