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Should I use Membership UserID or My Primary Key

Posted on 2010-08-31
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Last Modified: 2013-11-08
I am using asp.net 3.5 with the membership provider.
I added all the provider tables to my existing database using Aspnet_regsql.exe.
I added the userid, which is the data type uniqueidentifier, from the asp.net_users table generated by the membership provider, to my top level table.
The top level table primary key/identity key, is an int (PersonID). Since I used this primary key (PersonID) to relate tables in my original database, before adding membership provider, I just added the userid from the asp.net_users table, to my top level table.

Persons table
PersonID int Identity
UserID uniqueidentifier

Other Tables use PersonID as their FK.

Since this is a web app, I wanted to be sure that, for security reasons, using the PersonID was ok, or if I should change my tables to use the userid/uniqueidentifier instead of the PersonID as the FK.

Thanks
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Question by:Sheritlw
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bhess1 earned 500 total points
ID: 33571654
Depends on where you are using it.  If you place the PersonID on a link in your web code, it may make it easier to hack the system in some cases. If I had the option, I would use PersonID internally, and the guid externally (where it could be hacked).  
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by:Sheritlw
ID: 33572547
Thank you bhess1.

I will change the relationship fk to the user id.
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