be in plain text and therefore confidentiality could be compromised.
If the recipient's DCA is compromised then the recipient can not
guarantee the integrity of the message. Furthermore, even if the
recipient's DCA correctly verifies a message's signatures, then a
message could be undetectably modified, when there are no signatures
on a message that the recipient can verify.
7. DOMSEC ASN.1 Module
DOMSECSyntax
{ iso(1) member-body(2) us(840) rsadsi(113549)
pkcs(1) pkcs-9(9) smime(16) modules(0) domsec(10) }
DEFINITIONS IMPLICIT TAGS ::=
BEGIN
-- EXPORTS All
-- The types and values defined in this module are exported for
-- use in the other ASN.1 modules. Other applications may use
-- them for their own purposes.
SignatureType ::= SEQUENCE OF OBJECT IDENTIFIER
id-smime OBJECT IDENTIFIER ::= { iso(1) member-body(2)
us(840) rsadsi(113549) pkcs(1) pkcs-9(9) 16 }
id-sti OBJECT IDENTIFIER ::= { id-smime 9 } -- signature type
identifier
-- Signature Type Identifiers
id-sti-originatorSig OBJECT IDENTIFIER ::= { id-sti 1 }
id-sti-domainSig OBJECT IDENTIFIER ::= { id-sti 2 }
id-sti-addAttribSig OBJECT IDENTIFIER ::= { id-sti 3 }
id-sti-reviewSig OBJECT IDENTIFIER ::= { id-sti 4 }
END -- of DOMSECSyntax
8. References
[1] Ramsdell, B., "S/MIME Version 3 Message Specification", RFC2633,
June 1999.
[2] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC2119, March 1997.
[3] Hoffman, P., "Enhanced Security Services for S/MIME", RFC2634,
June 1999.
[4] International Telecommunications Union, Recommendation X.208,
"Open systems interconnection: specification of Abstract Syntax
Notation (ASN.1)", CCITT Blue Book, 1989.
[5] Housley, R., "Cryptographic Message Syntax", RFC2630, June 1999.
9. Authors' Addresses
Tim Dean
QinetiQ
St. Andrews Road
Malvern
Worcs
WR14 3PS
Phone: +44 (0) 1684 894239
Fax: +44 (0) 1684 896660
EMail: tbdean@QinetiQ.com
William Ottaway
QinetiQ
St. Andrews Road
Malvern
Worcs
WR14 3PS
Phone: +44 (0) 1684 894079
Fax: +44 (0) 1684 896660
EMail: wjottaway@QinetiQ.com
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