Method and apparatus for transmitting and receiving encrypted signals
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United States of America Patent
Stats
-
Jul 6, 1999
Grant Date -
N/A
app pub date -
Feb 18, 1997
filing date -
Apr 8, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An encrypted signal compatible with first and second encryption systems is generated by producing encryption data signals relating to each encryption system. A difference signal is derived from the two encryption data signals and the signal to be encrypted is encrypted in accordance with one of the encryption systems. At an output the encrypted signal, the two encryption signals, and the difference signal are made available. At a decoder compatible with, for example, the first encryption system, the encrypted data, the second encryption data signal, and the different signal are received. The decoder can then derive the first encryption data signal from the second encryption data signal and the difference signal and can then decode the encrypted signal.
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