Document write-up for draft-ietf-ipsecme-dh-checks-03

1. Summary

This is a document writeup for draft-ietf-ipsecme-dh-checks-03, prepared by 
Paul Hoffman for Sean Turner.

The document corrects a problem found well after RFC 5996 was published. 
Implementations that support elliptic curves and DSA, and also reuse private 
keys, are vulnerable to some attacks that can be prevented by some simple 
checking. This document specifies the circumstances where the attack might 
happen and how to prevent them.

This document is appropriate for Standards Track because, if the attack had 
been known and understood when RFC 5996 was written, it would certainly have 
been part of that document.

2. Review and Consensus

The document was reviewed by enough active developers and 
cryptographically-inclined participants to be sufficient for Standards Track. 
There is definite consensus to publish.

3. Intellectual Property

Both authors have stated that their direct, personal knowledge of any IPR 
related to this document has already been disclosed, in conformance with BCPs 
78 and 79. There was no WG discussion about any IPR disclosures regarding this 
document.

--Paul Hoffman
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