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Towards acceptable key escrow systems

Published: 02 November 1994 Publication History

Abstract

Escrowed Key Cryptosystems hold the promise of faithfully realizing legal guarantees of privacy for users under normal circumstances while at the same time insuring that privacy can be breached by authorities in special circumstances under appropriate legal safeguards. The most attractive feature of these schemes is that it is possible to ensure that the interests of each of the parties—the users, the law enforcement or national security agencies, the court or other monitoring entities and the escrow agents—can all be guaranteed up to the level of integrity of the protocol or cryptosystem. Unfortunately, the first scheme to attempt this, the Clipper protocol as adopted by the U.S., completely fails to do so for either the user(s) or for the monitoring entities. In this paper a new escrowed key protocol and new devices are described that verifiable protect the interests of all parties by positively implementing legal guarantees of privacy and access.

References

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TH. BETH, H.-J. KNOBLOCH, M. OTTEN: Verifiable Secret Sharing for Monotone Access Structures, Proc. 1s~ ACM Conference on Computer and Communications Security, Fairfax, USA, November 1993, pp. 189-194
[2]
M. BLAZE: Protocol Failure in the Escrowed Encryption Standard, AT&T Bell Laboratories, Preprint, June 1994
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TH. BETH: Keeping Secrets a Personal Matter or: The Exponential Security System, Proceedings IMA-Workshop on Cryptography and Coding, Cirencester, UK, December 1991
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W. DIFFIE, M. E. HELLMAN: New Directions in Cryptography, IEEE Trans. on Information Theory 22, 1976, pp. 644--654
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T. ELGAMAL: A Public Key Cryptosystern and a Signature Scheme Based on Discrete Logarithms, IEEE Trans. on Information Theory 31, 1985, pp. 469-472
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B. KLEIN, M. OTTEN, TH. BETH: Conference Key Distribution Protocols in Distributed Systems, Proc. 4th IMA Conference oll Cryptography and Coding, Cirencester, UK, December 1993, to be published
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H. STRACK, K.-Y. LAM: Context-Dependent Access Control in Distributed Systems, Proceedings of IFIP//SEC '93 - 9th International Computer Security Symposium and Exhibition, Toronto, Canada, May 1993
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cover image ACM Conferences
CCS '94: Proceedings of the 2nd ACM Conference on Computer and communications security
November 1994
293 pages
ISBN:0897917324
DOI:10.1145/191177
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Published: 02 November 1994

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CCS '94 Paper Acceptance Rate 31 of 70 submissions, 44%;
Overall Acceptance Rate 1,261 of 6,999 submissions, 18%

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