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Intelligent System and Knowledge Engineering, 2008. ISKE 2008. 3rd International Conference on In Intelligent System and Knowledge Engineering, 2008. ISKE 2008. 3rd International Conference on, Vol. 1 (2008), pp. 205-210.

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Nowadays, a great amount of information is circulated through the Internet. Some of them exclusively belongs to a special group of users and requires protection and safeguarding against unauthorized access. To this end, a category of systems called HIP (human interactive proof) have been introduced to distinguish between various groups of users.


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