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The Trouble with CAPTCHA
By: Bruce Coker
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    Table of Contents:
  • The Trouble with CAPTCHA
  • Alternatives to CAPTCHA
  • More Alternatives

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    The Trouble with CAPTCHA - More Alternatives

    (Page 4 of 4 )

    A number of other CAPTCHA alternatives have also been explored. These include animation-based systems as shown in these examples, and multiple-choice systems in which the user is asked to complete sentences by selecting the correct word from a drop-down list.

    Non-CAPTCHA solutions may also have some value. One such is the inclusion of dummy form elements. This is an interesting approach, as it turns the traditional method of actively trying to identify the legitimate user on its head, seeking to identify the bot instead. It does so by attempting to trick the bot into completing part of a form that human users are asked to ignore: any authentication attempt that includes a response to the dummy element is rejected.

    As long as there is value to spammers and advertisers in gaining access to accounts on social sites, the next method of breaking any new authentication system will be just around the corner. Nonetheless, although it is unlikely that any perfect system can be devised for distinguishing humans from automated systems, each of the approaches outlined here can provide part of the solution to this challenging problem.

    In the ongoing battle to maintain a quality service for legitimate users while denying access to those wishing to exploit sites for their own ends, innovations such as these are welcome and necessary alternatives in the armory of site developers and hosts.

    DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware.


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