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RFC 2785 on Methods for Avoiding "Small-Subgroup" Attacks

2000-03-07 16:26:27

A new Request for Comments is now available in online RFC libraries.

        RFC 2785

        Title:      Methods for Avoiding the "Small-Subgroup" Attacks
                    on the Diffie-Hellman Key Agreement Method for
        Author(s):  R. Zuccherato
        Status:     Informational
        Date:       March 2000
        Mailbox:    robert(_dot_)zuccherato(_at_)entrust(_dot_)com
        Pages:      11
        Characters: 24415
        Updates/Obsoletes/SeeAlso: None
        I-D Tag:    draft-ietf-smime-small-subgroup-03.txt


In some circumstances the use of the Diffie-Hellman key agreement
scheme in a prime order subgroup of a large prime p is vulnerable to
certain attacks known as "small-subgroup" attacks.  Methods exist,
however, to prevent these attacks.  This document will describe the
situations relevant to implementations of S/MIME version 3 in which
protection is necessary and the methods that can be used to prevent
these attacks. 

This document is a product of the S/MIME Mail Security Working Group
of the IETF.

This memo provides information for the Internet community.  It does
not specify an Internet standard of any kind.  Distribution of this
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Authors, for further information.

Joyce K. Reynolds and Sandy Ginoza
USC/Information Sciences Institute


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