[Cfrg] [CFRG] Pake Selection process

[Björn Haase <[e-mail]>]

Hello to all,

before leaving on vacation, I have two contributions regarding the PAKE selection process.


1.) I today have added a number of slides regarding our Experience at E+H regarding the integration of augmented PAKE into our wireless service acess APPs.

https://github.com/BjoernMHaase/fe25519/blob/master/Concept_For_Modularized_PAKE_integration_into_TLS_20190726.pdf

(Today I did add a number of additional slides to the older presentation that was mentioned yesterday. For reference, I did keep the older version on the server at
https://github.com/BjoernMHaase/fe25519/blob/master/Concept_For_Modularized_PAKE_integration_into_TLS_20190720.pdf )


2.) I see the need to rectify an assessment in our responses to CFRG regarding the protocol properties of AuCPace / CPace in https://eprint.iacr.org/2018/286.pdf when dealing with quantum-computing.

We did write:

“AuCPace has not been analyzed with respect to adversaries able to calculate the discrete logarithm ("quantum adversaries"). Anything we could give here in absence of a clear security model is somewhat hand-waving.  […] For this setting, we believe that for passive adversaries, we would not be having any additional capabilities of a "quantum-adversary", since for passive adversaries we still would be having information-theoretic security for the GuessK problem from section 4.3”

The last sentence was not correct. In fact a quantum adversary could always mount a “quantum dictionary attack” and this does not only apply to active adversaries only but also holds for passive adversaries.



Mit freundlichen Grüßen I Best Regards 

Dr. Björn Haase 

Senior Expert Electronics | TGREH Electronics Hardware
Endress+Hauser Conducta GmbH+Co.KG | Dieselstrasse 24 | 70839 Gerlingen | Germany
Phone: [phone] | Fax: [phone]
[e-mail] |  www.conducta.endress.com 



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