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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsSachiko Uranaka, Masaki Kiyono, Makoto Tatebayashi
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The present invention provides an encryption system, by which it is possible to safely distribute a common crypt key for decrypting data on an encrypted DVD-ROM by simple devices and procedure. A terminal equipment 1 comprises a DVD-ROM drive, means for sending a key data request to a center device via communication line, and means for decrypting the encrypted common crypt key using a combination of a part of BCA data and a membership number. A center device 2 comprises means for authenticate a user by searching a user data base 23 in response to the key data request, means for obtaining BCA data of the user by searching a BCA data base 21, means for obtaining a common crypt key by searching a key data base 22, and means for encrypting and transmitting the common crypt key using a combination of a part of BCA data and a membership number. Because a combination of a part of BCA data already distributed and the membership number is used as a key for encrypting the common crypt key, it is possible to safely encrypt and transmit the common crypt key by simple devices and procedure.
An encryption system, comprising a data encryption device for encrypting data, and an encrypted data decryption device for decrypting the encrypted data, and data that can be transmitted between or received by either or both of said device(s),
Terminal equipment for receiving encrypted data that encrypted by a secret key, said terminal equipment comprising:
A center device for receiving medium ID that was included in medium specific information that is inherent to each portable storage medium, said center device comprising:
Dependencies are inferred from the claim text.