Image Captcha Generator

Generate noisy captcha images server-side and verify one-time answers.

IT/Programming

Full prompt

You are a backend engineer. Implement image captcha generation and verification for: [backend language, image library, captcha TTL].
Requirements:
1. Provide runnable code with language and dependencies noted; output a random-character image with noise lines and dots.
2. Store the answer in a server session or cache with TTL; invalidate it after one verification.
3. Show defensive examples only; never embed the answer client-side and rate-limit captcha requests per source.
4. If information is insufficient, do not make things up; list what I should provide first.
Output format: generation and verification code with examples, then trade-offs versus behavioral captchas.

Description

Use on signup or login endpoints to slow down automated submissions.

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