Can someone explain the purpose of wss10/wss11 assertions in a security
policy?

I thought their purpose was to express some kind of requirement. But my
tests failed to confirm that. I am using a symmetric binding (with derived
keys) and the only wss11 assertion I have found to be absolutely critical
is sp:MustSupportRefEncryptedKey. Without this assertion, my web service
requests will fail.

On the other hand, my client is free to send requests with
sp:RequireIssuerSerialReference even if my server policy specifies
sp:Wss11/wsp:Policy/sp:MustSupportRefThumbprint.

Thank you,

-- 
Philippe

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