Reference library

Auth & security at scale

OAuth2, JWT, IAM patterns, secrets rotation, and least-privilege service auth.

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Auth & security at scale medium

AES GCM encryption and decryption in Python

Encrypt and decrypt data with AES-256-GCM using the cryptography library, including nonce generation and authenticated roundtrip verification.

aes-gcm cryptography encryption
Python 
import os
from cryptography.hazmat.primitives.ciphers.aead import AESGCM

def aes_gcm_demo():
    plaintext = b"confidential message"
    key = AESGCM.generate_key(bit_length=256)
    aesgcm = AESGCM(key)
    nonce = os.urandom(12)
    
    ciphertext = aesgcm.encrypt(nonce, plaintext, None)
    decrypted = aesgcm.dec…
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