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How authorities save their Private Keys

How do certifying authorities save their Private Keys?

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It is very significant that the private keys of certifying authorities are saved securely since compromise would allow undetectable forgeries. One method is to attain the desired security and is to save the key in a tamper-resistant device. The device must preferably destroy its contents whenever opened, and be shielded against attacks employing electromagnetic radiation. Not even staff of the certifying authority must have access to the private key itself, however only the capability to use the private key in the procedure of issuing certificates.

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