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As with any security protocol, when you use IPSec you must provide key management, such as supplying a means of negotiating with other people the protocols, encryption algorithms, and keys to be used in data exchange. In addition, IPSec requires that you keep track of all such agreements between the entities. IETF s IPSec working group has specified that compliant systems must support both manual and automated SA and cryptographic key management.
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Following are brief descriptions of these techniques:
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Manual Manual key and SA management are the simplest forms of key management. A person (usually a systems administrator) manually configures each system, supplying the keying material and SA management data relevant to secure communication with other systems. Manual techniques can work effectively in small, static environments, but this approach is not very practical for larger networks. Automated By using automated key management protocols, you can create keys as needed for your SAs. Automated management also gives you a great deal of scalability for larger distributed systems that are still evolving. You can use various protocols for automated management, but IKE seems to have prevailed as the current industry standard.
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IKE is not a single protocol; rather, it is a hybrid of two protocols. IKE integrates the Internet Security Association and Key Management Protocol (ISAKMP) with the Oakley key exchange protocol. IKE performs its services in two phases. In the first phase, two IKE peers establish a secure, authenticated channel for communication by using a common IKE security association. IKE provides three modes of exchanging keying information and setting up SAs (see next section); in this first phase, only main or aggressive mode is employed. In the second phase, SAs are negotiated on behalf of services such as IPSec or any other service that needs keying material or parameter negotiation. The second phase is accomplished via a quick mode exchange.
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IKE s main mode provides a three-stage mechanism for establishing the first-phase IKE SA, which is used to negotiate future communications. In this mode, the parties agree on enough things (such as authentication and confidentiality algorithms, hashes, and keys) to be able to communicate securely long enough to set up an SA for future communication. In this mode, three two-way messages are exchanged between the SA initiator and the recipient. As shown in Figure 7-11, in the first exchange, the two parties agree on basic algorithms and hashes. In the second, they exchange public keys for
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Figure 7-11 Transactions in IKE s main mode
a Diffie-Hellman exchange and pass each other nonces (random numbers signed and returned by the other party to prove its identity). In the third exchange, they verify those identities.
Aggressive Mode
Aggressive mode is similar to main mode in that aggressive mode is used to establish an initial IKE SA. However, aggressive mode differs in the way the messages are structured, thereby reducing the number of exchanges from three to two. In aggressive mode, the proposing party generates a Diffie-Hellman pair at the beginning of the exchange and does as much as is practical with that first packet: proposing an SA, passing the Diffie-Hellman public value, sending a nonce for the other party to sign, and sending an ID packet that the responder can use to check the initiator s identity with a third party (see Figure 7-12). The responder then sends back everything needed to complete the exchange. All that s left for the initiator to do is to confirm the exchange. The advantage of aggressive mode is its speed, although aggressive mode does not provide identity protection for the communicating parties. This means that the parties exchange identification information before
Figure 7-12
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Aggressive mode transactions
establishing a secure SA in which to encrypt it. As a result, someone monitoring an aggressive mode exchange can identify the entity that has just formed a new SA.
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