The following errata report has been submitted for RFC2631,
"Diffie-Hellman Key Agreement Method".
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You may review the report below and at:
https://www.rfc-editor.org/errata/eid5954
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Type: Technical
Reported by: Paul Janson <silversplash(_at_)gmx(_dot_)com>
Section: 2.1.5.
Original Text
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1. Verify that y lies within the interval [2,p-1]. If it does not,
the key is invalid.
2. Compute y^q mod p. If the result == 1, the key is valid.
Otherwise the key is invalid.
Corrected Text
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1. Verify that y lies within the interval [2,p-1]. If it does not,
the key is invalid.
2. Compute y^q mod p. If the result == 1, the key is valid.
Otherwise the key is invalid.
| 3. Verify that y does not match g.
Notes
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Validating that (g == received y) needs to be an additional exclusion to the
valid range [2,p-1]. If party 'a' accepts received public key 'yb' matching
'g', then ZZ matches public key 'ya'. i.e. if yb = 2, then xb = 1, therefore
ZZ = ya^1 = ya
Instructions:
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RFC2631 (draft-ietf-smime-x942-07)
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Title : Diffie-Hellman Key Agreement Method
Publication Date : June 1999
Author(s) : E. Rescorla
Category : PROPOSED STANDARD
Source : S/MIME Mail Security
Area : Security
Stream : IETF
Verifying Party : IESG
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