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 foreign convention on “Applied Cryptography and community Se- rity” (ACNS 2003) used to be subsidized and arranged by means of ICISA (International C- munications and knowledge safety Association), in cooperation with MiAn Pte. Ltd. and the Kunming govt. It was once held in Kunming, China in - tober 2003. The convention court cases used to be released as quantity 2846 of the Lecture Notes in laptop technology (LNCS) sequence of Springer-Verlag. The convention bought 191 submissions, from 24 international locations and areas; 32 of those papers have been approved, representing 15 nations and areas (acceptance cost of 16.75%). during this quantity you are going to ?nd the revised models of the - cepted papers that have been offered on the convention. as well as the most song of displays of accredited papers, an extra tune was once held within the convention the place shows of an business and technical nature got. those displays 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 enhance the - eas of utilized cryptography and its software to structures and community protection. 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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Extra info for Applied Cryptography and Network Security: First International Conference, ACNS 2003, Kunming, China, October 16-19, 2003. Proceedings

Example text

000 Table 13. 211 The Security of RC6 against Algorithms 5 The previous section have defined enough number of plaintexts and seen that Algorithm 5 can recover a correct key with the success probability of 90% by using enough many plaintexts. We conduct Tests 4 and 5 to Algorithm 5 on 4-round RC6 to find out enough number of plaintexts. The results are shown in Table 14, where SUC means the success probability to recover a correct key of Sa and Sb in Algorithm 2 to RC6P. Table 14 indicates that enough number of plaintexts is set to 222 plaintexts; and it is roughly equal to that which outputs 30 N.

5. Compute the average ave[s] of {χ2 [s][tb ][td ][xa ][xc ]}tb ,td ,xa ,xc for each s, and output s with the highest ave[s] as lsb2 (S2r )||lsb2 (S2r+1 ). Table 8 shows the results of Algorithm 4. Algorithm 4 classifies plaintexts into 218 groups of {lsb4 (B0 ), lsb4 (D0 ), xa , xc } and averages χ2 -value over each group. In the same discussion as Algorithms 2 and 3, we see that the average of χ2 values by using 227 plaintexts in Table 8 is roughly equal to that by using 29 plaintexts in the case of r = 3 of Table 5; and the variance of χ2 -values by using 227 plaintexts in Table 8 is about 1/218 as much as that by using 29 plaintexts in the case of r = 3 of Table 5.

Algorithm 5 differ with Algorithm 2 in a way of handling both S2r+2 and S2r+3 : Algorithm 2 uses a correct key on S2r+2 and S2r+3 ; but Algorithm 5 has to guess a correct key of S2r+2 and S2r+3 . Therefore, the results of Algorithm 5 against r-round RC6 is coincident with those of Algorithm 2 against r-round RC6P whenever correct keys on S2r+2 and S2r+3 are used. As a result, to discuss the security on RC6 against Algorithm 5, we have only to investigate the behavior of χ2 -value with using wrong-keys of S2r+2 and S2r+3 .

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