Cryptography – Cryptanalysis
Patent
1992-06-10
1993-09-07
Cain, David C.
Cryptography
Cryptanalysis
380 10, 380 20, H04N 7167
Patent
active
052436470
ABSTRACT:
Apparatus for broadband signal distribution is equipped with a detector for detecting when the apparatus is open and is further adapted to receive an entry code generator. If the entry code generator is not installed or, if installed, fails to generate an entry code which matches an authorized entry code stored in the apparatus, the apparatus enters a particular mode of operation whereby service provided by the apparatus is interfered with. The entry code generator comprises a circuit board for coupling with an electrical connector of the apparatus having at least one ear which precludes closure of a cover to the apparatus. A method of screening access to the apparatus from others than authorized service personnel includes waiting a predetermined period of time for coupling the access code generator before service is interfered with. Furthermore, the stored access code may be changed or the predetermined time varied by addressable command from a headend of a broadband signal distribution system.
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Borsetti, Jr. Paul
Parikh Himanshu
Rustagi Vibha
Schutte Mark E.
Cain David C.
Marvin William A.
Powers, III Frederick W.
Scientific-Atlanta, Inc.
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