Key Management Methods in .NET

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(NAS) through a secure channel it shares with the NAS. Using this keying material, the NAS can later trust the peer to start building a security relationship with that peer. We will provide more detail on that process later, but for now let us state the obvious: if the authenticator acts as the EAP server (two-party authentication model), no key transport is required. Secure association (phase 2): This is the magic part. Based on the keying material (such as the AAA key) received from the EAP server in phase 1b, the authenticator (NAS) can now interact with the peer directly and without the involvement of the EAP server (Figure 3.3) establish security associations for secure communications with the peer without the involvement of the EAP server. Transient session keys (TSK) are the keys that are created during this stage and are used to protect data between the peer and the authenticator according to the cipher suite that is negotiated between the two. Security association protocols may be in place to refresh the generated keys before these keys expire. It should be mentioned that since the authenticator acts as a pass-through during the authentication (phase 1a), the peer and authenticator cannot trust each other during phase 1a. The only thing they have in common is the knowledge of the AAA key, which was derived by the peer and delivered to the authenticator from the EAP server. Hence, before going on and creating session keys, the peer and authenticator needs to establish trust by proving to each other that both possess the same AAA key.
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A final but very important note is that the mutual authentication between the peer and the EAP server happens based on the long-term credentials for both parties. In other words, either they both share a pre-configured secret or they use their private keys in conjunction with their certificates. It should also be mentioned that in this book we try to follow the IETF terminology as closely as possible and therefore could not avoid the unfortunate misnomer that exists around the AAA key. Even though the EAP community refers to the key material created by the EAP server and used by the authenticator to establish a security association with the peer as the AAA key, the Mobile IP community, as we will see later on, calls the long-term secret that the mobile node shares with the AAA server as the AAA key. Now that we described the three phases of the EAP key management process, we should mention the reason behind this phased design approach: the EAP key management process is being designed as a generic framework that needs to be
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Media independence: The key management process includes a capability discovery process that is highly dependent on the specific link technology (PPP, 802.11, Ethernet) being used. Keeping the specifics of each link technology, such as discovery messaging (probe request/responses), information elements, host identifiers (such as MAC address) out of the EAP design, keeps the design of the EAP key management framework a manageable task and makes the specification a long-lasting one. Furthermore, secure association phase may involve negotiation of parameters and cipher suites are specific to a media and have no context for outsiders. Cipher suite independence: EAP key management framework involves two different family of cipher suites: (1) Cipher suites used by EAP authentication methods to protect the EAP conversation between the peer and EAP server; (2) Cipher suites negotiated by the secure association protocol between the peer and authenticator and used for protection of data between the peer and the authenticator. The cipher suites negotiation during secure association phase is performed in a manner that is out of band for EAP conversation and possibly without knowledge of the EAP server. The reason for this approach is to keep the code implemented at the EAP server simple. Otherwise, the EAP server code not only would have to include the implementation of every considered cipher suite but also would have to be upgraded every time a new cipher suite was introduced for media communications protection. Hence, cipher suite independence is another reason for having a phased EAP key management approach, in which the authentication and key materials generated as a result of this authentication, do not depend on the cipher suites implemented between the peer and the authenticator. Handover and multi-port support: With the increasing demand on fast handover, it is important for the peer to move quickly from one authenticator to the next and maintain the proper security standards despite its mobility. In order to fulfill these needs, the EAP server may, after performing a single authentication of the peer, transport the AAA keys to multiple authenticators to help proactive key management.
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The strength of the EAP key management framework in deriving over-the-air communication channel keys, based on pre-existing trust with the AAA server, has been recognized by several standards communities. This strength combined with the flexibility of EAP as an authentication framework to provide support for a generic authentication mechanism has made EAP a powerful candidate for many emerging wireless technologies such as 802.11 security standards [IEEE80211i] and its robust secure network (RSN) [EDARB80211]. We will provide a much more detailed discussion on EAP authentication framework in 10.
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