Is there an open-source option for recaptcha? Not found anything out there.
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@zudn
But to answer the question, I don't think there's likely to be a good one. It'll either rely on large (not publically available) datasets, or a large enough userbase to generate that data, else it'll be easily reversable (and worthless for 'Telling Computers and Humans Apart').
To solve this problem, you need to think of something which is a one-way operation for computers, but humans can decode.
@everlastingrocks
Good morning!
Thanks, I'll pass this on. Doesn't look like there's a really good option, then?
We're setting up to receive subscriptions to an email newsletter, hence my interest.
@zudn
Here's one (simple, though closed source) example, which relies on a small dataset:
http://www.chip-community.org/index.php/Our_high-tech_anti-bot_captcha