Tokens, passwords & IDs
Technical guides about tokens, passwords & ids, written for practical follow-up.
Guides in this topic
5 articlesJWT validation: signatures, claims and the key you actually trust
Work through a token-verification decision using issuer, audience, expiry and an independently trusted key.
Password breach checks: what a range query can tell you
Understand hash prefixes, padded responses and corpus limits, then choose a practical response to a match.
UUIDv4 identifiers: randomness, collisions and validation
Read the version and variant bits, estimate collision risk responsibly and keep identifiers separate from access control.
Generate passwords around a password-manager workflow
Choose length and character rules with an explicit threat model, then handle storage, recovery and service restrictions.
Design random tokens with enough entropy and a clear expiry
Convert a byte budget into encoded length, store verifiers safely and plan single-use and revocation behaviour.
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5 guides