Cryptography and Coding: 7th IMA International Conference by Kenneth G. Paterson (auth.), Michael Walker (eds.)

By Kenneth G. Paterson (auth.), Michael Walker (eds.)

This e-book constitutes the refereed complaints of the seventh IMA convention on Cryptography and Coding held in Cirencester, united kingdom, in December 1999.
The 35 revised complete papers provided have been conscientiously reviewed and chosen for inclusion within the lawsuits. one of the subject matters coated are error-correcting coding, mathematics coding for info compression and encryption, picture coding, biometric authentication, broadcast channel entry, graph and trellis interpreting, faster codes, convolution codes, Reed Solomon codes, elliptic curve cryptography, primality checking out, finite-field mathematics, and cryptographic protocols.

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Extra resources for Cryptography and Coding: 7th IMA International Conference Cirencester, UK, December 20–22, 1999 Proceedings

Example text

Using the Walsh transform a Boolean function f (x) is balanced iff Fˆ (0) = 0. The nonlinearity of f (x) is now given by, Nf = 2n−1 − 1 max |Fˆ (ω)|, ω = 0. , Fˆ (ω) = 0 , 0 ≤ |ω| ≤ m. We now briefly describe DSA. Assume that a function f (x) is given. In order to increase the nonlinearity, DSA tries to decrease the entry with the maximum absolute value in Fˆ . Let vectors fˆ∗ and Fˆ ∗ denote the polarity truth table and Walsh coefficients respectively, after the k-th entry in fˆ has been complemented.

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V. Kumar. Binary sequences with Gold-like correlation but larger linear span. IEEE Trans. Inform. Theory, IT-40(2): 532–537, March 1994. [4] L. Carlitz and S. Uchiyama. Bounds for exponential sums. Duke Math. , 24:37– 41, 1957. S. M. C. Bingham. DMT-based ADSL: concept, architecture, and performance. In IEE Colloquium on ‘High Speed Access Technology and Services, Including Video-on-Demand’, pages 3/1–6, Oct. 1994. J. Cimini, Jr. Analysis and simulation of a digital mobile channel using orthogonal frequency division multiplexing.

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