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They seem to be similar on the surface, but I'm not sure how deep the differences are.

Can someone explain to me the difference between SAMLp and WS-Trust? ADFSv2 gives me a choice between these options and I'm not sure which to choose.

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WSTrust is a standard which is specifies how to encrypt/decrypt/sign SOAP messages and how to bind security tokens to a SOAP message.

SAML tokens are an example of a security token that could be bound to a SOAP message.

The SAML protocol provides a standard way to acquire, release and renew SAML tokens using SSL to protect communications and the XmlDsig standard to protect the token.

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SAML P is not SAML protocol but SAML Passive, so I prefer you go for this link http://www.netframeworkdev.com/claims-based-access-platform-cba-codenamed-geneva/protocol-transition-from-saml-20-passive-to-wsfederation-passive-70715.shtml

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Does that mean there aren't security benefits of one over the other? –  makerofthings7 Nov 22 '10 at 17:14
    
In regards to your edit, I believe there are other forms of SAML that ADFSv2 does not support, like Backchannel among others. Siteminder OTOH should handle this. –  makerofthings7 Nov 22 '10 at 21:17
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