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jevkray-captcha-v3 — moving-dot CAPTCHA
A CAPTCHA where a 4-digit code is drawn by the same dots that form the background noise. There is no separate text layer: the digits exist only as a group of dots moving as one rigid body (translation + slow rotation + breathing). Per-frame statistics (dot density, lifetime, spawn rate) are deliberately equalized, so a single frame carries almost no signal.
Goal of the public challenge: read the 4 digits from a single GIF with ≥ 50%
exact-match accuracy. The reference CV attack (generator/src/bin/solve.rs) scores 0/50.
Files
samples/— 6 GIFs with labels (labels.csv), plus sprite sheets (16 frames each) for tooling that cannot read animated GIFs.generator/— Rust source:capgen(the generator) andsolve.rs(reference attack). Build:cd generator && cargo build --release; usage:capgen <code> <out.gif> [fps] [seconds].
Notes for dataset users
datasets cannot decode animated GIFs, use Pillow/PyAV (Image.open(...).seek(frame)), or the
sprite sheets. The GIFs are 160×160, 20 fps, 30 s; the full field is 192×192 with a hidden margin.
License
Proprietary — research/testing allowed with attribution, commercial use requires permission. See the repository: https://github.com/Jevkray/jevkray-captcha-v3
Contacts
- ✉️ Email: krasovskyworks@gmail.com
- ✈️ Telegram: @eugenekray
- ☕ Boosty: boosty.to/jevkray
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