METHOD FOR ESTABLISHING A RANDOM NUMBER FOR SECURITY AND ENCRYPTION, AND A COMMUNICATIONS APPARATUS
First Claim
1. A method to establish at a mobile device a random number for cryptographic operations comprising the steps of:
- receiving at the mobile device a plurality of signals carrying information including received signals which provides randomly varying data related to location of the mobile device;
estimating signal entropy for at least one of the received signals in dependence of location where the signals are received by the mobile device;
selecting the at least one entropy estimated signal having estimated entropy satisfying a predetermined property; and
generating from the at least one entropy estimated signal the random number.
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Abstract
A communications apparatus includes a mobile device. The apparatus includes a receiver for receiving at the mobile device a plurality of signals carrying information including received signals which provides randomly varying data related to location of the mobile device. The apparatus includes a random number generator which generates a random number as a function of the data. The apparatus includes acryptographickey generator which generates a cryptographic key using the random number. A method to establish at a mobile device a random number for cryptographic operations includes the steps of receiving at the mobile device a plurality of signals carrying information including received signals which provides randomly varying data related to location of the mobile device. There is the step of estimating signal entropy for at least one of the received signals in dependence of location where the signals are received by the mobile device. There is the step of selecting the at least one entropy estimated signal having estimated entropy—satisfying a predetermined property. There is the step of generating from the at least one entropy estimated signal the random number.
35 Citations
23 Claims
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1. A method to establish at a mobile device a random number for cryptographic operations comprising the steps of:
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receiving at the mobile device a plurality of signals carrying information including received signals which provides randomly varying data related to location of the mobile device; estimating signal entropy for at least one of the received signals in dependence of location where the signals are received by the mobile device; selecting the at least one entropy estimated signal having estimated entropy satisfying a predetermined property; and generating from the at least one entropy estimated signal the random number. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A communications apparatus comprising:
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a mobile device; means for transmitting signals; a receiver means for receiving at the mobile device a plurality of signals carrying information including received signals which provides randomly varying data related to location of the mobile device; and means for estimating signal entropy for at least one of the received signals in dependence of location where the signals are received by the mobile device, selecting the at least one entropy estimated signal having a predetermined property, generating from the at least one entropy estimated signal a random number, and using the random number to establish cryptographic operations with the transmitted signals. - View Dependent Claims (13)
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14. A communications apparatus comprising:
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a mobile device; a receiver for receiving at the mobile device a plurality of signals carrying information including received signals which provides randomly varying data related to a location of the mobile device; a random number generator which generates a random number as a function of said varying data; and a key generator which generates a cryptographic key using the random number. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification