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5798708 |
Message protection radio display paging using confidential code and password
In a radio display paging system, a transmitted paging signal either contains an optional confidential code and a message if the message is confidential or exclusively a non-confidential message....
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5784462 |
Digital signal receiver capable of receiving data encrypted and transmitted in online processing
In a decoding processing circuit of a digital signal receiver, a first comparison circuit detects that a prefix of packet data is inputted in a shift register on the basis of a count value of a...
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5768526 |
Method and apparatus for validating data packets in a paging system
A method of validating communications between a transmitting component and a receiving component of a paging system is disclosed. The transmitting component prepares an application protocol data...
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5729610 |
Radio paging unit
In a radio paging unit, in addition to a display driver, a control system for causing a display section to display message information received via a radio reception section and saved in a message...
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5719918 |
Short message transaction handling system
A transaction handling system (THS) for use in a cellular telephone network using Short Messages is described. The THS comprises means for receiving digitally encoded information from one or more...
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5668876 |
User authentication method and apparatus
Authorization for a user to use a service is provided by a modified pager which calculates a unique response code to a transmitted challenge code based on the challenge code, an input personal...
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5621798 |
Method and apparatus for cooperative messaging
A wireless network is disclosed that comprises base transmitter/receiver stations coupled to a trunk communications network and several mobile computing devices that are capable of transmitting and...
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5541997 |
Method and apparatus for detecting correctly decrypted communications
In a receiver (100), an encrypted communication (104) is decrypted using a decryptor (101) and a key (107) to produce a decrypted communication (105). A comparator (103) compares decrypted symbol...
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5530438 |
Method of providing an alert of a financial transaction
A radio system user (126) is alerted (129) as to the occurrence of a financial transaction by a customer (118). Data (122) is obtained from the customer (118) and used to identify a radio system...
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5483595 |
Paging device including password accessed stored cryptographic keys
A paging device includes a cryptographic function and a password accessed cryptographic key look-up table associating each stored key with a password. When an cryptographic message is collected by...
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5455864 |
Encrypted paging message transmission
A method and apparatus for paging message encryption and decryption is shown and described. Paging messages may be encrypted at their source or by the paging system and delivered by radio signal in...
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5442703 |
Method for identifying corrupt encryption keys within a secure communication system
A resource allocator (108) receives, from a first communication unit, a request to establish secure communications with at least a second communication unit. A key identifier is retrieved by the...
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5404404 |
Method for updating encryption key information in communication units
Within a communication system, updating encryption key information in communication units of a particular communication group begins when a key management terminal transmits a key update message...
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5357571 |
Method for point-to-point communications within secure communication systems
In a secure communication system, a secure point-to-point communication may be accomplished in the following manner. A first communications unit receives a request from an operator for a...
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5325432 |
Method for updating encryption key information in communication units
Within a communication system, an encryption controller receives unit identification information from a plurality of encrypting/decrypting communication units. For any individual communication...
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5285496 |
Methods and apparatus for providing a secure paging system
A paging system which sends and receives encrypted messages. The message may be encrypted either by the sender of the message or by the paging system. Multiple keys may be used for encrypting and...
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5283832 |
Paging message encryption
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...
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5247576 |
Key variable identification method
In a communication system that includes a plurality of communication units, a communication resource allocator, and a limited number of transceivers that transceive information amongst the...
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5222137 |
Dynamic encryption key selection for encrypted radio transmissions
A radio (100) transmits and receives encrypted signals having unencrypted key identifiers, allowing other radios having the corresponding key identifiers and encryption keys to communicate with...
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5164985 |
Passive universal communicator system
A communication system includes a base station, called a "Controller" and one or more remote or satellite stations, each called a "Communicator". The controller arbitrates, controls and...
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4991207 |
One-way address transmission system of PCM music
In one way address transmission system of a PCM music broadcasting, a plurality of the PCM signals are time divisionally multiplexed and then the multiplexed data is scrambled for transmission. An...
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4856061 |
Method for cryptographic transmission of speech signals and a communication station for performing the method
In a communication system, in which a great number of communication stations operate on the same telecommunication channel, such as a radio frequency, secret information transfer for selective...
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4677434 |
Access control system for transmitting data from a central station to a plurality of receiving stations and method therefor
An apparatus and a method of providing an access control for transmitted stock market data from a central radio station to a plurality of one-way radio receivers. Into each receiver is inputted an...
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4378551 |
Radio signal receiving apparatus with a security circuitry
A radio signal receiving apparatus such as a pager with a security circuitry includes operator-controlled switches for providing a plurality of different command signals which are used to actuate...
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3924075 |
Two-way privacy system terminal with single key pulse generator means
7. In a privacy system, a terminal comprising a transmitter of enciphered message signals and a terminal-identifying signal, means for supplying coded key pulses to said transmitter for enciphering...
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3594500 |
MISSILE COMMUNICATIONS LINK
The system provides for the simultaneous control of a plurality of missiles nd comprises a missile receiver system for handling a large quantity of data. The receiver performs a parity check for...
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3098220 |
Personal call system
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