By Feng Hao, Dylan Clarke (auth.), Feng Bao, Pierangela Samarati, Jianying Zhou (eds.)
This booklet constitutes the refereed court cases of the tenth overseas convention on utilized Cryptography and community safety, ACNS 2012, held in Singapore, in June 2012.
The 33 revised complete papers integrated during this quantity have been conscientiously reviewed and chosen from 192 submissions. they're equipped in topical periods on authentication, key administration, block ciphers, identity-based cryptography, cryptographic primitives, cryptanalysis, facet channel assaults, community safety, internet protection, safety and privateness in social networks, protection and privateness in RFID structures, protection and privateness in cloud structures, and safeguard and privateness in clever grids.
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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Extra info for Applied Cryptography and Network Security: 10th International Conference, ACNS 2012, Singapore, June 26-29, 2012. Proceedings
This is the main method used to extract relevant information to break HelloCaptcha. A total of 61 of the 84 HelloCaptcha types can be broken using this approach. For the purpose of CAPTCHA usability, text characters required to solve the challenge in a textbased CAPTCHA often needs to be emphasized somehow. This is because the human brain needs to be able to distinguish and recognize the characters required to solve the challenge. g. ), in order to get the human user’s attention, the text characters required to solve the challenge are displayed at certain ﬁxed locations for longer periods of time compared to the noise elements and other peripheral components.
For example, when the contextual factor used is the URL (see below), the attack would be of the Diﬀerent-XF type whenever the URL used by the attacker is diﬀerent from that of the server - as is the case in most phishing attacks. 3, attacks of the Diﬀerent-XF type, will fail when using the contextual factor protocol. We thus only consider the more advanced attacks - those of the Same-XF type. We start by discussing the use of the URL as a contextual factor. Although the URL turns out to be quite strong for dealing with several types of attacks, other types require further protection, and the respective contextual factors providing that protection will follow.
Fig. D. -W. Chow, and W. Susilo (a) Example frames from a Smarties/Smarties CAPTCHA challenge. (b) Single PDM from all the frames. (c) Three PDMs, each constructed from consecutive 1 6 of the frames. (d) Separate characters from six PDMs. Fig. 3. Example of multiple PDMs from diﬀerent portions of the animated frames constructed using all the animation frames, one can see that the characters are joined together. Nevertheless, in this situation we can construct six PDMs by splitting the animation frames into six distinct frame sequences.