Title:
AUTHENTICATION OF SERVICE IN CONDITIONAL ACCESS SYSTEM
Document Type and Number:
Japanese Patent JP2009273151
Kind Code:
A
Abstract:
To provide a cable TV system which provides conditional access to services.
This cable TV system includes a head end from which service "instances" or programs are broadcasted and a plurality of set-top units which receive the instances and selectively decrypt the instances in order to display them for a system subscriber. The service instances are encrypted by using public keys and/or private keys provided by a service provider or a center authority agent. The keys used by the set top for selective decryption may also have a public or secret characteristic. These keys are allocated again at different points of time. Thus, the cable TV system in which the risk of infringement activities is minimized is provided.
Inventors:
AKINS GLENDON L III
BANKER ROBERT O
PINDER HOWARD G
WASILEWSKI ANTHONY J
BANKER ROBERT O
PINDER HOWARD G
WASILEWSKI ANTHONY J
Application Number:
JP2009188752A
Publication Date:
November 19, 2009
Filing Date:
August 17, 2009
Export Citation:
Assignee:
SCIENTIFIC ATLANTA
International Classes:
G09C1/00; H04L9/08; H04L9/32; H04L29/06; H04N7/16; H04N7/167
Attorney, Agent or Firm:
Hidesaku Yamamoto
Takaaki Yasumura
Natsuki Morishita
Takaaki Yasumura
Natsuki Morishita