Telechat Review of draft-ietf-karp-crypto-key-table-08

Request Review of draft-ietf-karp-crypto-key-table
Requested rev. no specific revision (document currently at 10)
Type Telechat Review
Team Security Area Directorate (secdir)
Deadline 2013-08-13
Requested 2013-08-02
Authors Tim Polk, Russ Housley, Sam Hartman, Dacheng Zhang
Draft last updated 2013-08-08
Completed reviews Genart Last Call review of -07 by David Black (diff)
Genart Telechat review of -08 by David Black (diff)
Secdir Telechat review of -08 by Klaas Wierenga (diff)
Secdir Last Call review of -07 by Klaas Wierenga (diff)
Assignment Reviewer Klaas Wierenga
State Completed
Review review-ietf-karp-crypto-key-table-08-secdir-telechat-wierenga-2013-08-08
Reviewed rev. 08 (document currently at 10)
Review result Has Nits
Review completed: 2013-08-08



After having reviewed version 07, I have only one (minor) nit for version 8, you write:

KDF: A key
       derivation function is a one-way function that provides
       cryptographic separation of key material.  The KDF MAY use
       inputs from the row in the key table and the message being sent
       or received but MUST NOT depend on other configuration state.

I wonder whether that definition is correct. I have always considered forwarding secrecy a desirable but not necessary property for KDF's. For example the key may not have the necessary properties so a transformation may be needed (could be as simple as padding until a certain length). But if you can point me to a definition that includes one-way I stand corrected.