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True CAPTCHAs should be secure even after a significant number of websites adopt them. In general, making your own CAPTCHA script (e.g., using PHP, Perl or .Net) is a bad idea, as there are many failure modes.Therefore, CAPTCHAs also offer well-defined challenges for the AI community, and induce security researchers, as well as otherwise malicious programmers, to work on advancing the field of AI. Using Machine Learning to Break Human Interaction Proofs (HIPs). CAPTCHAs are thus a win-win situation: either a CAPTCHA is not broken and there is a way to differentiate humans from computers, or the CAPTCHA is broken and an AI problem is solved. (2) Systems where a solution to the same CAPTCHA can be used multiple times (this makes the CAPTCHA vulnerable to so-called "replay attacks").

The following guidelines are strongly recommended for any CAPTCHA code: Accessibility. CAPTCHAs based solely on reading text — or other visual-perception tasks — prevent visually impaired users from accessing the protected resource.

A free and secure implementation that uses CAPTCHAs to obfuscate an email address can be found at re CAPTCHA Mail Hide. In November 1999, an online poll asking which was the best graduate school in computer science (a dangerous question to ask over the web! As is the case with most online polls, IP addresses of voters were recorded in order to prevent single users from voting more than once.

However, students at Carnegie Mellon found a way to stuff the ballots using programs that voted for CMU thousands of times. The next day, students at MIT wrote their own program and the poll became a contest between voting "bots." MIT finished with 21,156 votes, Carnegie Mellon with 21,032 and every other school with less than 1,000. Not unless the poll ensures that only humans can vote. CAPTCHAs can also be used to prevent dictionary attacks in password systems.

re CAPTCHA is our officially recommended CAPTCHA implementation. This was the first example of a CAPTCHA based on image recognition. Most bloggers are familiar with programs that submit bogus comments, usually for the purpose of raising search engine ranks of some website (e.g., "buy penny stocks here"). By using a CAPTCHA, only humans can enter comments on a blog. The solution to this problem was to use CAPTCHAs to ensure that only humans obtain free accounts.

There is no need to make users sign up before they enter a comment, and no legitimate comments are ever lost! In general, free services should be protected with a CAPTCHA in order to prevent abuse by automated scripts. Spammers crawl the Web in search of email addresses posted in clear text.

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An example of such a puzzle is asking text-based questions, such as a mathematical question ("what is 1 1").

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