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Net) is a bad idea, as there are many failure modes.We recommend that you use a well-tested implementation such as re CAPTCHA.

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CAPTCHAs provide an effective mechanism to hide your email address from Web scrapers.Since a parser could easily be written that would allow bots to bypass this test, such "CAPTCHAs" rely on the fact that few sites use them, and thus that a bot author has no incentive to program their bot to solve that challenge.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 .CAPTCHA tests are based on open problems in artificial intelligence (AI): decoding images of distorted text, for instance, is well beyond the capabilities of modern computers.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). The idea is to require users to solve a CAPTCHA before showing your email address.

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.

re CAPTCHA also comes with an audio test to ensure that blind users can freely navigate your site. Instead of typing letters, you authenticate yourself as a human by recognizing what object is common in a set of images. Up until a few years ago, most of these services suffered from a specific type of attack: "bots" that would sign up for thousands of email accounts every minute.

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.

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.

Such CAPTCHAs may make a site incompatible with Section 508 in the United States.

Most CAPTCHA scripts found freely on the Web are vulnerable to these types of attacks. There are various "CAPTCHAs" that would be insecure if a significant number of sites started using them.