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Artificially synthesized sentences are used for malicious purposes such as unsolicited commercial junk submission to Web site. We study a problem to distinguish between natural and synthesized messages generated in Markov chains and show experimental results. Based on the difficulties of the problem, we consider a new application to CAPTCHA, a type of challenge-response test used in computing to ensure...
This paper studies a synthesis of password to be easily identified and hardly forgot. A new synthesis method is proposed to construct a good passwords that satisfy both requirements. Our method focuses on the change of frequency of combined words. Each of two words has a high term frequency but the combination is not quite common and then the frequency of the combined words can give strong impression...
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