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1 Introduction

The Simple and Protected Generic Security Service Application Program Interface Negotiation Mechanism (SPNEGO): Microsoft Extension is an extension to [RFC4178] that provides a negotiation mechanism for the Generic Security Service Application Program Interface (GSS-API), as specified in [RFC2743]. SPNEGO provides a framework for two parties that are engaged in authentication to select from a set of possible authentication mechanisms, in a manner that preserves the opaque nature of the security protocols to the application protocol that uses SPNEGO. SPNEGO was first defined in [RFC2478], which has been superseded by [RFC4178].

Sections 1.8, 2, and 3 of this specification are normative and can contain the terms MAY, SHOULD, MUST, MUST NOT, and SHOULD NOT as defined in [RFC2119]. Sections 1.5 and 1.9 are also normative but do not contain those terms. All other sections and examples in this specification are informative.

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