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Auth & security at scale

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

5 matches

ECDH key agreement in Python with cryptography

Simulate ECDH key exchange between Alice and Bob, derive a shared secret, and generate a symmetric key with HKDF using the cryptography library.

ecdh cryptography key-agreement

Python

from cryptography.hazmat.primitives.asymmetric import ec
from cryptography.hazmat.primitives import serialization, hashes
from cryptography.hazmat.primitives.kdf.hkdf import HKDF

def ecdh_mock():
    # Alice generates her key pair
    alice_private = ec.generate_private_key(ec.SECP256R1())
    alice_public = alice_pr…

15 0 Open

Auth & security at scale medium

How to Implement a CSRF Token Double Submit Mock in Python

A mock CSRF protection class that generates and validates double-submit tokens using HMAC-SHA256 with a secret key.

csrf security hmac

Python

import hmac
import hashlib
import secrets


class CSRFProtection:
    def __init__(self, secret_key: str):
        self.secret_key = secret_key.encode("utf-8")

    def generate_token(self) -> str:
        random_value = secrets.token_hex(16)
        signature = hmac.new(
            self.secret_key, random_value.enco…

13 0 Open

Auth & security at scale medium

How to Implement a Vault Dynamic Database Credentials Mock in Python

A Python dataclass-based mock of HashiCorp Vault that issues short-lived database credentials, tracks leases, and revokes them, demonstrating dynamic secrets rotation.

vault secrets database

Python

import time
import json
from dataclasses import dataclass, field
from typing import Dict


@dataclass
class DynamicCredential:
    username: str
    password: str
    lease_duration: int
    created_at: float = field(default_factory=time.time)

    def is_valid(self) -> bool:
        return time.time() - self.created_…

16 0 Open

Auth & security at scale medium

How to Mock Environment Variables in Python for 12-Factor Config

Read 12-factor config from env vars and test/mock them with unittest.mock.patch.dict without touching the real environment.

environment-variables 12-factor testing

Python

import os
import json
from unittest.mock import patch

def load_config(env_prefix="APP"):
    """Read 12-factor style config from env vars"""
    required = ["DATABASE_URL", "API_KEY"]
    optional = {"PORT": "8080", "DEBUG": "false"}
    
    config = {}
    for key in required:
        full_key = f"{env_prefix}_{key…

13 0 Open

Auth & security at scale medium

How to redact secrets from log messages in Python

This code defines a logging.Filter subclass that automatically redacts sensitive keys like password, token, and API key from any dict logged.

logging security redaction

Python

import logging
from dataclasses import dataclass


@dataclass
class ApiResponse:
    status: int
    body: dict


class SecretRedactor(logging.Filter):
    SENSITIVE_KEYS = {"password", "token", "secret", "api_key"}

    def filter(self, record: logging.LogRecord) -> bool:
        if isinstance(record.msg, dict):
    …

12 0 Open

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