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7395461 |
Low complexity pseudo-random interleaver
An interleaver has an input multiplexer that receives a data sequence at an interleaver input and that separates the data sequence into multiple data sub-blocks. The interleaver has a linear...
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7245721 |
Data encoding/decoding device and apparatus using the same
A data encoding device has a serial data input and an encoded serial data output. The serial input is supplied to an encoding unit which combines each input bit with a plurality of additional...
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7227956 |
Simple encrypted transmission system suitable for intermittent signals
A signal transmitted from a first device to a second device is encrypted using an encryption key generated from a preceding part of the signal itself. The signal is decrypted in the second device...
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7203844 |
Method and system for a recursive security protocol for digital copyright control
Systems and methods are described which utilize a recursive security protocol for the protection of digital data. These may include encrypting a bit stream with a first encryption algorithm and...
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7092406 |
Computer implemented communication apparatus and method
A communication apparatus and method includes a modem operable for connection to a telephone line, a voice receiving interface apparatus for use in receiving voice signals from a local user, and a...
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7082199 |
Simple encrypted transmission system suitable for intermittent signals
A signal transmitted from a first device to a second device is encrypted using an encryption key generated from a preceding part of the signal itself. The signal is decrypted in the second device...
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7082141 |
Computer implemented voice over data communication apparatus and method
A communication apparatus and method includes a modem operable for connection to a telephone line. Further, under control of a graphical user interface program executable on a personal computer,...
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7082106 |
Computer-based multi-media communications system and method
Outgoing multi-media data components are provided in a communication system and method implemented under control of a user interface program. Each of the outgoing multi-media data components...
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7035914 |
System and method for transmission of data
A system and method for data communication connecting on-line networks with on-line and off-line computers. The present system provides for broadcast of up to the minute notification centric...
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6944253 |
Circuit and software for generating a stream cipher
A circuit or software generates a cipher stream. The software models components or the circuit comprises a first and a second plurality of linear feedback shift registers (LFSR). A first of the...
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6909785 |
Method and apparatus for efficient irregular synchronization of a stream cipher
A method and apparatus for efficiently synchronizing a stream cipher. State information is transmitted that will allow the intended recipient of the encrypted data stream to set a stream cipher...
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6778670 |
Method and apparatus for encryption and decryption
A method and apparatus are provided for encrypting a stream of data transmitted within a frame. The method includes determining a first initialization state in a first preselected interval, and...
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6735614 |
Contact alerts for unconnected users
Users access an on-line address service to register their name (which may be a pseudonym or other fictitious or imaginary identity) and a unique contact address that may be used directly or...
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6735239 |
Sequence generator
A sequence generator for generating sequences of binary or discrete values may be flexibly adjusted to requirements. Shift register memory locations may be selected as feed-back locations for...
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6714614 |
Subscriber unit for generating a stream cipher
One embodiment of the invention is a subscriber unit for transmitting communication signals. The subscriber unit comprises a cipher stream generator which generates a cipher stream to encipher a...
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6590981 |
System and method for secure cryptographic communications
An apparatus and method for secure cryptographic communications between a sender and a receiver or multiple receivers that includes first and second timing elements, and first and second key...
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6430246 |
Method and apparatus for generating a stream cipher
A code division multiple access (CDMA) is a type of spread-spectrum communication system having a plurality of subscriber units and at least one base station. In order for a first subscriber unit...
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6426959 |
System and method for facilitating component management in a multiple vendor satellite communications network
A system is provided for controlling a network of communication terminals with a a management component and an implementation component, the implementation component in communication with the...
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6381250 |
Capacity allocation system using semi-autonomous network elements to implement and control a transmission schedule
A system for controlling a network of communication terminals with a management component and an implementation component, the implementation component in communication with the management...
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EP0682790B1 |
METHOD AND SYSTEM FOR SYNCHRONIZING ENCODERS AND DECODERS IN COMMUNICATION NETWORKS WHEN ERRORS ARE DETECTED
Abstract not available for EP0682790 Abstract of corresponding document: WO9514971 The method and system (400) synchronize an encoder of an encoder error synchronizer (402) and a decoder of a...
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6266418 |
Encryption and authentication methods and apparatus for securing telephone communications
An encryption device for a telephone having a handset and a base unit is disclosed. The device includes a handset interface, a first converter, an encryption processor, a second converter, and a...
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6215876 |
Apparatus for and method of detecting initialization vector errors and maintaining cryptographic synchronization without substantial increase in overhead
An apparatus and method for detecting erroneous initialization vectors transmitted over a communications channel and maintaining cryptographic synchronization by comparing a received vector with a...
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6167426 |
Contact alerts for unconnected users
Users access an on-line address service to register their name (which may be a pseudonym or other fictitious or imaginary identity) and a unique contact address that may be used directly or...
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6148053 |
Method and apparatus for generating a stream cipher
A code division multiple access (CDMA) is a type of spread-spectrum communication system having a plurality of subscriber units and at least one base station. In order for a first subscriber unit...
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6141533 |
Method and apparatus for a mobile repeater
A mobile repeater (300) is improved to include a database (303) that allows the mobile repeater to store registrations received from subscriber units. Additionally, the mobile repeater may include...
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6021433 |
System and method for transmission of data
A system and method for data communication connecting on-line networks with on-line and off-line computers. The present system provides for broadcast of up to the minute notification centric data...
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6009135 |
Method and apparatus for generating a stream cipher
A code division multiple access (CDMA) is a type of spread-spectrum communication system having a plurality of subscriber units and at least one base station. In order for a first subscriber unit...
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5768374 |
Apparatus and method for continuous scrambling while transmitting or receiving synchronization data
An apparatus and device for continuously scrambling audio while transmitting or receiving synchronization data. When transmitting, synchronization data will be substituted for scrambled audio but...
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5600726 |
Method for creating specific purpose rule-based n-bit virtual machines
A system and method for implementing one or more specific purpose rule-based n-bit virtual processing machines. Specific purposes include, but are not limited to, encryption, compression, and...
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5490167 |
Duplex voice communication radio transmitter-receiver
A duplex voice communication radio transmitter-receiver according to the present invention is provided with a low-pass filter arranged before a time compressing device in a transmitter section for...
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5479512 |
Method and apparatus for performing concryption
A method and apparatus for the integrated compression and encryption (concryption) of clear data and for the deconcryption of concrypted data to obtain the clear data for utilization. For...
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5473694 |
Synchronization of nonautonomous chaotic systems
A cascaded synchronized system includes a nonlinear transmitter, a nonlinear cascaded receiver, a phase-detector/controller coupled to the receiver, and a signal generator also coupled to the...
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5410599 |
Voice and data encryption device
A portable voice and data encryption device designed to be used with normal wideband telephone and cellular telephones, computers and facsimile machines to transmit voice and data in encrypted...
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5361302 |
Method for encryption sync compression in an encrypted radio telephone interconnect system
A method for transparently coupling an encrypted two-way RF communication unit (100) with an encrypted landline communication unit (104). An RF message comprised of a plurality of data frames...
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5321754 |
Sequence synchronization
A data sequence is transmitted from a transmitter to a receiver, being scrambled at the transmitter by adding a pseudo random sequence (PRS) thereto. At the receiver the received data is...
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5245660 |
System for producing synchronized signals
A system for producing two synchronized signals comprises a nonlinear dynamical primary system and a nonlinear dynamical secondary response subsystem. The primary system comprises a nonlinear...
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5243653 |
Method and apparatus for maintaining continuous synchronous encryption and decryption in a wireless communication system throughout a hand-off
In a wireless communication system comprising a plurality of fixed communication units (FCUs) (102) and portable communication units (PCUs) (120), each comprising an encryption synchronization...
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5130993 |
Transmitting encoded data on unreliable networks
Information encoded by data compression (or another data encoding technique, e.g., encryption, requiring synchronization between the encoder and decoder) is transmitted over an unreliable network...
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5060265 |
Method of protecting a linear feedback shift register (LFSR) output signal
The present invention discloses a method of protecting a pseudorandom (PN) signal generated by a linear Feedback Shift Register (LFSR) from cryptographic attack. This is accomplished by first...
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5003596 |
Method of cryptographically transforming electronic digital data from one form to another
A cryptographic system creates a key table from a single key such that the relationship between the keys in the key table cannot be determined even if the system implementation is known. The system...
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4972474 |
Integer encryptor
A integer encryptor and decryptor, with the integer encryptor comprising a pseudorandom source, a discrete-time source, guard-band means, and adding means. The pseudorandom source generates a...
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