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

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

This ebook constitutes the refereed complaints of the tenth overseas convention on utilized Cryptography and community protection, ACNS 2012, held in Singapore, in June 2012.

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

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Ben-David et al. URL + Server’s Certificate The server’s certificate can be used together with the URL which would allow also the inclusion of transaction data. In general, combining several contextual factors, gives the accumulative benefits of all the factors. 4 Session Key Suppose any of the SSL/TLS session keys with the server (or a pseudo random function of it) is available to be used as a contextual factor in addition to the server’s certificate (and possibly also the URL). This is an alternative way to foil the previous attack using a faked certificate because the XOTP created by the browser extension and sent to the attacker (using one SSL/TLS connection) will be different than the server expected XOTP for a second SSL/TLS connection used by the attacker to the real server.

B) Removing ‘holes’. 25 (c) After filling. Fig. 11. Example of refining the extracted image by filling in the unwanted holes (a) Before shape removal. (b) Reference image. (c) After shape removal. Fig. 12. Example of shape removal from the extracted image • Shape removal. The Popup/Love type is an example of a HelloCaptcha type where each character is encapsulated within a heart shape, as can be seen in Fig. 12(a). To remove these shapes, we obtain a reference image containing the shapes, shown in Fig.

In our study, we used the number of frames as one of the factors to differentiate between the various HelloCaptcha types. Furthermore, specific frames may be used to obtain certain pieces of information. For example, by evaluating 1,000 samples of the H-mover/Default type, we observed that it always uses a the total of 123 frames. In addition, frame number 45 always contains the first three characters and frame number 82 always contains the last three characters. This can be seen from the examples shown in Fig.

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