Advances in Cryptology — CRYPTO’ 86: Proceedings by E. F. Brickell, J. H. Moore, M. R. Purtill (auth.), Andrew PDF

By E. F. Brickell, J. H. Moore, M. R. Purtill (auth.), Andrew M. Odlyzko (eds.)

ISBN-10: 3540180478

ISBN-13: 9783540180470

ISBN-10: 3540477217

ISBN-13: 9783540477211

This booklet is the lawsuits of CRYPTO 86, one in a chain of annual meetings dedicated to cryptologic examine. they've got all been held on the college of California at Santa Barbara. the 1st convention during this sequence, CRYPTO eighty one, geared up by way of A. Gersho, didn't have a proper court cases. The court cases of the subsequent 4 meetings during this sequence were released as: Advances in Cryptology: lawsuits of Crypto eighty two, D. Chaum, R. L. Rivest, and A. T. Sherman, eds., Plenum, 1983. Advances in Cryptology: complaints of Crypto eighty three, D. Chaum, ed., Plenum, 1984. Advances in Cryptology: complaints of CRYPTO eighty four, G. R. Blakley and D. Chaum, eds., Lecture Notes in desktop technological know-how #196, Springer, 1985. Advances in Cryptology - CRYPTO '85 lawsuits, H. C. Williams, ed., Lecture Notes in computing device technology #218, Springer, 1986. A parallel sequence of meetings is held every year in Europe. the 1st of those had its complaints released as Cryptography: complaints, Burg Feuerstein 1982, T. Beth, ed., Lecture Notes in desktop technological know-how #149, Springer, 1983.

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Slmllar experiment was performed wlth K(4) and K(11) as the keys in the Micro DES Engine. We found that a value for y cxlsted for whlch m g Q m g = U n8 0 n9 when U Is equal to U 1 or U 2 but not when U = U3. Perhaps these strange results wlll point to new directions i n this mtudy of cycles of cycles for these sernl-weak keys. A - New Directions The results reported here are part of a study whleh Is not y e t complete. We wlll continue to collect statlstlcs on the cycles obtained by alternate cncryptfons using two weak keys and also on the Cycles uslng semi-weak keys which have antlpalindromic sequences of round keys.

Thus x and _----- - x art ir. the cycle for K, but because E(K,xf= E(E,G], these polnts are also in the cycle for g . Schematically, we have C b d 27 Now consider the points a = E(K,Z) and b = E(k,x). Notice that -_____ - Also, since 2 is the Inverse key for K , w e have that c = D ( X , x ) = E(k,x) b = Hence the utructure 8 h O m in the last diagram can be replaced by 6 * E(%,x) = E(K,G) = a. a. agram. , every point, u, In the cycle I s reflected in the diameter drawn through the centers of the antipodal antifixed point pairs into its complement, u.

So, the implicit compression that results from the reduction modulo Nn),has the required one-way property. As a consequence, it is not necessary with the DJ scheme to use chaining or a separate compression function for signing large messages. Furthermore, it is likely that implicit compression is much easier (cheaper) to perform than separate compression, since a separate compression function is likely to involve a much more complex computation than just a reduction modulo $+I) of 2M 1. 4. Computational costs Because of the above mentioned implicit compression, forming a signature costs one exponentiation in modulo n arithmetic to an exponent of at most 800 bits.

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Advances in Cryptology — CRYPTO’ 86: Proceedings by E. F. Brickell, J. H. Moore, M. R. Purtill (auth.), Andrew M. Odlyzko (eds.)

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