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From: galvin@udel.EDU (James M Galvin)
Newsgroups: sci.crypt
Subject: Re: Protecting TAC Access Via Radio
Message-ID: <414@louie.udel.EDU>
Date: Wed, 5-Aug-87 14:48:40 EDT
Article-I.D.: louie.414
Posted: Wed Aug  5 14:48:40 1987
Date-Received: Sat, 8-Aug-87 03:41:03 EDT
References: <2312@okstate.UUCP>
Reply-To: galvin@udel.EDU (James M Galvin)
Distribution: world
Organization: University of Delaware
Lines: 18

In article <2312@okstate.UUCP> ks@okstate.UUCP (Kurt F. Sauer) writes:
>Create a hypothetical TAC access scheme where we have four primitives:
>...
>Presume, also, that all communications are tapped (i.e. over packet radio).
>Does the following schema seem plausible?
>...
>Question: Do you believe this to be a reasonable way to proceed?  My incli-
>	   nation is to use DES functions...which seems to have suitable
>	   properties for this sort of operation.

Question:  How do you propose to initially distribute the key encrypting
keys to both the TAC and the user?  All keys need a cryptoperiod, defined by
time and number of uses.  How do you propose to distribute new key encrypting
keys?

Jim
-- 
James M Galvin