Kathryn E Smith

US Patent:

56152647, Mar 25, 1997

Filed:

Jun 8, 1995

Appl. No.:

8/488494

Inventors:

Gregory J. Kazmierczak - Plainsboro NJ
John R. Michener - Neshanic Station NJ
Kathryn M. Smith - Somerville NJ

Assignee:

Wave Systems Corp. - New York NY

International Classification:

H04L 900
H04L 932

US Classification:

380 4

Abstract:

The disclosed system relates to metered use cryptographic systems, and particularly to a data package and system operation for effecting metered purchases of encrypted data from a local encrypted database. A local CD ROM encrypted database includes one or more data package records containing one or more message keys encrypted under a database key, and one or more data packages encrypted under said message keys. The user decrypts portions of the database, and the data used is metered locally and recorded as a stored data usage record. The local stored data usage record is reported by telephone modem or other telecommunications link from a remote user terminal, such as a host personal computer containing a remote cryptographic control unit, to a cryptographic operations center. A second embodiment of an encrypted database for use in accordance with the present invention includes a header containing a message key encrypted under said database key, one or more subunit message keys encrypted under said message key, and a subunit data package encrypted under each said subunit message key. The subunit message key is selected to save storage space.

US Patent:

57647623, Jun 9, 1998

Filed:

Oct 28, 1996

Appl. No.:

8/736851

Inventors:

Gregory J. Kazmierczak - Plainsboro NJ
John R. Michener - Neshanic Station NJ
Kathryn M. Smith - Somerville NJ

Assignee:

Wave System Corp. - New York NY

International Classification:

H04L 900
H04L 932

US Classification:

380 4

Abstract:

The disclosed system relates to metered use cryptographic systems, and particularly to a data package and system operation for effecting metered purchases of encrypted data from a local encrypted database. A local CD ROM encrypted database includes one or more data package records containing one or more message keys encrypted under a database key, and one or more data packages encrypted under said message keys. The user decrypts portions of the database, and the data used is metered locally and recorded as a stored data usage record. The local stored data usage record is reported by telephone modem or other telecommunications link from a remote user terminal, such as a host personal computer containing a remote cryptographic control unit, to a cryptographic operations center. A second embodiment of an encrypted database for use in accordance with the present invention includes a header containing a message key encrypted under said database key, one or more subunit message keys encrypted under said message key, and a subunit data package encrypted under each said subunit message key. The subunit message key is selected to save storage space.