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| Number | Title | Issue Date |
| 7672453 | Data encryption by nonlinear transfer function A communication system includes an encryptor and a decryptor. For improved encryption security, the encryptor includes a multitap delay line to produce mutually delayed samples of the signal to be encrypted. Each sample is operated on by a key or function to produce... | 03/02/2010 |
| 7352861 | Digital electronic component which is protected against electrical-type analyses This invention relates to a digital electronic component which is protected against electrical- and/or electromagnetic-type analyse). The inventive component comprises: a synchronous element (10) which is controlled by a clock (H); means (11, 12) of ge... | 04/01/2008 |
| 7352796 | Multiple data rate complex Walsh codes for CDMA A method and system using the fast encoding and decoding of hybrid Walsh CDMA and generalized hybrid Walsh CDMA codes for simultaneous transmission of multiple data rate users with the different data rate groups of users separated in the sequency domain of these com... | 04/01/2008 |
| 7321660 | Method and apparatus for encrypting/decrypting data using timed-release keys A computer system comprises a first computer entity arranged to encrypt data using an encryption key comprising a time value, and a second computer entity arranged to generate, at intervals, a decryption key using a current time value. The encryption and decryption ... | 01/22/2008 |
| 7319712 | Orthogonal code generation apparatus, scrambling code generation apparatus and portable radio terminal using such apparatus An orthogonal code generation apparatus can generate a sequence of orthogonal codes without having to prestore orthogonal code sequences in a memory, by applying logic operation on a sequence number and a location number using AND circuits A0, A1 | 01/15/2008 |
| 7269782 | Orthogonal frequency division multiplexing/modulation communication system for improving ability of data transmission and method thereof An orthogonal frequency division multiplexing (OFDM) communication system and method for improving frequency utilization efficiency. In the system, a Reed-Solomon encoder codes input information data, and outputs a Reed-Solomon block having a second number of Reed-S... | 09/11/2007 |
| 7231044 | Method and apparatus for real-time digital certification of electronic files and transactions using entropy factors An invention for digital authentication is provided. A first timing signal is received from a remote source using a receiver. Next, a delay number is stored. The delay number is based on a first delay time period between when the first timing signal was transmitted ... | 06/12/2007 |
| 7219082 | Financial management system A financial transaction network includes a customer network serviced by a host processor. The financial transaction network provides customers with a plurality of diverse and interchangeable financial products and financial services that customers may utilize to dir... | 05/15/2007 |
| 7218738 | Encryption and content control in a digital broadcast system A selective encryption encoder has a packet identifier that identifies packets of a specified packet type forming a part of a program. A packet duplicator duplicates the identified packets to produce first and second sets of the identified packets. A PMT (program ma... | 05/15/2007 |
| 7177426 | Electronic file protection using location An invention for electronic file protection using location and other entropy factors is provided. Environment information regarding a computer is obtained, wherein the environment information includes data concerning an operating environment of the computer. Based o... | 02/13/2007 |
| 7173900 | Method and apparatus for chip generation of a chip sequence A method and an apparatus for generating a chip of a chip sequence based on a supplied chip position index and a supplied sequence index is provided by generating a basic sequence bit using a portion of the chip position index and the sequence index, and by generati... | 02/06/2007 |
| 7143028 | Method and system for masking speech A simple and efficient method for producing an obfuscated speech signal which may be used to mask a stream of speech, is disclosed. A speech signal representing the speech stream to be masked is obtained. The speech signal is then temporally partitioned into segment... | 11/28/2006 |
| 7139284 | Spread code allocation method and base station in CDMA cellular A spread code allocation method in a CDMA cellular having a first code set including a plurality of first codes and a second code set including one or a plurality of second codes, allocating the second code to the first code set and multiplying the plurality of firs... | 11/21/2006 |
| 7076064 | Maintaining end-to-end synchronization on telecommunications connection A method and arrangement for maintaining end-to-end synchronization on a telecommunications connection on which data are transmitted in frames substantially in real time and using synchronized end-to-end encryption which is synchronized by occasionally transmitting ... | 07/11/2006 |
| 7068701 | Data transmission and reception within a spread-spectrum communication system A long code scrambler has been provided to scramble the data bits prior to QAM mapping. Different data rates are accommodated by using different long code m-tuples sampled at the modulation symbol rate, where m equals 2, 4 or 6 for 4, 16 or 64 QAM, respectively. In ... | 06/27/2006 |
| 7046809 | Device and method for scrambling/descrambling voice and data for mobile communication system The device and method for scrambling/descrambling voice/data in a mobile communication system involves vocoding or bypassing a signal received from a radio channel interval, scrambling the vocoded or bypassed signal using a random number, sending the scrambled signa... | 05/16/2006 |
| 7028246 | Orthogonal frequency division multiplexing/modulation communication system for improving ability of data transmission and method thereof An Orthogonal Frequency Division Multiplexing (OFDM) communiation system and method for improving frequency utilization efficiency. In the system, a Reed-Solomon encoder codes input information data, and ouputs a Reed-Solomon block having a second number of Reed-Sol... | 04/11/2006 |
| 6970843 | Financial management system A financial transaction network includes a customer network serviced by a host processor. The financial transaction network provides customers with a plurality of diverse and interchangeable financial products and financial services that customers may utilize to dir... | 11/29/2005 |
| 6970561 | Encryption and decryption with endurance to cryptanalysis An encrypting apparatus includes an encrypting operation section, a determining section and a control section. The encrypting operation section carries out an encrypting operation to a plaintext using intermediate data at each of a plurality of encrypting stages of ... | 11/29/2005 |
| 6956948 | Apparatus and method for generating multiple scrambling codes in asynchronous mobile communication system An apparatus and method for generating multiple scrambling codes in an asynchronous mobile communication system. In a scrambling code generating apparatus for generating a current scrambling code and a compressed mode scrambling code for compressed mode transmission... | 10/18/2005 |
| 6917641 | Method and apparatus for detecting software tampering in a subscriber device A subscriber device (2) includes a long code generator (12) and a modifier (30) for generating a spread bit stream with a predetermined error pattern that is transmitted by a transmitter (16) at the subscriber device (2) to a base ... | 07/12/2005 |
| 6810087 | Ultra-wideband communications system An ultra-wideband (UWB) communications system combines the techniques of a transmitted reference (TR) and a multiple access scheme called delay hopping (DH). Combining these two techniques using UWB signaling results in a penalty in signal-to-noise ratio (SNR) over ... | 10/26/2004 |
| 6389138 | Method and apparatus for generating a complex scrambling code sequence A complex spreading and/or scrambling code sequence generation system uses a first complex code sequence having at least two components and a second complex code sequence having at least two components. The components of the first complex code sequence ar... | 05/14/2002 |
| 5818934 | Method and apparatus for providing a cryptographically secure interface between the decryption engine and the system decoder of a digital television receiver A method for providing a secure interface between a decryption engine and a system decoder of a digital receiver, e.g., an MPEG-2 digital television receiver. The system decoder receives an encrypted bitstream and produces a cipher text bitstream which is... | 10/06/1998 |
| 5805635 | Secure communication system A secure communication system comprising: a first cyclical pseudo-random noise generator comprising determinable vable starting point means and an output; transmitting means for transmitting said pseudo-random noise generator output; receiving means for recei... | 09/08/1998 |
| 5249199 | Method and apparatus for reducing spurious noise levels in an audio system An audio system (600) typically includes an audio signal processor (610), a controller (607) for controlling data signals, and a peripheral data source (613). The audio signal processor (610) exchanges information with a remote audio device (603) via a co... | 09/28/1993 |
| 5235616 | Bidirectional data transmission system A bidirectional data transmission system using the technique known as spectrum spreading by direct sequence comprises a first transmitter-receiver assembly consisting of a first transmitter section which generates a coded first data signal for transmissio... | 08/10/1993 |
| 5058157 | Method and apparatus for encrypting and decrypting time domain signals A technique for encrypting and decrypting information signals normally arranged as a succession of lines of active information, with each line having a line timing reference, such as color video information signals. The active video portion is time shifte... | 10/15/1991 |
| 5029340 | CATV terminal unit having an improved descrambling operation A CATV terminal unit descrambling operation is disclosed wherein unrecovered video pulse portions, existing because a scrambling compression period is longer than a descrambling expansion period, are eliminated. The unrecovered pulse portions are eliminat... | 07/02/1991 |
| 4953211 | Encryption apparatus Encryption apparatus mainly intended for encrypting speech signals samples a signal to be encrypted at two differing rates, and reads the sampled signal into storage means at one of said rates and reads it out of said storage at the other of said rates so... | 08/28/1990 |
| 4937867 | Variable time inversion algorithm controlled system for multi-level speech security A method for scrambling speech such as in a mobile land based communication system is disclosed. Essentially, variable length time samples of digitized speech are stored and time inversion scrambled. The scrambled speech is converted back to analog form a... | 06/26/1990 |
| 4916736 | Method and apparatus for encrypting and decrypting time domain signals Time sequential information signals, such as color video signals having a line timing reference and an active video portion, are encrypted by time shifting the active video signal portion towards and away from the line timing reference signal in psuedo-ra... | 04/10/1990 |
| 4742546 | Privacy communication method and privacy communication apparatus employing the same A privacy communication system in which signals transmitted from a transmitter are subjected to time base compression and expansion while the received signal is subjected to time base expansion and compression in synchronism with the expansion and compres... | 05/03/1988 |
| 4730340 | Programmable time invariant coherent spread symbol correlator An hybrid array correlator is configured of a cascaded array of individually identical correlator cells, through which a preselectable reference symbol sequence, identifiable with a symbol to be acquired, is successively clocked, from cell to cell and the... | 03/08/1988 |
| 4688251 | Wave packet communication subsystem for determining the sync pulses and correlating the data pulses of a wave packet A subsystem of a wave packet communication system uses the same sets of receivers and correlators to detect both the sync pulses and the messages carried by different wave packets. The system does this by taking the sync pulses from each packet and genera... | 08/18/1987 |
| 4649549 | Apparatus for synchronizing linear PN sequences A system and method are disclosed for synchronizning the linear PN sequences contained in a received spread spectrum signal, characterized by the provision of a resident PN generator that is responsive to the chip rate clock for producing a replica of the... | 03/10/1987 |
| 4575754 | Video scrambler system A video signal is scrambled by partitioning the signal into blocks of segments, reversing the sequence of segments in each block, randomly delaying the reversed segments and reversing the sequence of the randomly delayed segments. The double reversal of t... | 03/11/1986 |
| 4392021 | Secure facsimile transmission system using time-delay modulation Method and apparatus for secure transmission of analog signals, particularly facsimile signals. The analog signal is first converted to a frequency-modulated signal, if not already one, and is then converted to a sequence of digital words representing the... | 07/05/1983 |
| 4363130 | Binary digital communication system 1. A binary digital communication system comprising a transmitter and receiver: said transmitter comprising means for alternately radiating in response to the digits of a binary message two signals of non-periodic energy which have been delayed by a prede... | 12/07/1982 |
| 4324002 | Delay-modulated random energy intelligence communication system 1. An intelligence communication system comprising a transmitter and a receiver; said transmitter comprising non-periodic energy means for generating a carrier, means for effecting a change in the time or frequency domain of the carrier signal whereby a r... | 04/06/1982 |
