Auth & security at scale
OAuth2, JWT, IAM patterns, secrets rotation, and least-privilege service auth.
How to Sign and Verify with Ed25519 in Python
A minimal Ed25519 sign-and-verify helper that generates a key pair, signs a message, and checks the signature with the cryptography library.
import hashlib
from cryptography.hazmat.primitives.asymmetric import ed25519
from cryptography.hazmat.primitives import serialization
def sign_verify_mock(
message: bytes,
private_key: ed25519.Ed25519PrivateKey,
public_key: ed25519.Ed25519PublicKey
) -> tuple[bool, bytes]:
signature = private_key.sign…How to mock DNS CAA record lookups in Python
Parse and filter DNS CAA records with a mock lookup function, demonstrating how certificate authorities validate domain authorization.
import dnslib
def parse_caa_record(record_string):
"""Parse a DNS CAA record string into its components."""
parts = record_string.split()
flags = int(parts[0])
tag = parts[1]
value = parts[2]
return flags, tag, value
def mock_caa_lookup(domain, caa_records):
"""Mock DNS CAA lookup that re…Browse by section
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Auth & security at scale — Python code examples
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