authorization and permissions

Hi All,
I'm development a system, and I have doubts about login (authorization and
permissions)
This system need be very secure.
The systems have clients that connect in a web service and this web service
connects in SQL Server.
My doubt is:
What is the best:
Logins here is: Name and password(hash) and what each user can do.
Store logins in one table in my database and always WebServise use SA
account to manipulate data base?
Use SQL logins for each users?
Use Windows logins for each users?
ThanksHello,
I notice you have posted the same question in our SQLServer newsgroup,
which have been responded. So please check the answers there.
Sophie Guo
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
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