Data communications

Details Data communications Data communications

2006-02-07

2006-02-07

Smithers, Matthew (Department: 2137)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

Having separate add-on board

C713S170000, C713S171000, C713S172000, C713S173000, C713S174000, C380S239000, C380S262000

Reexamination Certificate

active

06996722

ABSTRACT:
In a data communications system a remote data source outputs data as a series of application data units (ADUs). Each ADU is individually encrypted with a different key. The keys are transmitted (for example using Internet multicasting) via a communications network to one or more customer terminals. At the terminals a sequence of keys is generated for use in decrypting the ADUs. A record is kept of the keys generated, and this record may subsequently be used to generate a receipt for the data received by the customer. The keys may be generated, and the record stored within a secure module such as a smartcard.

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