The newest Communications of the ACM (March 90) is entitled "How to Use Key Escrow." I haven't read it yet, but on a quick glance, I don't see some of the newer schemes I've heard of, but there is an article "taxonomy of key escrow encryption systems" by Denning and Branstad -- Which does briefly mention of the Lotus scheme and some of the other published schemes that I was thinking of. _______________________ Regards, 8146th member of the CIEC coalition Joseph Reagle http://farnsworth.mit.edu/~reagle/home.html reagle@mit.edu 0C 69 D4 E8 F2 70 24 33 B4 5E 5E EC 35 E6 FB 88