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7.2 Key Storage Connected: An Internet Encyclopedia
7.2 Key Storage

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7.2 Key Storage

7.2 Key Storage

It is recommended that zone private keys and the zone file master copy be kept and used in off-line non-network connected physically secure machines only. Periodically an application can be run to add authentication to a zone by adding SIG and NXT RRs and adding no-key type KEY RRs for subzones where a real KEY RR is not provided. Then the augmented file can be transferred, perhaps by sneaker-net, to the networked zone primary server machine.

The idea is to have a one way information flow to the network to avoid the possibility of tampering from the network. Keeping the zone master file on-line on the network and simply cycling it through an off-line signer does not do this. The on-line version could still be tampered with if the host it resides on is compromised. For maximum security, the master copy of the zone file should be off net and should not be updated based on an unsecured network mediated communication.

Note, however, that secure resolvers must be configured with some trusted on-line public key information (or a secure path to such a resolver) or they will be unable to authenticate.

Non-zone private keys, such as host or user keys, generally have to be kept on line to be used for real-time purposes such as DNS transaction security, IPSEC session set-up, or secure mail.


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Connected: An Internet Encyclopedia
7.2 Key Storage

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