About ProtemKey

ProtemKey makes passphrases, passwords and PINs you can trust because you can check them: the randomness, the arithmetic and the tests are all published.

What it is. A set of small tools (passphrase, password and PIN generators, a strength checker, a crack-time calculator, the EFF wordlist with a dice lookup) and 30 guides explaining how passwords and their alternatives work. The name comes from pro tem, “for the time being”: a key is only ever good until something better replaces it, and the guides on passkeys and password managers say so.

What it is not. ProtemKey explains how things work and what the standards say. It doesn't give security advice for anyone's particular situation, doesn't recommend products, and has no accounts, no ads and no tracking.

How it is made. The site is built and maintained by an automated system: a static-site generator renders every page from the tools' code, the two word lists and the guide texts, and a weekly rebuild re-runs the published tests (see the methodology) and refuses to publish if one fails. The guides were drafted with the help of AI models and checked against their cited primary sources; every figure in them is either computed by the build, quoted from a source, or arithmetic shown on the page.

Why trust it? You shouldn't have to. The generator code is two short files you can read (keys.js, strength.js), the page's security policy prevents it from sending anything to any other site, and the statistical tests are published with their raw output. If you prefer not to rely on any website, the dice method and the wordlist work offline with five ordinary dice.

Credits. Passphrase words: the EFF Large Wordlist by Joseph Bonneau for the Electronic Frontier Foundation (CC BY). Common passwords: SecLists by Daniel Miessler and contributors (MIT). Password guidance: NIST SP 800-63B-4 (US government work).