I have been selected as the General Area Review Team (Gen-ART) 
reviewer for this draft (for background on Gen-ART, please see 
http://www.alvestrand.no/ietf/gen/art/gen-art-FAQ.html). 
Please wait for direction from your document shepherd 
or AD before posting a new version of the draft. 

Document: draft-krawczyk-hkdf-01
Reviewer: Avshalom Houri
Review Date:  2010-03-02
IESG last call date: 2010-03-02 ?
IESG telechat date: 2010-03-04

Summary: The document is ready for publication as an information RFC (see 
editorial). The document is a a reasonable contribution to the area of 
Internet engineering which is covers.

Major issues:  None

Minor issues:  None

Nits/editorial comments: 

Section 2.2 Step1 :Extract

It is not easy to understand the way that the functions are defined.
For example what is the relationship between:

   PRK = HKDF-Extract(salt, IKM)
and 
   PRK = HMAC-Hash(salt, IKM)

Why Hash is an option?

Thanks
--Avshalom


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