2.2 Message Syntax
The CredSSP Protocol introduces the TSRequest message, section 2.2.1. The client and server use this message to encapsulate the SPNEGO tokens and TSCredentials message, section 2.2.1.2, that the client SHOULD<5> use to delegate the user's credentials to the CredSSP server over a TLS connection. These messages are encoded by using ASN.1 (as specified in [X690]) and Distinguished Encoding Rules (DER).<6>