CODEWITHSUNDEEP
captchaverificationinteraction-design
Rog
Rog

Reputation: 17170

Captcha algorithm

I've notised that Stack Overflow only presents me with a captcha occasionally. Does anyone know if it has a good algorithm for sensing if I might be a robot or, instead if it's just random.

Reducing reliance on captchas is obviously a good thing.

Upvotes: 0

Views: 2158

Answers (4)

Copas
Copas

Reputation: 5952

I've never been confronted with a Captcha at SO because I used a google account and have not given it any reason to suspect me of being a bot I guess. If you don't create local logins you save yourself the trouble of Captcha and storing passwords.

EDIT I have now seen several captchas on the site, don't really have any idea what triggers them.

Upvotes: 1

Kirtan
Kirtan

Reputation: 21695

Stackoverflow.com uses reCAPTCHA. And, I too have noticed that when you try to edit the same question many times in a gap of a few seconds, it displays the captcha verification page.

Most of the CAPTCHA generation algorithms are strong enough. This article describes the factors influencing a CAPTCHA's strength.

Upvotes: 3

amrtn
amrtn

Reputation: 597

My impression is that SO monitors user's activity and presents captcha in case of suspicious beaviour, for example in case of frecuent posts or comments.

Upvotes: 2

victor hugo
victor hugo

Reputation: 35848

It appears when you post (or edit) the same entry or an entry in the same question many times. It had appeared to me when I edit twice in less than a minute

Upvotes: 1

Related Questions