PERFORMANCE BOUNDS FOR ANALOG SIGNAL ENCRYPTION
International Telemetering Conference Proceedings / October 13-15, 1981 / Bahia Hotel, San Diego, California === It is sometimes desirable to perform analog scrambling on an analog signal rather than digitizing the signal and performing digital encryption and transmission. Analog signal encryption...
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| Language: | en_US |
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International Foundation for Telemetering
1981
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| Online Access: | http://hdl.handle.net/10150/613622 http://arizona.openrepository.com/arizona/handle/10150/613622 |
| Summary: | International Telemetering Conference Proceedings / October 13-15, 1981 / Bahia Hotel, San Diego, California === It is sometimes desirable to perform analog scrambling on an analog signal rather than
digitizing the signal and performing digital encryption and transmission. Analog signal
encryption is usually assumed to offer only a very limited degree of security. However, it
is in fact possible to achieve perfect secrecy (just as is obtained with the one-time pad, for
example) in encrypting an analog signal. The price paid for perfect secrecy is an inevitable
degradation in the quality of the recovered analog signal. Under the constraint of perfect
secrecy, the minimum possible degradation can be specified, at least in principle. This
minimal degradation is a decreasing function of the key size for a fixed length message or
key rate for an ongoing message. This bound on performance is determined by the rate
distortion bounds for optimal digitization of the analog message. |
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