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| Number | Title | Issue Date |
| 7587050 | Method, system, base station and data carrier for clash-free transmission between a base station and a number of mobile data carriers To enable a method and a system, having at least one base station and/or one data carrier, for transmitting signals between the base station and a number of mobile data carriers operating in the crypto mode or in the plain mode, wherein [a] the base station emits at... | 09/08/2009 |
| 7424116 | Method and apparatus for providing authentication in a communication system A method includes receiving an authentication request from a mobile station (401) and determining whether to forward the request to an authentication agent. When it is determined to forward the request, the request is forwarded to the authentication agent ( | 09/09/2008 |
| 7376235 | Methods and systems for frustrating statistical attacks by injecting pseudo data into a data system Disclosed are methods and systems for frustrating statistical attacks. A sender and receiver agree upon an encryption and integrity encoding scheme. For each “real” data packet, the sender generates integrity information, puts it in the packet, and then encrypts... | 05/20/2008 |
| 7360119 | Method and apparatus for handling SAS/SATA communication deadlock Broadly speaking, a method and apparatus is provided for identifying and responding to a deadlock condition in a SAS/SATA communication process. More specifically, an initiator device involved in the SAS/SATA communication process is defined to recognize a received ... | 04/15/2008 |
| 7356147 | Method, system and program product for attaching a title key to encrypted content for synchronized transmission to a recipient A method and system for attaching a title key to encrypted content for synchronized transmission to, or storage by, a recipient is provided. Specifically, under the present invention, an elementary media stream is parceled into content units that each include a cont... | 04/08/2008 |
| 7330838 | System and method for securing transactional data transmitted over a wireless network in a retail store environment A system and method secure transactional data communicated over a wireless network in a store by obfuscating bona fide transactional messages in the message traffic flow. The system includes a load balancer coupled to a store host computer and a plurality of transac... | 02/12/2008 |
| 7295334 | Image processing apparatus having configurable processors An image processing apparatus includes at least two signal processor modules interconnected each other in series. Each of the signal processor modules has an input port through which data is input, a memory which stores data, a signal processor portion which carries... | 11/13/2007 |
| 7225329 | Enhanced CSU/DSU (channel service unit/data service unit) In an embodiment, a communication node coupled to a first data network and a second data network is disclosed. The first data network is a wide area data network. The communication node includes a first data interface to the first data network, a second data interfa... | 05/29/2007 |
| 7155015 | Optical disk apparatus and data randomizing method using for optical disk apparatus In the optical disk apparatus, an arbitrary seed data for randomizing is added to an original data to be recorded on a disk. One-bit randomizing data is determined by operation using one-bit original data or seed data, and plural-bit past randomized data. At the tim... | 12/26/2006 |
| 7068788 | Data encryption for suppression of data-related in-band harmonics in digital to analog converters The present invention is related to digital to analog converter (DAC) input data encryption off-chip and decryption on-chip to suppress input data in-band harmonic leakage through package related parasitic capacitance. More specifically, the present invention relate... | 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 |
| 6950518 | Data encryption system A system (100) and method (400, 500) for data encryption and decryption are disclosed. The encryption system is operable at encryption rates in excess of 10 Mbps and is expandable to over 200 Mpbs. For encryption, plain characters are received, and a k... | 09/27/2005 |
| 6919794 | Circuit for controlling the random character of a random number generator A circuit for controlling the random character of a bit flow, including an input shift register receiving the bit flow and having its outputs exploited in parallel, at least one element for comparing at least a partial content of the input register with predetermine... | 07/19/2005 |
| 6918037 | Method and apparatus for command perception by data value sequencing, allowing a bounded total amount of spurious data A system and method for peripheral control. The present invention relates to utilizing device address call sequencing for control of active memory bus peripheral devices, allowing for a bounded amount of spurious data in the sequence. ... | 07/12/2005 |
| 6909783 | Alphabet soup cryptography Computer methods, systems, and devices, providing automatic permutations of a programmed modified random symbol square matrix producing one time pad messages are disclosed enabling messages to be encrypted from plain text which is typed into a computer thereby selec... | 06/21/2005 |
| 6779111 | Indirect public-key encryption A system and method for encrypting data communications between a client and server utilizes an untrusted proxy server to perform computationally expensive encryption calculations which would otherwise be performed by the client. Prior to transmitting the data messag... | 08/17/2004 |
| 5956401 | In-service monitoring in communications networks A communications path not using a deterministic signal frame structure is provided with performance monitoring by using known Alarm Indication Signal (AIS) type monitoring on the path but scrambling traffic signals in a scrambler to avoid them being mista... | 09/21/1999 |
| 5715312 | Concealment method and arrangement and reproducing apparatus provided with the concealment arrangement Arrangement for carrying out a concealment on an information signal, the information signal including subsequent signal blocks (padding sequence), each signal block including a sequence of alternate first frames and second frames of different lengths, exp... | 02/03/1998 |
| 5636279 | Scramble apparatus and descramble apparatus A scramble apparatus for scrambling data including a variable length code and a descramble apparatus is for descrambling a scrambled signal, and a scramble transmission apparatus comprising the scramble apparatus and the descramble apparatus. A specific c... | 06/03/1997 |
| 5617476 | Audio scrambling system for scrambling and descrambling audio signals A scrambling system has a scrambling apparatus and a descrambling apparatus for scrambling and descrambling a digital audio signal having a plurality of 16-bit long sample data units. The scrambling apparatus has a detector for detecting, in each sample d... | 04/01/1997 |
| 5515437 | Scramble transmission apparatus and signal processing apparatus The occurrence of malfunction on the reproduction side is avoided by preventing a scrambled signal from being coincided with a reserved word in the signal when a scramble process is carried out in order to release a transmission signal to specific users. ... | 05/07/1996 |
| 5333197 | System to prevent a scrambler from generating undesired symbols A communication system is described in which data characters are each repeatedly encoded in an encoder (3) until an encoded character occurs which is not one of a predetermined set of characters, e.g. reserved characters. Each encoded character, whether o... | 07/26/1994 |
| 5239581 | Secret communication apparatus This secret communication apparatus used in an audio and data transmission system has scramble/descramble circuits formed of programmable logic means. A control circuit in the apparatus instructs the programmable logic means to alter the arrangement of sc... | 08/24/1993 |
| 5086470 | Scrambling in digital communications network using a scrambled synchronization signal A passive, all optical communications network is provided in which a single optical source in a central station serves many outstations (e.g. telephones in customers' premises). Time division multiplexed optical signals from a laser source are transmitted... | 02/04/1992 |
| 4993070 | Ciphertext to plaintext communications system and method A ciphertext to plaintext communications system including a communications channel, a generator, a data device, an encryptor, a black to red communicator (BRC) device, a decryptor, and a comparator. The generator generates a first data-bit sequence which ... | 02/12/1991 |
| 4864617 | System and method for reducing deadlock conditions caused by repeated transmission of data sequences equivalent to those used for inter-device signalling A system and method for reducing the probability of deadlock conditions caused by the repeated transmission of data frames containing data sequences equivalent to those used by serial data communications equipment for inter-device signalling uses a techni... | 09/05/1989 |
| 4792949 | Service channel circuit for multiplexed telecommunications transmission systems In accordance with the present invention a plurality of input control data bits are added to a plurality of input telecommunications transmission channels in the form of an input control word wherein any of the individual data bits can be changed without ... | 12/20/1988 |
| 4675477 | Electronic device providing automatic permutations of a Vigenere Square This invention relates to cryptographic teletypewriter systems and more picularly to an electronic device for use in such systems which automatically provides permutations of a Vigenere Square.... | 06/23/1987 |
| 4627074 | Method and arrangement for transmitting characters In order to prevent bit combinations which are assigned to specific control characters from arising when ciphering characters, transmittable characters which consist of a part of the ciphered character and fill characters are generated from the ciphered c... | 12/02/1986 |
| 4408093 | Cryptographic encoder-decoder An electronic cryptographic encoder-decoder is disclosed which performs the equivalent operations of a known simple hand-held cryptographic encoder-decoder. The electronic cryptographic encoder-decoder includes a parallel addressable, programmable read on... | 10/04/1983 |
| 4369333 | Method and apparatus for enciphering and deciphering of information Plain text or information which is to be processed at the transmitter end of the system is formed by groups of plain text or information signals which are separated by separation signals. In the absence of plain information signals there are inserted fill... | 01/18/1983 |
| 4329545 | Circuit arrangement for the control of semi-duplex data transmission system In a circuit arrangement for the control of semi-duplex data transmission systems, which operate in accordance with crypto techniques, and in which the data of a data source are supplied to a data terminal by way of a transmission side crypto device, a tr... | 05/11/1982 |
| 4323729 | Circuit arrangement for the control of a crypto operation in the case of procedure-controlled semi-duplex data transmission systems A crypto control circuit arrangement is disclosed for controlling crypto operation in the case of procedure-controlled semi-duplex data transmission systems in which data are transmitted from a first station with a first data device and a first crypto dev... | 04/06/1982 |
| 4262359 | Five V insertion unit 2. For use with a cryptographic teletype transmission system having a relay for transferring teletype characters to an encyphering transmitter, a decyphering receiver and a teletype printer, a security system comprising a generator for producing an auxili... | 04/14/1981 |
| 4208545 | Secrecy system 1. In a system of secret telegraph communication, an incoming channel over which miscellaneous matter intelligence signals are periodically received, an outgoing channel susceptible of operating at a higher speed than said incoming channel, a cipher unit ... | 06/17/1980 |
| 4172213 | Byte stream selective encryption/decryption device An apparatus for insertion in a communications line for providing message secrecy within a significant portion of existing communications networks. At the transmitter end, the apparatus receives messages from the communications line, enciphers them and re... | 10/23/1979 |
