Find more terms and definitions using our Dictionary Search. Internet key exchange IKE appears in:. Handbook of Research on Wireless Security Search inside this book for more research materials. Recommend to a Librarian Recommend to a Colleague. Looking for research materials? Search our database for more Internet key exchange downloadable research papers. Full text search our database of , titles for Internet key exchange IKE to find related research papers.
Establishing Cyber Security Programs Through As society continues to heavily rely on software a In Stock. It can also be described as a method for exchanging keys for encryption and authentication over an unsecured medium, such as the Internet. IKE is a hybrid protocol based on:. IKE enhances IPsec by providing additional features along with flexibility. IPsec, however, can be configured without IKE. IKE has many benefits. It eliminates the need to manually specify all the IPSec security parameters at both peers.
It allows the user to specify a particular lifetime for the IPsec security association. Furthermore, encryption can be changed during IPsec sessions. Moreover, it permits certification authority. Finally, it allows dynamic authentication of peers.
The IKE works in two steps. The first step establishes an authenticated communication channel between the peers, by using algorithms like the Diffie-Hellman key exchange, which generates a shared key to further encrypt IKE communications. The communication channel formed as a result of the algorithm is a bi-directional channel. The authentication of the channel is achieved by using a shared key, signatures, or public key encryption.
Manual key exchange—IPsec supports using and exchanging of keys manually example: phone or email on both sides to establish VPN. Phase 2—Negotiate security associations SAs to secure the data that traverses through the IPsec tunnel. Phase 1 of an AutoKey Internet Key Exchange IKE tunnel negotiation consists of the exchange of proposals for how to authenticate and secure the channel. The participants exchange proposals for acceptable security services such as:. See IPsec Overview.
Diffie-Hellman DH group. A successful Phase 1 negotiation concludes when both ends of the tunnel agree to accept at least one set of the Phase 1 security parameters proposed and then process them. Juniper Networks devices support up to four proposals for Phase 1 negotiations, allowing you to define how restrictive a range of security parameters for key negotiation you will accept.
Junos OS provides predefined standard, compatible, and basic Phase 1 proposal sets. You can also define custom Phase 1 proposals. Phase 1 exchanges can take place in either main mode or aggressive mode. You can choose your mode during IKE policy configuration.
In main mode, the initiator and recipient send three two-way exchanges six messages total to accomplish the following services:. First exchange messages 1 and 2 —Proposes and accepts the encryption and authentication algorithms.
Second exchange messages 3 and 4 —Executes a DH exchange, and the initiator and recipient each provide a pseudorandom number. Third exchange messages 5 and 6 —Sends and verifies the identities of the initiator and recipient.
The information transmitted in the third exchange of messages is protected by the encryption algorithm established in the first two exchanges. In aggressive mode, the initiator and recipient accomplish the same objectives as with main mode, but in only two exchanges, with a total of three messages:.
When configuring aggressive mode with multiple proposals for Phase 1 negotiations, use the same DH group in all proposals because the DH group cannot be negotiated. Up to four proposals can be configured. Second message—The recipient accepts the SA; authenticates the initiator; and sends a pseudorandom number, its IKE identity, and, if using certificates, the recipient's certificate.
Third message—The initiator authenticates the recipient, confirms the exchange, and, if using certificates, sends the initiator's certificate. Main and aggressive modes applies only to IKEv1 protocol. IKEv2 protocol does not negotiate using main and aggressive modes. After the participants have established a secure and authenticated channel, they proceed through Phase 2, in which they negotiate security associations SAs to secure the data to be transmitted through the IPsec tunnel.
Similar to the process for Phase 1, the participants exchange proposals to determine which security parameters to employ in the SA. Regardless of the mode used in Phase 1, Phase 2 always operates in quick mode and involves the exchange of three messages. In Phase 2, the peers exchange proxy IDs. A proxy ID consists of a local and remote IP address prefix. The proxy ID for both peers must match, which means that the local IP address specified for one peer must be the same as the remote IP address specified for the other peer.
PFS is a method for deriving Phase 2 keys independent from and unrelated to the preceding keys. A replay attack occurs when an unauthorized person intercepts a series of packets and uses them later either to flood the system, causing a denial of service DoS , or to gain entry to the trusted network.
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