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The scheme that is implemented in at least one commercial DBMS that I know uses two keys, let's call them the master key and the database key. The master key is used to encrypt the database key. The database key, which could be of a higher grade, is used to encrypt and decrypt the backup images. The master key can be safely rotated, because it only ...


Use gpg (GnuPG). You'll be able to generate multiple keys and encrypt a file for decryption with any key from chosen list. Also GPG keys are not symmetric — your server only need public keys for encryption. Private keys, used for decryption, might be securely stored somewhere else. You can for example print one private key as QRcode for your director and ...

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