KDF definition and goal [was: [Cfrg] Fwd: Hash-Based Key Derivation]
David Wagner <daw@cs.berkeley.edu> Fri, 28 October 2005 17:08 UTC
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From: David Wagner <daw@cs.berkeley.edu>
Message-Id: <200510281708.j9SH8TMm005570@taverner.CS.Berkeley.EDU>
Subject: KDF definition and goal [was: [Cfrg] Fwd: Hash-Based Key Derivation]
To: cfrg@ietf.org
Date: Fri, 28 Oct 2005 10:08:29 -0700
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Dan Bernstein writes: >David Wagner writes: >> The Leftover Hash Lemma requires that >> the 2-universal hash be chosen randomly. You have specified a scheme >> where we use a single hash function that has been fixed in advance -- >> but then the Leftover Hash Lemma is not applicable. > >The hash function has to be chosen randomly, and has to be independent >of all the other random choices in the protocol, but this doesn't mean >that the choice has to wait until the last possible moment! A single >random hash function can be standardized and reused for many keys. The hash function also has to be independent of the adversary's choices. If you pick and reveal the hash function first, and the adversary chooses their values afterwards (and those values are processed with the hash function you picked), all bets are off. Did I get that right? _______________________________________________ Cfrg mailing list Cfrg@ietf.org https://www1.ietf.org/mailman/listinfo/cfrg
- KDF definition and goal [was: [Cfrg] Fwd: Hash-Ba… David Wagner
- Re: KDF definition and goal [was: [Cfrg] Fwd: Has… David McGrew
- KDF definition and goal [was: [Cfrg] Fwd: Hash-Ba… David Wagner
- KDF definition and goal [was: [Cfrg] Fwd: Hash-Ba… David Wagner
- Re: KDF definition and goal [was: [Cfrg] Fwd: Has… D. J. Bernstein
- Re: KDF definition and goal [was: [Cfrg] Fwd: Has… David McGrew
- RE: KDF definition and goal [was: [Cfrg] Fwd: Has… Simon Blake-Wilson
- KDF definition and goal [was: [Cfrg] Fwd: Hash-Ba… David Wagner
- [Cfrg] Re: Extractors/KDF definition and goal csjutla
- KDF definition and goal [was: [Cfrg] Fwd: Hash-Ba… David Wagner
- RE: KDF definition and goal [was: [Cfrg] Fwd: Has… Simon Blake-Wilson
- RE: KDF definition and goal [was: [Cfrg] Fwd: Has… Daniel Brown
- KDF definition and goal [was: [Cfrg] Fwd: Hash-Ba… David Wagner
- KDF definition and goal [was: [Cfrg] Fwd: Hash-Ba… David Wagner
- KDF definition and goal [was: [Cfrg] Fwd: Hash-Ba… David Wagner
- KDF definition and goal [was: [Cfrg] Fwd: Hash-Ba… David Wagner
- Re: KDF definition and goal [was: [Cfrg] Fwd: Has… D. J. Bernstein
- KDF definition and goal [was: [Cfrg] Fwd: Hash-Ba… David Wagner
- Re: KDF definition and goal [was: [Cfrg] Fwd: Has… D. J. Bernstein
- KDF definition and goal [was: [Cfrg] Fwd: Hash-Ba… David Wagner
- Re: KDF definition and goal [was: [Cfrg] Fwd: Has… D. J. Bernstein
- KDF definition and goal [was: [Cfrg] Fwd: Hash-Ba… David Wagner
- Re: KDF definition and goal [was: [Cfrg] Fwd: Has… John Wilkinson
- KDF definition and goal [was: [Cfrg] Fwd: Hash-Ba… David Wagner
- Re: KDF definition and goal [was: [Cfrg] Fwd: Has… D. J. Bernstein
- KDF definition and goal [was: [Cfrg] Fwd: Hash-Ba… David Wagner
- Re: KDF definition and goal [was: [Cfrg] Fwd: Has… canetti