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Time-to-Live
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... Special Considerations With Time-to-Live ...
... signature is verified. This conflicts with our desire to have the
time-to-live field tick down when resource records are cached.
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This could be avoided by leaving the time-to-live out of the digital
signature, but that would allow unscrupulous servers to set
arbitrarily long time to live ...
... arbitrarily long time to live values undetected. Instead, we include
the "original" time-to-live in the signature and communicate that
data in addition to the current time-to-live ...
... time-to-live in the signature and communicate that
data in addition to the current time-to-live. Unscrupulous servers
under this scheme can manipulate the time to live but a security ...