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Re: [Cfrg] Re-review of the four balanced PAKEs

Björn Haase <bjoern.haase@endress.com> Fri, 25 October 2019 12:37 UTC

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From: Björn Haase <bjoern.haase@endress.com>
To: "Scott Fluhrer (sfluhrer)" <sfluhrer@cisco.com>, "cfrg@irtf.org" <cfrg@irtf.org>
Thread-Topic: Re-review of the four balanced PAKEs
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Date: Fri, 25 Oct 2019 12:36:46 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/cfrg/rwyFcafWVG1NYAZhGMXnOqWCs0E>
Subject: Re: [Cfrg] Re-review of the four balanced PAKEs
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Dear Scott,


>SPAKE-2 is better than CPACE in the sense that it is a single round protocol (and so can be used as a drop-in replacement for

>DH, assuming some hooks for exchanging identities), and so would be slightly easier to use in a protocol; CPACE requires a

> key confirmation to be sent after the exchange (possibly along with the first encrypted message).

> On the other hand, I wouldn’t expect that a protocol would have a major issue with the extra message that CPACE requires.



Regarding the complexity of the session-ID establishment, Ran Canetti has recently provided a very helpful input on this list. As a result, I conclude that an additional round-trip for sid-establishment could be avoided.



I am working on a document that considers this aspect more in detail and also provides a suggestion regarding the API interface that has equally been suggested by Ran. I.e. in the case of CPace/AuCPace there might be an API that might provide the link between a possible TLS1.3 instantiation of CPace and a higher-level protocol, such as AuCPace where some protocol steps might be included in a operating-system component such as PAM on Linux.



Yours,



Björn.


Mit freundlichen Grüßen I Best Regards 

Dr. Björn Haase 

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