Dummy traffic generation
First Claim
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1. In a transmitter that transmits first message signals provided by a first signal source, an improvement comprising:
- second signal source means for providing second message signals to the transmitter for at least part of the time when the first message signals are absent, wherein duration of transmissions and time between transmissions of the second message signals are derived from said second message signals.
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Abstract
In a secure communication system, a method for generating dummy traffic to forestall cryptanalytic attack by traffic analysis. Both the dummy traffic signal and certain characteristics of the dummy transmissions, such as duration and inter-transmission delay, are derived from the same source.
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Citations
15 Claims
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1. In a transmitter that transmits first message signals provided by a first signal source, an improvement comprising:
second signal source means for providing second message signals to the transmitter for at least part of the time when the first message signals are absent, wherein duration of transmissions and time between transmissions of the second message signals are derived from said second message signals. - View Dependent Claims (2, 3)
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4. In a secure communication unit having a transmitter and a plurality of other signal sources, an apparatus that provides a bit stream to the transmitter from time to time, wherein the bit stream is transmitted for variable durations and with variable times between transmissions, the apparatus comprising:
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bit generator means for generating the bit stream; at least one variable generator means for generating the variable durations and the variable times between transmissions using the bit stream as input; switch means for selecting among the bit stream and the other signal sources; real time clock and control means for controlling the switch means in response to a combination of the other signal sources and said at least one variable generator means. - View Dependent Claims (5, 6, 7, 8, 9)
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10. In a secure communication unit having a transmitter and a plurality of other signal sources, an apparatus that provides a bit stream to the transmitter from time to time, therein the bit stream is transmitted for variable durations and with variable times between transmissions, the apparatus comprising:
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bit generator means for generating the bit stream; at least one variable generator means for generating the variable durations and the variable times between transmissions using the bit stream as input.
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11. In a secure communication unit having a transmitter and a plurality of other signal sources, a method for providing a bit stream to the transmitter from time to time, wherein the bit stream is transmitted for variable durations and with variable times between transmissions, the method comprising the steps of:
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(a) generating the bit stream; (b) generating the variable durations and the variable times between transmissions using said bit stream as input; and (c) selecting among the bit stream and the other signal sources, for provision to the transmitter, in response to a combination of the other signal sources and the variable durations and times between transmissions generated in step (b). - View Dependent Claims (12, 13, 14, 15)
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Specification