http://www.rfc-editor.org/rfc/rfc3079.txt
RFC 3079: Deriving Keys for use with Microsoft Point-to-Point Encryption (MPPE), G. Zorn2001-03-01T23:00:00-00:00This document describes the method used to derive initial MPPE session keys from a variety of credential types. It is expected that this memo will be updated whenever Microsoft defines a new key derivation method for MPPE, since its primary purpose is to provide an open, easily accessible reference for third-parties wishing to interoperate with Microsoft products. This memo provides information for the Internet community.