Paging message encryption
First Claim
1. A paging terminal for secure radio frequency (RF) paging communications comprising:
- receiving means for receiving message information;
encoding means for encoding the message information into data comprising a plurality of symbols;
control means for determining whether the message information is numeric information or alphanumeric information;
encryption means coupled to the encoding means and the control means for encrypting the data by adding a first predetermined number of additional symbols to the data to form an encrypted message if the control means determines that the message information is numeric information and for encrypting the data by adding a second predetermined number of additional symbols to the data to form the encrypted message if the control means determines that the message information is alphanumeric information; and
transmission means for modulating the encrypted message to form a paging signal and for transmitting the paging signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A paging receiver (15) for receiving secure radio frequency (RF) communications comprises a receiver circuit (102) for receiving and demodulating a signal to obtain information. A memory device (108) is coupled to the receiver circuit (102) for storing the information. A de-encrypter (110) is coupled to the memory device (108) for de-encrypting the information and a decoder (112) is coupled to the de-encrypter (110) for decoding the de-encrypted information to derive a message. User input controls (120) selectably generate a user input signal. A controller (114) is coupled to the memory device (108) and the user input controls (120) for causing the memory device (108) to provide the information stored therein to the de-encrypter (110) in response to the user input signal being equivalent to a predetermined de-encryption signal.
28 Citations
18 Claims
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1. A paging terminal for secure radio frequency (RF) paging communications comprising:
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receiving means for receiving message information; encoding means for encoding the message information into data comprising a plurality of symbols; control means for determining whether the message information is numeric information or alphanumeric information; encryption means coupled to the encoding means and the control means for encrypting the data by adding a first predetermined number of additional symbols to the data to form an encrypted message if the control means determines that the message information is numeric information and for encrypting the data by adding a second predetermined number of additional symbols to the data to form the encrypted message if the control means determines that the message information is alphanumeric information; and transmission means for modulating the encrypted message to form a paging signal and for transmitting the paging signal. - View Dependent Claims (2, 3, 4)
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5. A paging receiver for receiving secure radio frequency (RF) paging communications comprising:
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receiver means for receiving and demodulating a paging signal to obtain paging information; first memory means coupled to said receiver means for storing said paging information; de-encryption means coupled to said first memory means for de-encrypting said paging information to derive de-encrypted information; decoding means coupled to said de-encryption means for decoding said de-encrypted information to derive a message; user input means for selectably generating a user input signal; and control means coupled to said first memory means and said user input means for causing said first memory means to provide said paging information stored therein to said de-encrypting means in response to said user input signal being equivalent to a predetermined de-encryption signal. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification