Information Security Applications: 9th International by Christoph Herbst, Marcel Medwed (auth.), Kyo-Il Chung,

By Christoph Herbst, Marcel Medwed (auth.), Kyo-Il Chung, Kiwook Sohn, Moti Yung (eds.)

This e-book constitutes the completely refereed post-conference court cases of the ninth foreign Workshop on details defense purposes, WISA 2008, held in Jeju Island, Korea, in the course of September 23-25, 2008.

The 24 revised complete papers provided have been rigorously reviewed and chosen from a complete of 161 submissions. The papers are equipped in topical sections on shrewdpermanent card and safe undefined, instant and sensor community protection, public key crypto functions, privateness and anonymity, n/w defense and intrusion detection, in addition to program protection and belief management.

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Additional info for Information Security Applications: 9th International Workshop, WISA 2008, Jeju Island, Korea, September 23-25, 2008, Revised Selected Papers

Example text

EKj2 (βj2 ) using Kj2 to obtain the self-healing keys β1 , . . , βj1 , βj1 +1 . . βj2 . (d) Ui then computes Kj for all j = j1 +1, j1 +2, . . , j2 −1 as: Kj = Eβj (Kj−1 ). 46 3 Q. Xu and M. He Attack To Dutta’s Scheme In this section, we show how to attack Dutta’s scheme and access to any other’s secret keys and session keys which they should not know according to Dutta’s scheme. 1) Suppose that there are two users UA and UB whose identity is A and B respectively, the secret key of UA and UB is ψ(A) and ψ(B) respectively.

3) For any Ui that is an active user in session j1 and j2 (1 ≤ j1 ≤ j2 ≤ m), he can recover Kj2 and hence he can obtain self-healing keys β1 , . . , βj2 . And Ui also has the session key Kj1 which is recovered in j1 -th session. Hence, by the method of step 4 in Scheme1, Ui can subsequently recover the whole missed session keys. Hence we have that H(Kj |Zi,j1 , Zi,j2 ) = 0 (5). 2) We can easily prove that scheme1 satisfy Def inition2 following the same line of security analysis of [1], so scheme1 can satisfy t-wise forward and backward secrecy.

This is because the point blinding operation can be attacked 26 M. Medwed and E. Oswald using our technique in order to determine P . With P our original attack can be mounted in order to extract some bits of k. Hence, the attack is still feasible, although it requires a more effort in template building. This means, we either build a larger set of templates before the attack, or we switch to our template creation on-the-fly technique. As a matter of fact, the only types of countermeasures that prevent our template-based SPA attacks are countermeasures that provide DPA resistance by randomizing the coordinates of the base point P .

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