By Harald Niederreiter (auth.), Thomas Johansson, Subhamoy Maitra (eds.)

ISBN-10: 3540206094

ISBN-13: 9783540206095

ISBN-10: 3540245820

ISBN-13: 9783540245827

This booklet constitutes the refereed court cases of the 4th foreign convention on Cryptology in India, INDOCRYPT 2003, held in New Delhi, India in December 2003.

The 29 revised complete papers awarded including 2 invited papers have been rigorously reviewed and chosen from one hundred and one submissions. The papers are equipped in topical sections on flow ciphers, block ciphers, Boolean services, mystery sharing, bilinear pairings, public key cryptography, signature schemes, protocols, elliptic curve cryptography and algebraic geometry, implementation and electronic watermarking, and authentication.

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Extra info for Progress in Cryptology - INDOCRYPT 2003: 4th International Conference on Cryptology in India, New Delhi, India, December 8-10, 2003. Proceedings

Example text

Hence the total size of the look-up tables alone is 4 Kbyte. Clearly HBB is smaller. For fast software implementation, the loops in the subroutines will be “unfolded”. The size of the resulting code is roughly proportional to the number of operations required to implement one invocation of Round(). As we show below, this number is 219 and hence the code will consist of around 250 instructions. We now turn to estimating the number of operations required to complete one invocation of Round(). Steps 1 and 5 of Round() require 16 look-ups each; Steps 2 and 3 require a total of 11 bitwise operations and Step 4 requires 32 bitwise operations.

We write LCi for LC[i]. We assume that the rule vector of the first CA is given by R0 , . . , R7 where each Ri is a 32-bit word. The rule vector for the second CA is given by R8 , . . , R15 .

Return LC. The variables R0 and R1 are the 90/150 rule vectors for the two CA (see Section 2). The characteristic polynomials p0 (x) and p1 (x) of the two CA are distinct primitive polynomials of degree 256 and weight 129 each. These polynomials are defined below. p0 (x) = a0 ⊕ a1 x ⊕ · · · ⊕ a255 x255 ⊕ x256 p1 (x) = b0 ⊕ b1 x ⊕ · · · ⊕ b255 x255 ⊕ x256 The strings a0 . . a255 and b0 . . b255 are binary strings of length 256 and weight 128 each. In hex form these strings are as follows. (a0 .

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Progress in Cryptology - INDOCRYPT 2003: 4th International Conference on Cryptology in India, New Delhi, India, December 8-10, 2003. Proceedings by Harald Niederreiter (auth.), Thomas Johansson, Subhamoy Maitra (eds.)


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