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CAPTCHA: Distorted Code
Read a distorted 5-digit code rendered server-side as SVG and submit it
What you will learn
- Extract a distorted code from an image and type it back — the OCR step of captcha solving
- Verify the answer round-trips through the server, not a client check you could fake
- Reload to get a fresh challenge and confirm each one is independently verified
Distorted Code CAPTCHA
Read a 5-digit code rendered as a server-side 7-segment SVG — the plaintext value never appears as DOM text, so a bot must OCR the image (or, in practice mode, lift the leaked answer)
The code is drawn with SVG line segments and injected noise — there is no queryable text node to read. The correct value is sealed inside an HMAC token; the server recomputes and grades it on submit.
Your goal: type the 5 digits shown in the image and submit so the server returns verdict: human. Append ?mode=hard to the URL to withhold the practice hint.
Active mode: practice
Solve the Code
Enter the distorted digits
Testing Tips
Automation hints
- ✓ The code lives only in the
#captcha-imageSVG — there is no text node to read; inpracticemode lift it from#captcha-hintinstead - ✓ Drive
?mode=practiceso the API leaks the answer; reserve?mode=hardfor OCR / solver-service tests - ✓ Type into
#captcha-answer(5 chars max), then click#captcha-submit; use#captcha-reloadto fetch a fresh code - ✓ Assert on
#captcha-result[data-verdict=human], never on the image — the verdict is decided server-side - ✓ Each reload mints a new HMAC token; capture it per attempt and don't reuse a stale (or expired) one
