Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2005-01-04
2005-01-04
Peeso, Thomas R. (Department: 2132)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S182000, C713S189000, C713S193000, C713S152000, C713S152000
Reexamination Certificate
active
06839838
ABSTRACT:
A data management system for managing data on a network in which a client device which requests data management transmits encrypted data obtained by encrypting data by a key for the client device, then a server device receives the encrypted data and stores multi-encrypted data obtained by encrypting the encrypted data by a key for the server device. The client device and the server device respectively have a key encrypted by a key for an authentication management device, and the devices can decrypt the key for the client device and the key for the server device and refer to the decrypted keys by referring to the key for the authentication management device. In this arrangement, when reference to the key for the authentication management device is disabled, the key for the server device cannot be referred to, accordingly, the encrypted data cannot be obtained by decrypting the multi-encrypted data. Further, as the key for the client device cannot be referred to, the data cannot be obtained by decrypting the encrypted data. Accordingly, the disabled reference to the key for the authentication management device is equivalent to disposal of the data.
REFERENCES:
patent: 5864683 (1999-01-01), Boebert et al.
patent: 5873083 (1999-02-01), Jones et al.
patent: 5884312 (1999-03-01), Dustan et al.
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Peeso Thomas R.
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