How to verify SSN?

Hi,

Does anybody know the alogirthm to verify a USA SSN (Social Security Number)?

I am making a web form and I need to verify user entries before they can proceed.

I was able to verify the Canadian SIN (Social Insurance Number) as I found the algorithm on the net. But no luck with SSN.

Please help.

thanks.

Maybe this will help.

Thank you,

this did kinda help although the first link is dead :(

thanks.

Only the Social Security Number Format link is dead although unfortunately that is probably an important one.

It is indeed :)
thanks though

The missing page has a new address:
http://www.ssa.gov/history/ssn/ssncards.html

This link tells how to validate the format, but not the authenticity:

http://www.vb2themax.com/Item.asp?Pa...Cat=101&ID=618