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) was once backed and arranged via ICISA (International C- munications and knowledge safety Association), in cooperation with MiAn Pte. Ltd. and the Kunming executive. It was once held in Kunming, China in - tober 2003. The convention complaints used to be released as quantity 2846 of the Lecture Notes in machine technological know-how (LNCS) sequence of Springer-Verlag. The convention got 191 submissions, from 24 international locations and areas; 32 of those papers have been authorised, representing 15 international locations and areas (acceptance expense of 16.75%). during this quantity you'll ?nd the revised models of the - cepted papers that have been offered on the convention. as well as the most tune of shows of authorized papers, an extra music was once held within the convention the place shows of an business and technical nature got. those shows have been additionally conscientiously chosen from a wide set of presentation proposals. This new foreign 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 structures and community safeguard. The target 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 basic Chair.

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Example text

Optimized χ2 -Attack against RC6 23 The decryptions of yd and yb are set to za and zc , respectively, which are denoted by a 6-bit integer z = za ||zc . 3. For each value s, xa , xc , and z, update each array by incrementing count[s][xa ][xc ][z]. 4. For each s, xa , and xc , compute χ2 [s][xa ][xc ]. 5. Compute the average ave[s] of {χ2 [s][xa ][xc ]}xa ,xc for each s and output s with the highest ave[s] as lsb2 (S2r )||lsb2 (S2r+1 ). Algorithm 3 1. Choose a plaintext (A0 , B0 , C0 , D0 ) with lsb5 (D0 ) = 0, set t = lsb5 (B0 ), and encrypt it.

2 Test 4 is the same as the results of correct keys in Algorithm 2 to RC6P. Optimized χ2 -Attack against RC6 29 The results are shown in Table 13, where SUC means the success probability to recover a correct key of Sa and Sb in Algorithm 2 to RC6P-8. 5 plaintexts. 5 plaintexts. Table 13 also indicates that the χ2 -value recovered by almost-correct wrong keys does not become high even if many plaintexts are used. This reflects that: the f -function of RC6 is the nonlinear conversion which depends on all 32-bit inputs; and thus the recovered value does not output high χ2 -value if only the input of f -function differs with a correct input even in 1 bit.

It stores XG := (pG , qG ) as its secret-keys, and publishes YG := (nG , dG , eG , fG , gG , hG ) as its publickey together with a proof that nG is the product of two safe primes and that the elements dG , eG , fG , gG and hG lie indeed in QRnG . 2. An organization Oi chooses a secret-key x(Oi ,G) ∈R Γ and sets a corresponding public-key y(Oi ,G) := gG x(Oi ,G) (mod nG ) to register with group G. Oi stores x(Oi ,G) as a secret-key X(Oi ,G) and publishes y(Oi ,G) and its identity id(Oi ,G) as Oi ’s public-keys Y(Oi ,G) .

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