Applied Cryptography and Network Security: First by Ventzislav Nikov, Svetla Nikova, Bart Preneel (auth.),

By Ventzislav Nikov, Svetla Nikova, Bart Preneel (auth.), Jianying Zhou, Moti Yung, Yongfei Han (eds.)

The 1st overseas convention on “Applied Cryptography and community Se- rity” (ACNS 2003) used to be backed and arranged through ICISA (International C- munications and data safety Association), in cooperation with MiAn Pte. Ltd. and the Kunming govt. It was once held in Kunming, China in - tober 2003. The convention lawsuits used to be released as quantity 2846 of the Lecture Notes in laptop technology (LNCS) sequence of Springer-Verlag. The convention acquired 191 submissions, from 24 nations and areas; 32 of those papers have been authorized, representing 15 international locations and areas (acceptance expense of 16.75%). during this quantity you are going to ?nd the revised types of the - cepted papers that have been offered on the convention. as well as the most tune of shows of authorised papers, an extra tune was once held within the convention the place displays of an business and technical nature got. those shows have been additionally conscientiously chosen from a wide set of presentation proposals. This new overseas convention sequence is the results of the imaginative and prescient of Dr. Yongfei Han. The convention concentrates on present advancements that strengthen the - eas of utilized cryptography and its program to platforms and community safety. The objective is to symbolize either educational learn works and advancements in - dustrial and technical frontiers. We thank Dr. Han for beginning this convention and for serving as its common Chair.

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Additional info for Applied Cryptography and Network Security: First International Conference, ACNS 2003, Kunming, China, October 16-19, 2003. Proceedings

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AV (1k )}P S(1 ,E) when all of them, together, exist within a pseudonyms system P S. CP S is secure if there exists a simulator S (ideal-world adversary) such that the following holds, for all interactive probabilistic polynomial-time machines A (real-world adversary), for all sufficiently large k: (1) In the IP S, S controls the players in the ideal-world corresponding to those real world players controlled by A. 3 Functional Definitions This section provides functional definitions in our pseudonym system.

In order to generate a signature on P(U,Oi ) , both U and Oi run GV : 1. U identifies as its owner by P K 2 {(α, β) : P(U,Oi ) = gG α hG β }, for P(U,Oi ) in Oi ’s database. Anonymity-Enhanced Pseudonym System 41 2. Oi generates Q(U,Oi ) := P(U,Oi ) x(Oi ,G) , t1 := gG r and t2 := P(U,Oi ) r for r ∈R {0, 1}2 n , and sends Q(U,Oi ) , t1 and t2 to U . 3. U chooses r1 , r2 and r3 ∈R {0, 1}2 n and computes t1 := t1 gG r1 y(Oi ,G) r2 , r t2 := (t2 P(U,Oi ) r1 Q(U,Oi ) r2 ) 3 , P(U,Oi ) := P(U,Oi ) r3 and Q(U,Oi ) := Q(U,Oi ) r3 .

2 Differences between Algorithms 2 and 5 To investigate the difference between two algorithms, let us observe how wrongkeys of S2r+2 have an influence on a key recovery in Algorithm 5 when a correct key is set to S2r+3 . Table 12 shows the experimental results of Algorithm 2 on RC6P-8 or Algorithm 5 on RC6-8, in which Algorithm 2 recovers 4-bit subkeys of lsb2 (S8 ) and lsb2 (S9 ); and Algorithm 5 recovers 12-bit subkeys of lsb2 (S8 ), lsb2 (S9 ), and S10 . Table 12 indicates that: Algorithm 5 cannot work as effectively as Algorithm 2 if a few plaintexts like 211 or 212 are used; but Algorithm 5 can work as effectively as Algorithm 2 if enough many plaintexts like 214 or 215 are used.

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