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In order to retrieve a key that has been lost during its use (due to equipment failure or forgotten passwords, for example), a secure backup copy should be made available. Backup keys can be stored in a protected form on external media (CD, USB drive, etc.) or by using an existing traditional backup solution (local or networked). When a __________ is being backed up, it must be encrypted and stored.

symmetric key

public key

symmetric key or an asymmetric private key

asymmetric private key



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