Re: [Sip] comments on draft-kupwade-sip-iba-00
Eric Rescorla <ekr@networkresonance.com> Wed, 27 February 2008 06:11 UTC
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Date: Tue, 26 Feb 2008 22:12:36 -0800
From: Eric Rescorla <ekr@networkresonance.com>
To: Dean Willis <dean.willis@softarmor.com>
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Cc: IETF SIP List <sip@ietf.org>
Subject: Re: [Sip] comments on draft-kupwade-sip-iba-00
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At Tue, 26 Feb 2008 22:08:46 -0800, Eric Rescorla wrote: > > At Tue, 26 Feb 2008 23:55:22 -0600, > Dean Willis wrote: > > Here's a novel thing: > > > > Let's say I know your identity is sip:ekr@networkresonance.com, and > > that your relationship with the PKG allows you to retrieve keys for > > parameterized versions of that identity. > > > > I can construct a new cryptographic identity for you, perhaps "sip:ekr@networkresonance.com;ID=2009121222 > > " and use that to sign a message to you. You've never seen this > > identity before and don't yet even have the private key for it. You > > then go to your PKG and retrieve said key and use it to verify the > > message. > > Yes, this is a commonly discussed in the IBE world, but it doesn't > work as well with store-and-forward signature systems because the > relying party has no opportunity to insist that you provide an > identity of his choice. Oh, I should mention: what's the value of needing a new key to *verify* the message? What does that do for the sender? The relying party can simply assume the signature is valid. If the sender wants to force the recipient to have a new key, they need to encipher the whole message or require a signed receipt from the recipient. -Ekr _______________________________________________ Sip mailing list https://www.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use sip-implementors@cs.columbia.edu for questions on current sip Use sipping@ietf.org for new developments on the application of sip
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Harsh Kupwade
- [Sip] comments on draft-kupwade-sip-iba-00 Jonathan Rosenberg
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Eric Rescorla
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Dean Willis
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Eric Rescorla
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Eric Rescorla
- Re: [Sip] comments on draft-kupwade-sip-iba-00 James M. Polk
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Eric Rescorla
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Eric Rescorla
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Harsh Kupwade
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Eric Rescorla
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Harsh Kupwade
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Eric Rescorla
- Re: [Sip] comments on draft-kupwade-sip-iba-00 James M. Polk
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Dean Willis
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Dean Willis
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Eric Rescorla
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Eric Rescorla
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Michael Thomas
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Michael Thomas
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Harsh Kupwade
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Eric Rescorla
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Hadriel Kaplan
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Dean Willis
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Dean Willis
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Dean Willis
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Eric Rescorla
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Dean Willis
- Re: [Sip] comments on draft-kupwade-sip-iba-00 Eric Rescorla