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The Computer Journal 2002 45(6):661-671; doi:10.1093/comjnl/45.6.661
© 2002 by British Computer Society
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A Key Escrow Scheme with Time-Limited Monitoring for One-way Communication

Masayuki Abe1 and Masayuki Kanda1

1 NTT Laboratories, 1-1 Hikari-no-oka, Yokosuka-shi 239-0847, Japan Email: abe@sucaba.isl.ntt.co.jp

This paper studies several of the properties necessary for public-key-based escrow schemes, and observes that previous schemes lack some important properties. Focusing on the type of communication typified by email, we construct a novel and simple scheme that provides ‘warrant bounds’, ‘admissibility’, ‘surveillance switching’, ‘non-directive monitoring’, ‘off-line agency’ and many other useful properties all at the same time.

Received 4 April, 2000. Revised 30 April, 2002.


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