Passing binary data in SAML Assertion Token

Is it possible to include binary data in an SAML Assertion token such that

the token is used to identify a SOAP client by inclusion of the token in the

SOAP Security Extension header i.e., <wss:security> element?

 

In the SAML spec it seems like there is a way to pass non-XML application

data that may be processed by a receiving party's security service?

 

It is possible to include binary data in SAML token as part of <saml:Attribute> 

and would conforming WSS SOAP Security implementation accept a SAML 

token passed in the SOAP security header with binary token data included in

the Assertion token containing AttributeStatement in binary form?

 

Any help will be appreciated.

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