Character Segmentation for Automatic CAPTCHA Solving
نویسندگان
چکیده
منابع مشابه
Character Segmentation for Automatic CAPTCHA Solving
Many websites utilise CAPTCHA (Completely Automatic Public Turing tests to tell Computers and Humans Apart) schemes as human interaction proofs to grant access to their services only to people rather than spam bots. In this paper, we examine the security of six widely used types of CAPTCHA and present novel attacks against all of them, achieving success rates of up to 88%. We made improvements ...
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The cursive and ligature nature of the Arabic language make the segmentation of words into individual characters a difficult task. Despite attempts to apply methods for cursive Latin and other languages to Arabic, it is generally insufficient to segment Arabic text. This paper proposes a new segmentation algorithm for handwritten Arabic text and the main idea consist of segmenting the word into...
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CAPTCHAs exploit the gap in the ability between a human and a machine to understand the semantics of specific multimedia content, with vast applications in computer security. In this paper we compare two techniques in automated CAPTCHA solving for text-based CAPTCHA schemes, i.e., classification based on the Vector Space Model (VSM) versus a popular Optical Character Recognition (OCR) engine. F...
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Segmentation subdivides a CAPTCHA image into its constituent regions or objects. The point to which the subdivision is carried depends on the problem being solved. That is, segmentation should end when the objects of interest inan application have been isolated. Without a good segmentation algorithm, an object may never be identifiable. Image segmentation continues to be an vital and active res...
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CAPTCHAs are a standard security mechanism used on many websites to protect online services against abuse by automated programs, or bots. The purpose of a CAPTCHA is to distinguish whether an online transaction is being carried out by a human or a bot. Unfortunately, to date many existing CAPTCHA schemes have been found to be vulnerable to automated attacks. It is widely accepted that state-of-...
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ژورنال
عنوان ژورنال: Open Computer Science Journal
سال: 2014
ISSN: 2352-6270
DOI: 10.2174/2352627001401010001