| 摘要 |
<p>An encryption of a master key is included with each recording of encrypted published material that requires the master key for decryption and subsequent processing. The master key is encrypted using a public key associated with a trusted authority, typically encoded on a smartcard that is associated with each authorized user. Should the smartcard be lost, or the decryption device become inoperative, one of the recordings containing the encrypted master key is sent to the trusted authority for a retrieval of the master key. The trusted authority uses the private key corresponding to the public key that was used to encrypt the master key to determine the master key. In a preferred embodiment, the trusted authority is the vendor of the smartcard or other encryption/decryption device, and provides a replacement smartcard or device containing the retrieved master key, typically for a fee, for subsequent use by the user to decrypt other recorded material in the user's collection.</p> |
