Signing Certificate Attribute Specification

Document Type Expired Internet-Draft (smime WG)
Author Jim Schaad
Last updated 1998-07-07
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


A set of attacks on SignedData objects have been identified relating to the fact that the certificate to be used when verifying the signature in a SignerInfo is not cryptographically bound into the signature. This leads to a set of attacks where the certificate used to verify the signature is altered leading to possible incorrect results. This document describes these attacks and provides ways to deal with some of the attacks.


Jim Schaad (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)