npm package · MIT · v2 · zero deps
passglyph
Hieroglyphs instead of dots. Matching passwords, matching glyphs.
passglyph v2 replaces the masking dots inside your password fields with Egyptian hieroglyphs. If the confirmation matches, both fields show the same sequence; a typo changes every glyph from the first wrong character on. Each glyph comes from a keyed hash of the whole prefix with a fresh per-page key, so nothing about the characters is revealed, and repeated letters don't repeat glyphs. The input stays type="password".
npm i passglyph
Live demo
| Alphabet | 32 hieroglyphs |
|---|---|
| A typo slips past one position | 1 in 32 |
| …past every later position (10 chars) | 1 in 1015 |
| Leak to a screenshot (no key) | 0 bits |
| If the key were stolen too | 5 bits per position |
With 5 bits a single mistyped position is caught 31 times out of 32, and the following positions almost always differ as well. The glyphs reveal nothing without the per-page key, which is non-extractable and never leaves memory.
Threat model, briefly
- No character-to-glyph mapping. Glyph i = HMAC-SHA-256(key, password[0..i]) truncated to 4–6 bits. Identical characters don't give identical glyphs, and a mismatch shows from the first wrong position on.
- Fresh 128-bit key per form from
crypto.getRandomValues, imported as a non-extractable WebCrypto key. The raw bytes are wiped, so a screenshot or recording is meaningless in any other session. - Honest leak: a recording gives about b bits per position under that session's key. That's useless without the key, but with it, prefix hashing lets an attacker recover the password one character at a time (about 95 guesses per position). The key never leaves memory, and an attacker with memory access can read the field anyway.
- Typo position is visible: the sequences diverge exactly where you mistyped. That's the point, and it's documented.
- No extra length or timing leak: one glyph per character, exactly like the dots, redrawn in one frame per input with no animation.
- Canvas only. No code points, glyph names or derived bits in the DOM. The snapshot is identical for any two passwords. Overlays are
aria-hidden, and a live region says "Passwords match". - Real input untouched: it stays
type="password", so autofill, password managers, mobile keyboards and screen readers keep working. It falls back to dots if anything is unsupported.
Not a strength meter, and no help against keyloggers or malicious scripts on the page. Full write-up: SECURITY-DESIGN.md · launch post.
Usage
// Vanilla (inline hieroglyphs by default)
import { attach } from 'passglyph';
const detach = attach(pw, confirm);// v1 badge mode
attach(pw, confirm, { mode: 'badge' });<!-- Web component -->
<pass-glyph>
<input type="password"> <input type="password">
</pass-glyph>// React / Vue
usePassGlyph(pwRef, confirmRef, { bits: 5 });Support this project
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