IDP signs the SAML Assertion

Paul Caskey pcaskey at
Tue Jun 9 20:51:01 UTC 2020

Likely a minor point in this case, but service providers should be looking for signed responses rather than signed assertions, according to the Kantara SAML 2.0 federation interoperability specification [1].

See requirement IIP-SP13:

“Service Providers MUST support the ability to reject unsigned <samlp:Response> elements and SHOULD do so by default.”


From: users <users-bounces at> on behalf of "Lohr, Donald" <lohrda at>
Reply-To: Shib Users <users at>
Date: Tuesday, June 9, 2020 at 3:05 PM
To: Shib Users <users at>
Subject: IDP signs the SAML Assertion

I've a SP vendor asking:

Are you able to go in to your identity provider, go to the service provider configuration, and ensure that the IDP signs the SAML Assertion?

How can I actually prove this or not prove it?



D o n a l d   L o h r

I n f o r m a t i o n   S y s t e m s

J a m e s   M a d i s o n   U n i v e r s i t y

5 4 0 . 5 6 8 . 3 7 3 0
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