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lifetime
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... Section 7 reviews a variety of operational considerations including
key generation, lifetime, and storage.
...
...
While key lifetime is a matter of local policy, these considerations
suggest that no zone key should have a lifetime ...
... lifetime is a matter of local policy, these considerations
suggest that no zone key should have a lifetime significantly over
four years. A reasonable maximum lifetime for zone keys ...
... zone key should have a lifetime significantly over
four years. A reasonable maximum lifetime for zone keys that are
kept off-line ...
... kept off-line and carefully guarded is 13 months with the intent that
they be replaced every year. A reasonable maximum lifetime for end
entity and useer keys that are used for IP-security ...
... are kept on line is 36 days with the intent that they be replaced
monthly or more often. In some cases, an entity key lifetime of
somewhat over a day may be reasonable.
...
...
It is recommended that signature lifetime be a small multiple of the
TTL but not less than a reasonable re-signing ...