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Download Advances in Cryptology — EUROCRYPT ’96: International by Don Coppersmith, Matthew Franklin, Jacques Patarin, Michael PDF

By Don Coppersmith, Matthew Franklin, Jacques Patarin, Michael Reiter (auth.), Ueli Maurer (eds.)

The EUROCRYPT ’96 convention used to be backed by means of the foreign Asso- ation for Cryptologic examine (IACR)l, in cooperation with the college of Saragossa. It happened on the Palacio de Congresos in Saragossa, Spain, in the course of may well 12-16, 1996. This was once the 15th annual EUROCRYPT convention (this identify has been used because the 3rd convention held in 1984), every one of which has been held in a special urban in Europe. For the second one time, lawsuits have been to be had on the convention. JosC Pastor Franco, the overall Chair, was once resp- sible for neighborhood association and registration. His contribution to the snccess of the convention is gratefully stated. this system Committee thought of 126 submitted papers and chosen 34 for presentation. each one paper was once despatched to all individuals of this system Committee and used to be assigned to no less than 3 of them for cautious assessment. there have been additionally invited talks. James L. Massey, this year’s IACR unique Ltcturer, gave a lecture entitled “The trouble with difficulty”. Massey is the 3rd to obtain this honor, the 1st being Gustavus Simmons and Adi Shamir. Shafi Goldwasser gave an invited speak entitled “Multi occasion safe protocols: prior and present”. those lawsuits comprise revised types of the 34 contributed talks. whereas the papers have been conscientiously chosen, they've got now not been refereed like submissions to a refereed magazine. The authors undergo complete accountability for the contents in their papers. a few authors may possibly write ultimate types in their papers for e-book in a refereed journal.

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Additional info for Advances in Cryptology — EUROCRYPT ’96: International Conference on the Theory and Application of Cryptographic Techniques Saragossa, Spain, May 12–16, 1996 Proceedings

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T h e primary MAC algorithms used historically have been CBC-MAC and MAA. T h e Message Authenticator Algorithm (NIAA) is an IS0 standard [lo] which dates back to 1984 [7]. g. Kaliski and Robshaw 1121). Recently several new practical MAC: algorithms were proposed: XOR-MAC by Bellare et al. [2], HMAC by Bellare et al. [4], MDx-MAC by Preneel and van Oorschot [14], and the bucket-hashing MAC of Rogaway [16]. O. postdoctoral researcher, sponsored by the National Fund for Scientific Research (Belgium).

2. A single iteration of the main loop can be described as follows: Step 1: V Step 2: t l := rol(V); := H 1 , - l Ki := V CE W ; % rol denotes 1 bit cyclic shift left ext; H l i := ti 631 (((Kt + t 2 := H22-l @ 5 * ; t2) V A ) A C); H2, := t~ Q9z (((Ki @ t i ) V B)A D ) ; Here A = 02040801,, B = 00804021x, C = BFEF7FDFx, and D = 7DFEFBFFx. These constants fix 8 bits of the second factor (four to 0, and four to 1). The output transformation g consists of the coda iterations (where the key-dependent and T play the role of x i ) and final XORirig as rioted above.

This reasoning allows the following general result: Proposition 3. There exists n k q recovery nttack on one-key envelope methods such as that of RFC 1828, which requires q = [64/tl steps (1 5 t 5 64) to find 64 bits of the kev. 264 known texts of bitlength ci . 5 1 2 - t . i f o r some fixed ci > 1, a n d 2t+2 chosen texts. Table 1 summarizes the complexity t o find 64 key bits in t-bit slices, for different values o f t . If a 128-bit key is used with the remaining bits found by exhaustive search, the overall time complexity is on the order of the number of known texts.

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