[Cfrg] WG: Comments on the CPace proof and the CFRG PAKE selection process

[Björn Haase <[e-mail]>]

Dear CFRG, 

after a very productive meeting yesterday with Manuel and Michel there is a clear path forward. Michel, Manuel and me concluded that:

1 - We agree that CPace (when the final hash includes the full communications trace but not the password) can be proved secure with respect to the security definition that is presented in [2], and which is essentially the same as that in [1] restricted to static corruptions.

2 - We concluded that the simulation strategy in [1] is very close to that in [2], which means that the proof in [2] can be adapted to fully justify CPace as above. This will be done for the proceedings version of [2] and then a separate self-contained document will clarify implementation-specific issues that are not explicit in the proof.

Yours,

Björn

[1] https://github.com/BjoernMHaase/AuCPace/blob/master/aucpace_security_analysis_20200208.pdf 
[2] https://eprint.iacr.org/2020/320 


Mit freundlichen Grüßen I Best Regards 

Dr. Björn Haase 


Senior Expert Electronics | TGREH Electronics Hardware

Endress+Hauser Liquid Analysis

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