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13 {\it Proceedings, Second International Symposium on Computer Message
23 Copyright $
\copyright$
{\oldstyle 1985},
28 \def\uci@footpage
{\draftstring\hfil\rm\folio}
39 \def\TTI/
{{\sl TTI\/
}}
42 \def\itemm$
#1$
{\item{$
#1\/$:
}}
45 Design of the TTI Prototype\\
46 Trusted Mail Agent
\title
47 Marshall T.~Rose$^
\dagger$\\
49 Stephen T.~Walker
\author\info
50 \footnote{}{\hskip -
\parindent
51 $^
\dagger$ All three authors are with Trusted Technologies, Incorporated,
52 POB~
45, Glenwood,~MD~
21738, USA.
53 Telephone:
301/
854--
6889.
54 In addition, Professor Farber is with the University of Delaware.
}
56 \centerline{\sc Abstract
}
57 {\rightskip=
0pt
\narrower\narrower
59 The design of the
\TTI/ prototype Trusted Mail Agent (
\TMA/) is discussed.
60 This agent interfaces between two entities:
61 a key distribution center (
\KDC/) and a user agent (
\UA/).
62 The
\KDC/ manages keys for the encryption of text messages,
63 which two subscribers to a key distribution service (
\KDS/) may exchange.
64 The
\TMA/ is independent of any underlying message transport system.
67 Subscribers to the
\KDC/ are known by unique identifiers,
69 In addition to distributing keys,
70 the
\KDC/ also offers a simple directory lookup service,
71 in which the ``real-world'' name of a subscriber may be mapped to an ID,
72 or the inverse mapping may be performed.
75 This
document details three software components:
77 a prototype key distribution service,
78 which has been running in a TCP/IP environment since December,
1984;
80 a prototype trusted mail agent;
83 modifications to an existing
\UA/,
84 the Rand
\MH/ Message Handling system,
85 which permit interaction with the prototype
\TMA/.
94 \unskip\footnote{}{\hskip -
\parskip This
document (version
\versiontag/)
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\today\ with DISS.STY v
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}