Download Advances in Cryptology — CRYPTO ’94: 14th Annual by Mitsuru Matsui (auth.), Yvo G. Desmedt (eds.) PDF

By Mitsuru Matsui (auth.), Yvo G. Desmedt (eds.)

ISBN-10: 3540583335

ISBN-13: 9783540583332

The CRYPTO ’94 convention is subsidized by means of the overseas organization for Cryptologic examine (IACR), in co-operation with the IEEE laptop Society Technical Committee on defense and privateness. It has taken position on the Univ- sity of California, Santa Barbara, from August 21-25,1994. this is often the fourteenth annual CRYPTO convention, all of which were held at UCSB. this can be the 1st time that complaints can be found on the convention. the final Chair, Jimmy R. Upton has been chargeable for neighborhood association, registration, and so forth. there have been 114 submitted papers which have been thought of by means of this system Committee. of those, 1 used to be withdrawn and 38 have been chosen for the proce- ings. There also are three invited talks. of those are on facets of cryptog- phy within the advertisement international. the only on elements may be awarded via David Maher (AT&T), the only on software program elements by way of Joseph Pato (Hewlett- Packard). there'll even be a panel dialogue on “Securing an digital global: Are We Ready?” The panel participants might be: Ross Anderson, Bob Blakley, Matt Blaze, George Davida, Yvo Desmedt (moderator), Whitfield Diffie, Joan Feig- baum, Blake Greenlee, Martin Hellman, David Maher, Miles Smid. the subject of the panel could be brought by means of the invited speak of Whitfield Diffie on ”Securing the data street. ” those lawsuits include revised types of the 38 contributed talks. each one i paper was once despatched to at the very least three individuals of this system committee for comments.

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Extra resources for Advances in Cryptology — CRYPTO ’94: 14th Annual International Cryptology Conference Santa Barbara, California, USA August 21–25, 1994 Proceedings

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Of more practical irriportance is Algorithm 2 [5] which allows a cryptanalyst attacking DES t o recover up to 13 bits of key information in the full 16-round DES. More gencrslly, for a n r-round Feistel cipher we approximate ( r - 2) iterations of the F-function from the second t o the ( r - l)t" round using some linear approximation while guessing the subkey bits that are relevant to the first and final rounds. To keep the number of candidates small, it is advisable to corisider linear approximations that involve guessing few subkey bits in the first and rth 28 round.

Pi : PH[7, 18,24, 29] 8 PL[15] * Kx[22] © P-, : PH[7,18, 24] e P t [12, 16] e Kx [19, 23] * 6' L [7,18,24] = K3[22] © K4[44] © Ks[22] CL[7,18, 24, 29] = K3[22] © K4[44] e Ks[22] (7) (8) We can use both linear approximations in Algorithm IM while guessing whether the right sides are equal or not. The results of this experiment are provided below. 81 x 10~ 3 . The success rates provided in the table below are for the correct guess, which in our experiment was that the right sides are equal. More analysis of this technique will be presented in future work.

Iphertext pairs are required to give the same level of confidence that the identification is correct. The basic algorithm that allows the cryptanalyst to deduce one bit of key information from a single linear approximation is Algorithm 1 in [4,51. i+ 4 4+ a Algorithm 1 Suppose that equation 1, P [ x p ]@ C,"X~;] p=$+c. = K [ X K ] is, correct with probability Let T be the number of plaintext/ciphertext pairs such that the left Step 1 side of equation 1 is equal to O and let N be the total nuniber of pairs.

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