Re: Comments on draft-ietf-kitten-krb5-gssapi-prf-03.txt
Sam Hartman <hartmans-ietf@mit.edu> Wed, 01 June 2005 20:28 UTC
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To: "Blumenthal, Uri" <uri.blumenthal@intel.com>
References: <3DEC199BD7489643817ECA151F7C5929012EB35C@pysmsx401.amr.corp.intel.com> <20050523184637.GE27516@binky.Central.Sun.COM>
From: Sam Hartman <hartmans-ietf@mit.edu>
Date: Wed, 01 Jun 2005 16:28:25 -0400
In-Reply-To: <20050523184637.GE27516@binky.Central.Sun.COM> (Nicolas Williams's message of "Mon, 23 May 2005 13:46:37 -0500")
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Subject: Re: Comments on draft-ietf-kitten-krb5-gssapi-prf-03.txt
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>>>>> "Nicolas" == Nicolas Williams <Nicolas.Williams@sun.com> writes: Nicolas> On Mon, May 23, 2005 at 02:13:55PM -0400, Blumenthal, Uri Nicolas> wrote: >> Sounds fine. Do we want to elaborate, like explain that since >> PRF is a PSEUDO-random function, it does have a [usually rather >> long] cycle after which the values start repeating, and we're >> trying to avoid it? Nicolas> I don't care -- as long as we get done with this pair of Nicolas> I-Ds :) Nicolas> Also, I'm not sure that the period is the issue here -- Nicolas> for each call the periodicity issue is handled already in Nicolas> section 2. The issue is that at some point a PRF can Nicolas> start leaking data. I imagine GSS_Pseudo_random() being Nicolas> used to make an XOR encryption pad, for example -- after Nicolas> a while but well before the underlying PRG/PRF's period Nicolas> is reached we may have other weaknesses in it leak Nicolas> information through the pad, parts of which might be Nicolas> recoverable by attackers that know any of the plaintext Nicolas> being encrypted. IANAC, but this seems difficult to Nicolas> explain, particularly in the generic function definition, Nicolas> rather than in the mechanims'. Hmm, I'd consider using a PRF to construct a stream cipher a fine use of a PRF if a bit odd in GSS. I'd certainly expect reasonable crypto to deal appropriately in this case. Nicolas> So I think vague text is the best I can do here, though I Nicolas> welcome suggestions -- I'm sure others can do better than Nicolas> :) I agree vague text is the answer. I'd recommend avoiding specific numbers. _______________________________________________ Kitten mailing list Kitten@lists.ietf.org https://www1.ietf.org/mailman/listinfo/kitten
- Comments on draft-ietf-kitten-krb5-gssapi-prf-03.… Jeffrey Altman
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Jeffrey Hutzelman
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Nicolas Williams
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Jeffrey Altman
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Jeffrey Hutzelman
- RE: Comments on draft-ietf-kitten-krb5-gssapi-prf… Blumenthal, Uri
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Nicolas Williams
- RE: Comments on draft-ietf-kitten-krb5-gssapi-prf… Blumenthal, Uri
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Ken Raeburn
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Nicolas Williams
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Nicolas Williams
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Ken Raeburn
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Nicolas Williams
- RE: Comments on draft-ietf-kitten-krb5-gssapi-prf… Blumenthal, Uri
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Nicolas Williams
- RE: Comments on draft-ietf-kitten-krb5-gssapi-prf… Salowey, Joe
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Nicolas Williams
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Jeffrey Hutzelman
- RE: Comments on draft-ietf-kitten-krb5-gssapi-prf… Blumenthal, Uri
- RE: Comments on draft-ietf-kitten-krb5-gssapi-prf… Jeffrey Hutzelman
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Nicolas Williams
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Martin Rex
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Nicolas Williams
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Sam Hartman
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Martin Rex
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Nicolas Williams
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Nicolas Williams
- Consensus call was Re: Comments on draft-ietf-kit… Jeffrey Altman
- Re: Comments on draft-ietf-kitten-krb5-gssapi-prf… Sam Hartman
- Re: Consensus call was Re: Comments on draft-ietf… Sam Hartman
- Re: Consensus call was Re: Comments on draft-ietf… Nicolas Williams
- Re: Consensus call was Re: Comments on draft-ietf… Sam Hartman
- Re: Consensus call was Re: Comments on draft-ietf… Nicolas Williams
- Re: Consensus call was Re: Comments on draft-ietf… Nicolas Williams
- Re: Consensus call was Re: Comments on draft-ietf… Jeffrey Altman
- Updated I-Ds submitted, pls begin WGLC (Re: Conse… Nicolas Williams