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19.6 Summary
Key management sockets are used to communicate SAs to the kernel, key management daemons, and to other security consumers such as routing daemons. SAs can be installed statically or dynamically via a key negotiation protocol. Dynamic keys can have associated lifetimes; when the soft lifetime is reached, the key management daemon is informed. If an SA is not replaced before the hard lifetime is reached, the SA can no longer be used.Ten messages are exchanged between the process and kernel on key management sockets. Each message type has associated extensions, some required and some optional. Each message that is sent by a process is echoed to all other open key management sockets, removing any extensions containing sensitive data.
