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Information Security Theory and Practices. Smart Devices, by Ton van Deursen, Sjouke Mauw, Saša Radomirović (auth.), Jose

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By Ton van Deursen, Sjouke Mauw, Saša Radomirović (auth.), Jose A. Onieva, Damien Sauveron, Serge Chaumette, Dieter Gollmann, Konstantinos Markantonakis (eds.)

This quantity constitutes the refereed court cases of the second one IFIP WG 11.2 overseas Workshop on details defense idea and Practices: shrewdpermanent units, Convergence and subsequent new release Networks, WISTP 2008, held in Seville, Spain, in could 2008.

The 10 revised complete papers provided have been conscientiously reviewed and chosen from quite a few submissions for inclusion within the booklet; they study the swift improvement of data applied sciences and the transition to subsequent iteration networks. The papers concentrate on the safety of those advanced and resource-constrained platforms and are equipped in topical sections on shrewdpermanent units, community defense, convergence, and cryptography.

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Extra info for Information Security Theory and Practices. Smart Devices, Convergence and Next Generation Networks: Second IFIP WG 11.2 International Workshop, WISTP 2008, Seville, Spain, May 13-16, 2008. Proceedings

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In the latter case, if r A Graphical PIN Authentication Mechanism 33 is the number of random answers allowed by the scheme, the set Am should be defined as: Am = {a = (a1 , . . , am ) ∈ {0, 1}m|w(a) ≤ r}. t. this attack. 6 Conclusion and Future Work In this paper we have presented a simple graphical PIN authentication mechanism that is resilient against shoulder surfing attacks. Our scheme is independent on the specific set of objects used to construct the challenges. The scheme may be implemented on low cost devices, does not require any special training for the users and requires a single round of interaction between the user and the terminal.

In this case we have the following side effects: – The success probability of a blind attack decreases to (1/a)c (1 − 1/a)m−c = 1/2m ; – The length of the user secret decreases; In this case, the length of the secret can be safely decreased to 10. – The user needs to remember the specific set of objects to which she has to answer correctly. Clearly this makes the user secret longer. We may circumvent this problem by providing the user with a specific hardware device that provides, at each authentication, a different set of answers to which the user has to answer correctly.

Although this goal is desirable for a software-based solution, it relies on assumptions of trustworthiness and lack of vulnerabilities in this underlying hardware. With today’s computer hardware this independence is unobtainable. Rutkowska’s attack, discussed in Sec. 3, provides a specific example of why hardware cannot be blindly trusted. If hardware cannot automatically be trusted it must be considered in security measurements. 38 M. Judge et al. An often overlooked aspect of a computer security monitor is the security of the monitor itself.

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