Telling humans and computers apart automatically
نویسندگان
چکیده
منابع مشابه
Remotely Telling Humans and Computers Apart: An Unsolved Problem
The ability to tell humans and computers apart is imperative to protect many services from misuse and abuse. For this purpose, tests called CAPTCHAs or HIPs have been designed and put into production. Recent history shows that most (if not all) can be broken given enough time and commercial interest: CAPTCHA design seems to be a much more difficult problem than previously thought. The assumptio...
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Completely Automated Public Turing Test to tell Computers and Humans Apart (CAPTCHA) is a –rather– simple test that can be easily answered by a human but extremely difficult to be answered by computers. CAPTCHAs have been widely used for practical security reasons, like preventing automated registration in Web-based services. However, all deployed CAPTCHAs are based on the static identification...
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We consider the problem of distinguishing between two arbitrary black-box distributions defined over the domain [n], given access to s samples from both. It is known that in the worst case Õ(n) samples is both necessary and sufficient, provided that the distributions have L1 difference of at least ε. However, it is also known that in many cases fewer samples suffice. We identify a new parameter...
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This paper is concerned with the identification of two semantically close categories – temporal locating adverbials and time-denoting expressions. The dividing line between these categories is difficult to draw, inasmuch as there are several phrases that occur with the same surface form in the typical contexts of both of them (e.g. in adverbial position and as the complement of verbs like to da...
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Land plants underpin a multitude of ecosystem functions, support human livelihoods and represent a critically important component of terrestrial biodiversity-yet many tens of thousands of species await discovery, and plant identification remains a substantial challenge, especially where material is juvenile, fragmented or processed. In this opinion article, we tackle two main topics. Firstly, w...
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ژورنال
عنوان ژورنال: Communications of the ACM
سال: 2004
ISSN: 0001-0782,1557-7317
DOI: 10.1145/966389.966390