By Mikael Goldmann, Mats NÄslund (auth.), Burton S. Kaliski Jr. (eds.)

ISBN-10: 3540633847

ISBN-13: 9783540633846

This e-book constitutes the refereed complaints of the seventeenth Annual foreign Cryptology convention, CRYPTO'97, held in Santa Barbara, California, united states, in August 1997 lower than the sponsorship of the foreign organization for Cryptologic examine (IACR).

The quantity provides 35 revised complete papers chosen from one hundred sixty submissions acquired. additionally integrated are invited shows. The papers are prepared in sections on complexity idea, cryptographic primitives, lattice-based cryptography, electronic signatures, cryptanalysis of public-key cryptosystems, info concept, elliptic curve implementation, number-theoretic structures, disbursed cryptography, hash features, cryptanalysis of secret-key cryptosystems.

**Read Online or Download Advances in Cryptology — CRYPTO '97: 17th Annual International Cryptology Conference Santa Barbara, California, USA August 17–21, 1997 Proceedings PDF**

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**Additional info for Advances in Cryptology — CRYPTO '97: 17th Annual International Cryptology Conference Santa Barbara, California, USA August 17–21, 1997 Proceedings**

**Sample text**

31 Conventional Cryptography 5 Recompute Question 3 under the constraint that initially two clocking taps out of three are both one. 6 Check whether the assumption is true or false now for this variant of A5/1. 7 Compare the lower bounds obtained in questions 3 and 5, and briefly discuss the security strength of A511 and its variant. 8. We assume that the three initial values of the LFSRs are chosen independently and uniformly at random. 1 For i = 1,2,3, what is the probability that Ri is shifted at the first clock?

5, find a relation between A", k3, IV, and C1. Similarly, find a relation between A", IV, C1, and C2. Deduce a relation between k3, IV, C1, and C2. 3 Deduce an attack which recovers k3. Once k3 is found, how do you recover kl and k2? What is the complexity of the whole attack? 6). This time, we are going to mount a chosen-ciphertext attack. The ciphertext C we choose, is the concatenation of four n-bit blocks such that C = (A, A, B , B) (where A, B denote arbitrary blocks of n bits). The four blocks of the corresponding plaintext are denoted Pl to P4.

What can you say about the security of ExtDES now? D Exercise 8 Solution on page 40 Attack Against the OFB Mode Assume that someone sends encrypted messages by using DES in the OFB mode of operation with a secret (but fixed) IV value. 1 Show how to perform a known plaintext attack in order to decrypt transmitted messages. 2 Is it better with the CFB mode? 3 What about the CBC mode? D Solution on page 42 22 EXERCISE BOOK Exercise 9 *Linear Feedback Shift Registers We consider the ring Z2[X] of polynomials with coefficients in Z2 with the usual addition and multiplication.

### Advances in Cryptology — CRYPTO '97: 17th Annual International Cryptology Conference Santa Barbara, California, USA August 17–21, 1997 Proceedings by Mikael Goldmann, Mats NÄslund (auth.), Burton S. Kaliski Jr. (eds.)

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