% references

\references

\ref{DCome83}
\by D.~Comer.
\paper The Computer Science Research Network CSnet:
A History and Status Report
\journal Communications of the ACM\volume 26\issue 10
\month October\year 1983
\pages 747--753
\endref

\ref{DCroc79}
\by D.H.~Crocker, E.S.~Szurkowski, D.J.~Farber.
\paper An Internetwork Memo Distribution Facility~---~MMDF
\inbook Proceedings,
Sixth Data Communications Symposium
\publaddr Asilomar
\month November\year 1979
\pages 18--25
\endref

\ref{DCroc82}
\by D.H.~Crocker.
\paper Standard for the Format of ARPA Internet Text Messages
\paperinfo Request for Comments 822
\other
\publ ARPA Internet Network Information Center (NIC)
\publaddr SRI International
\month August\year 1982
\endref

\ref{DEA}
\book Data Encryption Algorithm
\bookinfo X3.92--1981
\publ American National Standards Institute
\year 1981
\endref

\ref{DKing84}
\by D.P.~Kingston,~III.
\paper MMDFII: A Technical Review
\inbook Proceedings
Usenix Summer '84 Conference
\publaddr Salt Lake City, Utah
\month June\year 1984
\pages 32--41
\endref

\ref{EAllm83}
\by E.~Allman.
\paper SENDMAIL~---~An Internetwork Mail Router
\other
\publ Britton-Lee, Inc.
\publaddr Berkeley, California
\month July\year 1983
\endref

\ref{EOlse84}
\by E.W.~Olsen.
\paper NetOS Concepts and Facilities
\other
\publ Local Network Systems, Inc.
\publaddr Costa Mesa, California
\month August\year 1984
\endref

\ref{EStef84}
\by E.A.~Stefferud, J.N.~Sweet, T.P.~Domae.
\paper MZnet: Mail Service for Personal Micro-Computer Systems
\inbook Proceedings,
Second International Symposium on Computer Message Systems
\publaddr Nottingham, U.K
\month May\year 1984
\pages 293--302
\endref

\ref{FIKM}
\book Financial Institution Key Management
\bookinfo X9.17--198\_ (draft)
\publ American National Standards Institute
\year 198\_
\endref

\ref{FIPS46}
\book Data Encryption Standard
\bookinfo Federal Information Processing Standards,
Publication 46
\month January\year 1977
\endref

\ref{FIPS81}
\book DES Modes of Operation
\bookinfo Federal Information Processing Standards,
Publication 81
\month December\year 1980
\endref

\ref{FIPS98}
\paper Specification for Message Format for Computer Based Message Systems
\other
\publ National Bureau of Standards
\month January\year 1983
\endref

\ref{HERMES}
\by Bolt, Beranek, and Newman.
\paper Hermes User's Manual
\paperinfo for TOPS-20
\other
\publ Bolt, Beranek, and Newman
\publaddr Boston, MA
\month January\year 1979
\endref

\ref{IP}
\paper Internet Protocol
\paperinfo Request for Comments 791 (\milstd/ 1777)
\inbook Internet Protocol Transition Workbook
\publ ARPA Internet Network Information Center (NIC)
\publaddr SRI International
\month September\year 1981
\endref

\ref{JReyn84}
\by J.K.~Reynolds.
\paper Post Office Protocol
\paperinfo Request for Comments 918
\other
\publ ARPA Internet Network Information Center (NIC)
\publaddr SRI International
\month October\year 1984
\endref

\ref{LLamp82}
\by L.~Lamport, R.~Shostak, M.~Pease.
\paper The Byzantine Generals Problem
\journal ACM Transactions on Programming Languages and Systems
\volume 4
\month July\year 1982
\pages 382--401
\endref

\ref{MButl85}
\by M.~Butler, J.B.~Postel, et.~al.
\paper Post Office Protocol - Version~2
\paperinfo Request for Comments 937
\other
\publ ARPA Internet Network Information Center (NIC)
\publaddr SRI International
\month February\year 1985
\endref

\ref{MRose84a}
\by M.T.~Rose.
\paper The Rand MH Message Handling System: The UCI BBoards Facility
\other
\publ Department of Computer and Information Sciences
\publaddr University of Delaware
\month October\year 1984
\endref

\ref{MRose84b}
\by M.T.~Rose.
\paper The Rand MH Message Handling System: Tutorial
\other
\publ Department of Computer and Information Sciences
\publaddr University of Delaware
\month October\year 1984
\endref

\ref{MRose85a}
\by M.T.~Rose, J.L.~Romine.
\paper The Rand \MH/ Message Handling System: User's Manual
\paperinfo UCI Version
\other
\publ Department of Information and Computer Science
\publaddr University of California, Irvine
\month January\year 1985
\endref

\ref{MRose85b}
\by M.T.~Rose, E.A.~Stefferud.
\paper Proposed Standard for Message Encapsulation
\paperinfo Request for Comments 934
\other
\publ ARPA Internet Network Information Center (NIC)
\publaddr SRI International
\month January\year 1985
\endref

\ref{MRose85c}
\by M.T.~Rose, D.J.~Farber, S.T.~Walker.
\paper Design of the TTI Prototype Trusted Mail Agent
\inbook Proceedings,
Second International Symposium on Computer Message Systems
\publaddr Washington, D.C.
\month September\year 1985
\toappear
\endref

\ref{MRose85d}
\by M.T.~Rose, E.A.~Stefferud, J.N.~Sweet.
\paper MH: A Multifarious User Agent
\journal Computer Networks%\volume V\issue N
\toappear
\endref

\ref{SMTP}
\paper Simple Mail Transfer Protocol
\paperinfo Request for Comments 821
\other
\publ ARPA Internet Network Information Center (NIC)
\publaddr SRI International
\month August\year 1982
\endref

\ref{TCP}
\paper Transmission Control Protocol
\paperinfo Request for Comments 793 (\milstd/ 1778)
\inbook Internet Protocol Transition Workbook
\publ ARPA Internet Network Information Center (NIC)
\publaddr SRI International
\month September\year 1981
\endref

\ref{VVoyd83}
\by V.L.~Voydock, S.T.~Kent.
\paper Security Mechanisms in High-Level Network Protocols
\journal Computing Surveys\volume 15\issue 2
\month June\year 1983
\pages 135--171
\endref

\ref{WJoy83}
\by W.N.~Joy, E.~Cooper, R.S.~Fabry, S.J.~Leffler, K.~McKusick, D.~Mosher.
\paper 4.2\bsd/ System Manual
\paperinfo Technical Report Number 5
\publ Computer Systems Research Group, University of California, Berkeley
\month July\year 1983
\endref

\ref{X.400}
\book Message Handling Systems: System Model-Service Elements
\bookinfo Recommendation X.400
\publ International Telegraph and Telephone Consultative Committee (CCITT)
\endref

\endreferences