Download Advances in Cryptology — CRYPTO’ 93: 13th Annual by Adi Shamir (auth.), Douglas R. Stinson (eds.) PDF

By Adi Shamir (auth.), Douglas R. Stinson (eds.)

The CRYPTO ’93 convention was once backed by means of the foreign organization for Cryptologic examine (IACR) and Bell-Northern study (a subsidiary of Northern Telecom), in co-operation with the IEEE laptop Society Technical Committee. It came about on the collage of California, Santa Barbara, from August 22-26, 1993. This was once the 13th annual CRYPTO convention, all of that have been held at UCSB. The convention used to be very stress-free and ran very of the overall Chair, Paul Van Oorschot. easily, mostly end result of the efforts It was once a excitement operating with Paul through the months major as much as the convention. there have been 136 submitted papers that have been thought of by way of this system Committee. of those, 38 have been chosen for presentation on the convention. there has been additionally one invited speak on the convention, awarded via Miles Smid, the name of which was once “A prestige file at the Federal govt Key Escrow System.” The convention additionally incorporated the known Rump consultation, which used to be presided over by means of Whit Diffie in his traditional inimitable type. thank you back to Whit for organizing and operating the Rump consultation. This yr, the Rump consultation incorporated a fascinating and vigorous panel dialogue on concerns referring to key escrowing. these participating have been W. Diffie, J. Gilmore, S. Goldwasser, M. Hellman, A. Herzberg, S. Micali, R. Rueppel, G. Simmons and D. Weitzner.

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Extra resources for Advances in Cryptology — CRYPTO’ 93: 13th Annual International Cryptology Conference Santa Barbara, California, USA August 22–26, 1993 Proceedings

Example text

The proof of Theorem 1 indicates that a decimation of the 2-sequence by factors of Ws = 2l’l-l implies the decimation of the A-sequence by a factor of Ts = 21sl 1. Therefore, from z ( i + j W s ) , j = 0,1,. ,2. [ A / 1 one derives z ( i +jWs), for all j . JA)2) (even if the connections are secret). In addition to this computational complexity this attack requires 21’1 1Al consecutive bits from the sequence. In any case, the parameters for the SG should be chosen such that collecting this many number of sequence bits be infeasible.

1) is usually lower than introducing a third LFSR (this is due to the fact that XOR gates usually cost significantly less than memory elements). Moreover, this third LFSR brings the effective key length of Gunther’s scheme to one third of the total length (it can be broken through exhaustive search on only one of the three registers). g. one of any two consecutive bits originally output by one of the LFSRs appears in the generator’s output sequence. Locality appears in other versions of clock-controlled generators as well.

Finally, let us mention that the idea of outputting individual bits of a sequence, is best captured by the notion of hard bits of a one-way function, a notion that 38 plays a central role in the construction of complexity-theory based pseudorandom generators (see [4,201 and subsequent works). It would be interesting t o know whether the shrinking generator applied to two &-predictable sequences guarantees, in general, a third sequence which is €’-predictable for E’ < E < f . (Roughly speaking, a sequence is &-predictableif no polynomial-time algorithm can predict it with probability greater than $ E ) .

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