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SKEYID_a is the keying material used by the ISAKMP SA to authenticate its messages.
SKEYID_d is the keying material used to derive keys for non-ISAKMP security associations.
It does not claim conformance or compliance with the entire Oakley protocol nor is it dependant in any way on the Oakley protocol.
Likewise, this does not implement the entire SKEME protocol, but only the method of public key encryption for authentication and its concept of fast re-keying using an exchange of nonces.
And see this tutorial online (especially section on "Template-based GENLEX").
See also the paper Steedman for a brief introduction, and Steedman and Baldridge for more details.
This protocol is not dependant in any way on the SKEME protocol.
This does not implement the entire Oakley protocol, but only a subset necessary to satisfy its goals.
For PFS to exist the key used to protect transmission of data MUST NOT be used to derive any additional keys, and if the key used to protect transmission of data was derived from some other keying material, that material MUST NOT be used to derive any more keys.
Perfect Forward Secrecy for both keys and identities is provided in this protocol. A security association (SA) is a set of policy and key(s) used to protect information.
12 5.3 A Revised method of Authentication with Public Key Encryption.
13 5.4 Authentication with a Pre-Shared Key..........................
This document describes a protocol using part of Oakley and part of SKEME in conjunction with ISAKMP to obtain authenticated keying material for use with ISAKMP, and for other security associations such as AH and ESP for the IETF IPsec DOI. The purpose is to negotiate, and provide authenticated keying material for, security associations in a protected manner.