© 2002 by British Computer Society
A Key Escrow Scheme with Time-Limited Monitoring for One-way Communication
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.