[Seaside] authecation question

[Torsten Bergmann]

For a user management see:
http://smalltalkhub.com/#!/~TorstenBergmann/UserManagement

Maybe Lighthouse is a start for your webapp:
http://smalltalkhub.com/#!/~TorstenBergmann/Lighthouse

A premade, ready to run image with the full demo web app using Twitter Bootstrap, Nucleus, I18N, Usermanagement, ...
is at: 

https://ci.inria.fr/pharo-contribution/job/Lighthouse/PHARO=30,VERSION=development,VM=vm/

Have fun
T.