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Client certificates

I am developing a web service that uses SSL client certificates for
authentication. It works fine with self-generated certificates, but our
customer's CA wants specific information about what exactly is needed in the
certificate for it to work.

I've found that including the extended key usage OID for client
authentication allows IIS and .NET to properly treat the certificate as a
client certificate, but are there other possibilities? For example, are there
certain combinations of standard key usage attributes that give the same
effect? I have noticed many certificates that, in the Windows certificate
viewer, list "Proves your identity to a remote computer" without having any
extended key usage field defined, and I don't know what it's looking at in
the certificate to determine that.
Nov 23 '05 #1
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