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| Number | Title | Issue Date |
| 8180056 | Methods and systems for communicating over a quantum channel Alice generates a sequence of key bits forming an initial cryptographic key. Alice then uses the sequence of key bits and a sequence of cipher bits to control respective control parameters of a quantum encoding process applied to a sequence of quantum pulses, where ... | 05/15/2012 |
| 8180057 | Chaotic signal enabled low probability intercept communication A circuit for generating chaotic signals implemented using heterojunction bipolar transistors (HBTs) and utilized in low probability intercept communications. The HBT chaotic circuit generates truly random analog signals in the GHz range that are non-repeating and d... | 05/15/2012 |
| 8180055 | Cryptographic system incorporating a digitally generated chaotic numerical sequence A cryptographic system (CS) is provided. The CS (500) is comprised of a data stream receiving device (DSRD), a chaotic sequence generator (CSG) and an encryptor. The DSRD (602) is configured to receive an input data stream. The CSG (300) include... | 05/15/2012 |
| 8175273 | Quantum cryptography communication method, quantum cryptography communication apparatus, and quantum cryptography communication system In quantum cryptography communication, a sequence of signals in the form of quantum states randomly selected from a plurality of quantum states each having a different phase modulation angle is transmitted from a data transmitting apparatus. In a data receiving appa... | 05/08/2012 |
| 8175274 | Range measurement apparatus and method using chaotic UWB wireless communication An apparatus for measuring a range based on a chaotic ultra wideband (UWB) wireless communication technology is disclosed. The Apparatus includes a chaotic signal generating/modulating unit, a transceiving unit, a detecting unit, a transform unit, a comparison unit,... | 05/08/2012 |
| 8144872 | System and method for generating analog-digital mixed chaotic signal, encryption communication method thereof A system and method for generating analog-digital mixed chaotic signal and an encryption communication method thereof are provided. In the system and method, the complementarity between continuous chaotic systems (12, 22) and digital chaotic systems (11, 2... | 03/27/2012 |
| 8103002 | Pulse position based-chaotic modulation (PPB-CM) communication system and method A PPB-CM communication system and method. The PPB-CM communication system includes a transmitter which splits a symbol period, which is a transmission unit of a communication signal, into at least a pair of parts, inserts a data signal into one of the parts, and tra... | 01/24/2012 |
| 8041037 | Cryptographic system and methods using a one way multidimensional function A cryptographic method and systems using a keyed one-way function. A sending device uses the keyed one-way function to authenticate one or more receiving devices prerequisite to communication. A multidimensional hypercube is generated, from which is formed a multidi... | 10/18/2011 |
| 8005221 | Chaotic spread spectrum communications system receiver A method is provided for coherently demodulating a chaotic sequence spread spectrum signal at a receiver (104). The method includes receiving a chaotic sequence spread spectrum signal including a plurality of information symbols. The method also includes gene... | 08/23/2011 |
| 8005220 | RF communication system having a chaotic signal generator and method for generating chaotic signal A radio frequency (RF) communication system having a chaotic signal generator and a method of generating a chaotic signal. The RF communication system includes a chaotic signal generator which generates a chaotic signal having a plurality of frequency components at ... | 08/23/2011 |
| 7974413 | Spread spectrum communications system and method utilizing chaotic sequence A method is provided for generating a coherent chaotic sequence spread spectrum communications system. The method includes phase modulating a carrier with information symbols. The method also includes generating a string of discrete time chaotic samples. The method ... | 07/05/2011 |
| 7920704 | Systems and methods for obtaining information on a key in BB84 protocol of quantum key distribution Systems and methods for obtaining information on a key in the BB84 (Bennett-Brassard 1984) protocol of quantum key distribution are provided. A representative system comprises a quantum cryptographic entangling probe, comprising a single-photon source configured to ... | 04/05/2011 |
| 7899183 | Random number generating and sharing system, encrypted communication apparatus, and random number generating and sharing method for use therein A sender's encrypted communication apparatus and a recipient's encrypted communication apparatus autonomously generate keys for encryption with respective key generators, store the generated encryption keys in respective encryption key memories, and store part of th... | 03/01/2011 |
| 7889868 | Quantum key distribution system A method is provided for distributing quantum cryptographic keys. The method includes receiving a first quantum signal from an initial quantum key generating transmitter. Following correspondence with the initial quantum key generating transmitter, a first quantum k... | 02/15/2011 |
| 7881473 | Quantum key distribution system and method Method and system for transmitting optical clock signals and quantum key signals on a single optical channel. A multi-photon optical clock signal is received at an electro-optic switch at a first clock rate. The electro-optic switch may be configured for an interval... | 02/01/2011 |
| 7876901 | Alternative design for quantum cryptographic entangling probe An alternative design is given for an optimized quantum cryptographic entangling probe for attacking the BB84 protocol of quantum key distribution. The initial state of the probe has a simpler analytical dependence on the set error rate to be induced by the probe th... | 01/25/2011 |
| 7809140 | Authentication of data transmitted in a digital transmission system A method of authenticating data transmitted in a digital transmission system, in which the method comprises the steps, prior to transmission, of determining at least two encrypted values for at least some of the data, each encrypted value being determined using a ke... | 10/05/2010 |
| 7747019 | Methods and systems for communicating over a quantum channel Alice generates a sequence of key bits forming an initial cryptographic key. Alice then uses the sequence of key bits and a sequence of cipher bits to control respective control parameters of a quantum encoding process applied to a sequence of quantum pulses, where ... | 06/29/2010 |
| 7734048 | Cryptographic system using chaotic dynamics The invention is a cryptographic system using chaotic dynamics. A chaotic system is used to generate a public key and an adjustable back door from a private key. The public key is distributed and can be used in a public key encryption system. The invention can also ... | 06/08/2010 |
| 7720228 | Modulator autocalibration methods for quantum key distribution Methods for calibrating the modulators in a QKD system (100) are disclosed. The methods include setting the voltage (VB) of Bob's modulator (MB) to a positive value and then adjusting the voltage (VA) of Alice's modulator (MA) in both th... | 05/18/2010 |
| 7711116 | Methods and systems for transmitting digital messages Digital communication schemes using chaotic signals as carriers can be broadly classified into two categories. In the first category, the chaotic signals carrying the information have to be synchronously regenerated at the receiver, which may be applicable to low no... | 05/04/2010 |
| 7602916 | Access-protected data carrier The invention relates to a data carrier having a semiconductor chip (5) with at least one memory. The memory contains an operating program that is able to perform at least one operation (h). In order to prevent unauthorized access to the data (x) processed wi... | 10/13/2009 |
| 7593531 | Methods and systems for transceiving chaotic signals A digital communication system based on the use of chaotic carriers is disclosed. For each symbol to be sent, the transmitter sends a reference chaotic signal followed by a transformed version of the reference chaotic signal. For different symbols, different transfo... | 09/22/2009 |
| 7587049 | Active stabilization of a one-way QKD system A one-way stabilized QKD system (10) that utilizes a control signal (CS) and a quantum signal (QS) that travel the same path through the system from a first QKD station (Alice) to a second QKD station (Bob). The control signal is detected at Bob and used to s... | 09/08/2009 |
| 7570767 | Decoupling error correction from privacy amplification in quantum key distribution An apparatus (1) and method for decoupling error correction from privacy amplification in a quantum key distribution (QKD 100) system includes two or more computer systems (102, 108) linked by quantum and classical channels (120, 122) whe... | 08/04/2009 |
| 7512239 | Protection key for hardware and information management system A protection key for hardware includes a first storage area configured to store a key data used for permission to use software installed in a information processor, a second storage area configured to store a data table including a plurality of random numbers, a rec... | 03/31/2009 |
| 7496203 | Quantum-key distribution method between a plurality of users or groups There is provided a quantum-key distribution method between a plurality of users or groups. A center prepares a predetermined number of entangled states consisting of qubits equal to the number of the users, and generates quantum states consisting of the qubits belo... | 02/24/2009 |
| 7492900 | Quantum communication system A quantum communication system including (a) an emitter configured to emit a plurality of photon pulses in groups of photon pulses, each group of photon pulses emitted over a group time period, wherein the average number of photons per pulse is less than 1, and (b) ... | 02/17/2009 |
| 7492901 | Single-photon generator and single-photon generating method A single-photon generator includes an exciton generation part including therein a quantum dot, an excitation part for generating an exciton in the exciton generator part, a recombination control part for controlling recombination timing of the exciton in the exciton... | 02/17/2009 |
| 7486794 | Data-processing arrangement comprising confidential data A data-processing arrangement (3) comprises a data-handling circuit (4) and a supply-current circuit (8) whose dynamic behavior is inherently chaotic in the sense of Lyapunov. The data-processing arrangement is arranged so that a power supply cu... | 02/03/2009 |
| 7440570 | Method and apparatus for remote digital key generation A method and apparatus that uses tha dynamics of chaotic system for the remote generation of a digital key, for use in any encryption algorithm. After initialization, the dynamics of a chaotic system are allowed to generate the 0 and 1 bits of a key bistream. An ini... | 10/21/2008 |
| 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 |
| 7418099 | Method and apparatus for performing elliptic curve arithmetic A method of performing a cryptographic operation on a point in an elliptic curve cryptosystem using an elliptic carve. The method comprises the steps of obtaining information that uniquely identifies the elliptic curve and performing computations on the point to obt... | 08/26/2008 |
| 7386130 | Encryption secured against DPA The encryption device includes a random number generator for generating a random number; and a first selector for selecting one of q fixed values in response to the random number, a second selector for selecting one set of q sets of fixed S-box tables in response to... | 06/10/2008 |
| 7379546 | Method for XZ-elliptic curve cryptography Given a set of elliptic curve points defined over a field F(p) and represented in projective coordinate, a method is presented which allows the embedding of data bits in both the X-coordinate and the Z-coordinate of the elliptic curve point when represented in proje... | 05/27/2008 |
| 7368962 | Clock supply device Each clock supply unit comprises an inter-unit synchronization portion which operates when the clock supply unit is acting as a standby unit, using a clock signal from a DPLL of a unit which is active as reference, to apply a predetermined phase difference to the ou... | 05/06/2008 |
| 7366299 | Method for encrypting and decrypting data using derivative equations and factors A data cryptographer encrypts and decrypts character data of any given length using derivative equations and factors. The use of factors and derivative equations introduces the randomness required for effective encryption without the use of complex mathematics. A se... | 04/29/2008 |
| 7362834 | Method and device for synchronizing at least one node of a bus system and a corresponding bus system Method of synchronizing at least one user of a bus system which is operated with a preselectable system clock period (NTU), a local clock period (LNTU) and a reference clock period (GNTU) being preselected for the at least one user, and the reference clock period (G... | 04/22/2008 |
| 7359101 | Tests of quantum information Quantum testing can compare unknown photon states in a manner suitable for a validation check of a quantum digital signature, testing of the operation of a quantum gate, or detecting of entanglement. The effect of the QSC system can be used to entangle input photon ... | 04/15/2008 |
| 7359512 | Authentication in a quantum cryptographic system A quantum cryptographic device provides authentication services over the optical (quantum) channel and the public channel. In one implementation, polarizers generate optical pulses that have a polarization state based on a bit from a first bit sequence. A polarizati... | 04/15/2008 |
