Cryptography – Key management – Having particular key generator
Patent
1984-11-08
1987-06-16
Buczinski, Stephen C.
Cryptography
Key management
Having particular key generator
380 17, H04N 7167, H04N 100, H04N 716
Patent
active
046739750
ABSTRACT:
A scrambling apparatus which scrambles a television signal prior to its transmission to prevent interception of the signal by means other than a counterpart descrambler apparatus. The television signal is scrambled by dividing each scan line (a scan line includes its leading sync portion) into first and second portions which are divided by an intermediate picture element. Each line is transmitted as follows: first the intermediate picture element is transmitted followed by the second scan line portion, followed by the first portion which begins with the sync signal and is terminated by retransmission of the intermediate picture element. The position of the intermediate picture element is randomly changed in each successive scan line so that reconstruction of the original television signal becomes exceedingly difficult. In the descrambler (receiver), a random address generator which includes a read only memory which contains the sequence of the position of the intermediate picture element in successive scan lines is used for receiving the scrambled television signal and descrambling the signal and restoring it to its original form for use in standard television receivers.
REFERENCES:
patent: 4070693 (1978-01-01), Shutterly
patent: 4458268 (1984-07-01), Ciciora
patent: 4547802 (1985-10-01), Fogarty et al.
Inaba Masao
Kashigi Kazuo
Buczinski Stephen C.
Koltak Melissa T.
NEC Corporation
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