Hi Jochen,

this is a very important point.
Every application is adopting two factor authentication with OTP. This is 
great - we always hoped for such a security awareness.
But the important difference is: 
The common webapplication that finally will implement TOTP ("this cloudy 
algorithm which was invented by the Google Authenticator" ;-) ) manages the 
seeds/keys for these tokens. If the user uses a smartphone app the user 
will end up with an "OTP token" or "profile" in his App for every 
application.

Or he has to share the seeds one seed between all applications. And then he 
runs into the troubles mentioned earlier.

You perfectly pointed out, why you need a central authentication system for 
managing the second factors.
>From a user experience point fo view the applications could also go for 
U2F. Then the user again will only have one device, which he needs tor 
register with each application...
...but there will be no "syncing" problem.

Kind regards
Cornelius


Am Donnerstag, 29. Dezember 2016 20:45:34 UTC+1 schrieb Jochen Hein:
>
> Martin Basti <m....@redhat.com <mba...@redhat.com>> writes: 
>
>
> >>    But providing access to a Yubico Token via privacyidea works for all 
> >>    cases I have in mind. 
> > 
> > How they are checking the valid tokes if they don't use its counter? 
>
> Privacyidea is the "owner" of the token and has the secret and the 
> counter stored. Every other system (e.g. pam_yubico or FreeIPA) is 
> checking the validation against privacyiadea, either with the yubico 
> protocol, the privacyidey validation, or RADIUS. 
>
> Does this clarify the architecture of my system? 
>
> Jochen 
>
> -- 
> The only problem with troubleshooting is that the trouble shoots back. 
>
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