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Suppose a server use digital signature to prove the files it sends to users. If someone steals the secret key in the server, what should it do?

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up vote 6 down vote accepted

The key needs to be revoked, the server nuked from orbit, and a new system with a new key put into place.

To go further, this is why you want your master signing key to be offline and trust in your servers' certs based on that chain.

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