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Download Applied Cryptography and Network Security: 10th by Feng Hao, Dylan Clarke (auth.), Feng Bao, Pierangela PDF

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By Feng Hao, Dylan Clarke (auth.), Feng Bao, Pierangela Samarati, Jianying Zhou (eds.)

This ebook constitutes the refereed court cases of the tenth foreign convention on utilized Cryptography and community safeguard, ACNS 2012, held in Singapore, in June 2012.

The 33 revised complete papers incorporated during this quantity have been conscientiously reviewed and chosen from 192 submissions. they're prepared in topical classes on authentication, key administration, block ciphers, identity-based cryptography, cryptographic primitives, cryptanalysis, facet channel assaults, community defense, net safety, safety and privateness in social networks, safety and privateness in RFID platforms, protection and privateness in cloud platforms, and protection and privateness in shrewdpermanent grids.

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Read Online or Download Applied Cryptography and Network Security: 10th International Conference, ACNS 2012, Singapore, June 26-29, 2012. Proceedings PDF

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Additional info for Applied Cryptography and Network Security: 10th International Conference, ACNS 2012, Singapore, June 26-29, 2012. Proceedings

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Furthermore, for types that only used a selection of uppercase letters and digits, these were defined as the input language for the OCR. 5 Results and Discussion An experiment was performed to test the accuracy of our methods. e. 100 samples for each of the 84 different types). Overall, our approach achieves a high degree of accuracy. We can automatically distinguish between the different HelloCaptcha types between 80%−100% of the time. D. -W. Chow, and W. Susilo types can correctly be distinguished 100% of the time.

27 (c) Combined image. Fig. 13. Example where 2 halves of the challenge always appear in the specific frames • • • • not unique to animated CAPTCHAs, it has previously been highlighted that this is a design issue that affects the robustness of CAPTCHAs in general [15]. The use of color. The use of color is another common issue that has to be considered in the design CAPTCHAs, whether animated or otherwise. The incorrect use of color can negatively affect the security of a CAPTCHA, and may possible even affect the usability [16].

The issues of fixed length CAPTCHA challenges that appear at fixed locations are Breaking an Animated CAPTCHA Scheme (a) Frame 45. (b) Frame 82. 27 (c) Combined image. Fig. 13. Example where 2 halves of the challenge always appear in the specific frames • • • • not unique to animated CAPTCHAs, it has previously been highlighted that this is a design issue that affects the robustness of CAPTCHAs in general [15]. The use of color. The use of color is another common issue that has to be considered in the design CAPTCHAs, whether animated or otherwise.

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