Cellular telephone authentication system using a digital certificate
First Claim
1. A system for determining authorized cellular telephone usage and connecting one or more cellular telephones to a telephone network, said system comprising:
- means located in a cellular telephone for generating an authentication signal that contains a telephone number being called, a call count of the number of telephone calls made and a digital signature of telephone numbers called, and a seed number that may be changed after a specified number of calls have been made;
means located at a site remote from the cellular telephone for verifying the authentication signal;
means located at a site remote from the cellular telephone for comparing portions of the authentication signal to determine if specific portions of the authentication signal have been previously used to determine authorized cellular telephone usage;
means for comparing the authentication signals to determine authorized cellular telephone usage; and
means for connecting the cellular telephone to the network if the authentication signals are verified and specific portions of the authentication signal are verified.
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Accused Products
Abstract
This invention relates to a cellular telecommunications systems that utilizes the telephone number the cellular telephone is calling, with the number of telephone calls placed on that cellular telephone, i.e., call count and a seed number to create a digital certificate of the data. The digital certificate is used to make it more difficult to make unauthorized cellular telephone calls. The seed number may be changed after a predetermined number of calls has been made, i.e. one hundred, one thousand, etc. Thus, the transmission of seed numbers between data centers would be substantially reduced.
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Citations
15 Claims
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1. A system for determining authorized cellular telephone usage and connecting one or more cellular telephones to a telephone network, said system comprising:
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means located in a cellular telephone for generating an authentication signal that contains a telephone number being called, a call count of the number of telephone calls made and a digital signature of telephone numbers called, and a seed number that may be changed after a specified number of calls have been made; means located at a site remote from the cellular telephone for verifying the authentication signal; means located at a site remote from the cellular telephone for comparing portions of the authentication signal to determine if specific portions of the authentication signal have been previously used to determine authorized cellular telephone usage; means for comparing the authentication signals to determine authorized cellular telephone usage; and means for connecting the cellular telephone to the network if the authentication signals are verified and specific portions of the authentication signal are verified. - View Dependent Claims (2, 3, 4, 5)
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6. A system for determining authorized cellular telephone communications between one or more cellular telephones and a base station and connecting the authorized cellular telephone communications to a telecommunications network, said system comprising:
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means contained within the cellular telephone for generating a digital certificate that specifies a telephone number being called, a call count or telephone numbers called and a seed number that may be automatically changed after a specified number of calls have been made; means coupled to the base station for receiving the digital certificate generated by said generating means; means contained in the base station for comparing portions of the digital certificate to determine if specific portions of the digital certificate have been previously used to determine authorized cellular telephone usage, Means contained within the base station for verifying the digital certificate that is unique to the cellular telephone communicating with the base station; and Means contained within the base station for connecting the cellular telephone to the network if the digital certificate and specific portions of the digital certificate are the same. - View Dependent Claims (7, 8, 9, 10)
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11. A method for determining authorized cellular telephone communications between one or more cellular telephones and a base station, and connecting the authorized cellular telephone communications to a telecommunications network, said method comprising the steps of:
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generating a digital certificate in the cellular telephone that includes a telephone number being called, a call count of telephone numbers called, and a seed number that may be automatically changed after a specified number of calls have been made; transmitting the digital certificate; receiving the digital certificate; comparing portions of the digital certificate to determine if specific portions of the digital certificate have been previously used to determine authorized cellular telephone usage; verifying the digital certificate; and connecting the cellular telephone to the network if the digital certificate and specific portions of the digital certificate are the same. - View Dependent Claims (12, 13, 14, 15)
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Specification