Data communications

Details Data communications Data communications

2007-04-24

2007-04-24

Barrón, Jr., Gilberto (Department: 2135)

Cryptography

Communication system using cryptography

C380S262000

Reexamination Certificate

active

09555929

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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