Cryptography – Electric signal modification – Having production of printed copy
Patent
1985-04-24
1991-01-01
Buczinski, Stephen C.
Cryptography
Electric signal modification
Having production of printed copy
380 10, 380 25, 358 84, 358 86, 455 2, 455 5, 455 6, H04L 900
Patent
active
049824309
ABSTRACT:
Apparatus and a method are disclosed to enable on-line modification and upgrading of terminal software in a communication network while maintaining the integrity of communication between a service provider and a subscriber using the network. Software is downloaded on a booter channel on the communication network. A subscriber terminal, coupled to the network initiates a communication with the network to receive downloaded booter data. The downloaded data is stored, and a checksum is computed from at least a portion of the downloaded data. The checksum is tested for validity, and control of the subscriber terminal is released to the downloaded software only if the checksum is valid.
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Conover Richard D.
Frezza William A.
Kaufman David
Buczinski Stephen C.
General Instrument Corporation
Gregory Bernarr Earl
Lipsitz Barry R.
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