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| Number | Title | Issue Date |
| 8189785 | Generating identical numerical sequences utilizing a physical property and secure communication using such sequences Substantially identical numerical sequences known only to stations A and B are generated in a manner not subject to duplication by an eavesdropper and not subject to cryptanalytic attack because they are not derived using a mathematical function (such, as for exampl... | 05/29/2012 |
| 8180052 | Data communication apparatus A data communication apparatus wherein stealthiness is enhanced by significantly increasing the time required for a wiretapper to decrypt an encrypted text. The data communication apparatus is constituted by connecting a data transmitting apparatus and a data receiv... | 05/15/2012 |
| 8170211 | Hub device for a network comprising quantum cryptographic connections and node module for said hub device The invention relates to a node device (21) for a network (20) comprising quantum cryptographic connections (1) provided with quantum channels (4) and public channels (5), comprising quantum optics means (11) for connecting ... | 05/01/2012 |
| 8165298 | Quantum cryptography communication apparatus and communication terminal In a quantum cryptography communication apparatus, a light pulse is generated by a light source and split into a signal light pulse and a reference light pulse on a receiving side. The signal light pulse and the reference light pulse are transmitted to a sending sid... | 04/24/2012 |
| 8165297 | Transceiver with controller for authentication A transceiver comprises a transmitter configured to transmit data signals, a receiver configured to receive data signals, and a controller configured to encrypt a string and supply the encrypted string to authenticate the transceiver. ... | 04/24/2012 |
| 8155318 | Quantum cryptography communication system In a system carrying out cryptography communication using a quantum, it is aimed to correctly verify a quantum state received at the commit phase according to the quantum bit string commitment system, even if not maintaining the quantum state until the open phase bu... | 04/10/2012 |
| 8126146 | Method of quantum cryptography using blind photon polarization quibits with multiple stages A cryptography method using a quantum phenomenon, which performs a multi-staged polarization process between a transmitter and a receiver to prevent a third party from knowing the polarization value of a photon. A transmitter rotates a photon flux by arbitrary angle... | 02/28/2012 |
| 8027473 | System and method for improved data protection in PONs Mechanisms for providing a subscriber-side interface with a passive optical network are described herein. An optical network termination (ONT) having an integrated broadband passive optical network processor is utilized to receive downstream data from an optical lin... | 09/27/2011 |
| 7965843 | Methods and apparatus for security over fibre channel Methods and apparatus are provided for improving both node-based and message-based security in a fibre channel network. Entity to entity authentication and key exchange services can be included in existing initialization messages used for introducing fibre channel n... | 06/21/2011 |
| 7929700 | Continuous variable quantum encryption key distribution system A continuous variable quantum encryption key distribution system comprises a sender (Alice) able to randomly choose the phase and the amplitude of each coherent light pulse of a signal, to provide a coherent state defined by a first quadrature and a second quadratur... | 04/19/2011 |
| 7907731 | Data communication system A data communication system that enhances concealment by significantly increasing the time required for a wiretapper to decrypt a cipher text. The data communication system is constituted by connecting a data transmitting apparatus (13105) to a data receiving... | 03/15/2011 |
| 7869600 | Optical transmitter and transmitting method for transmitting cryptogram A dynamic range of intensity modulation is set to range from a maximum intensity Smax to a minimum intensity Smin. A difference Δ(=Smax−Smin) between the maximum intensity Smax and the minimum intensity Smin is divided by the number 2M of multilevel signals. Thus... | 01/11/2011 |
| 7869599 | Quantum cryptography key distributing system and synchronizing method used in the same A quantum cryptography key distributing system includes an optical fiber; a transmission unit and a reception unit. The transmission unit is connected with the optical fiber, generates a transmission optical pulse signal from an optical pulse signal based on a first... | 01/11/2011 |
| 7864958 | Quantum key distribution method and apparatus A quantum key distribution (QKD) method involves the sending of random data from a QKD transmitter to a QKD receiver over a quantum signal channel, and the QKD transmitter and receiver respectively processing the data transmitted and received over the quantum signal... | 01/04/2011 |
| 7831048 | Secure quantum key distribution using entangled photons A system and method of implementing quantum key distribution are provided that possess increased data rates and enhanced security. These increased data rates are provided through the use of biphotons. Through encoding bits of information on the intra-biphoton delay ... | 11/09/2010 |
| 7831049 | Enhanced encryption method and system for ultra secure applications Techniques to bolster the security of an AlphaEta cryptosystem using spectral phase encoding. In one aspect, a spatial light modulator (SLM) is used to change the spectral code (spectral phase) of each optical bit in response to the output of an extended key generat... | 11/09/2010 |
| 7787625 | QKD cascaded network with loop-back capability A quantum key distribution (QKD) cascaded network with loop-back capability is disclosed. The QKD system network includes a plurality of cascaded QKD relays each having two QKD stations Alice and Bob. Each QKD relay also includes an optical switch optically coupled ... | 08/31/2010 |
| 7720226 | Private and secure optical communication system using an optical tapped delay line A method and apparatus for secure transmission of an information-containing optical signal. An optical signal is divided into a first plurality of sub-bands. Each of the sub-bands is modified to encrypt the information contained in the optical signal. The modified s... | 05/18/2010 |
| 7706536 | Phase locking in a multi-channel quantum communication system A communication system adapted to use wavelength (frequency) division multiplexing for quantum-key distribution (QKD) and having a transmitter coupled to a receiver via a transmission link. In one embodiment, the receiver is adapted to (i) phase-shift a local oscill... | 04/27/2010 |
| 7702106 | Quantum secret splitting based on non-orthogonal multi-particle states Systems and methods for quantum secret splitting based on non-orthogonal multi-particle states are disclosed. The method includes preparing at a sender (“Charlie”) two qubits each of which can be in one of two non-orthogonal states and distributing the qubits to... | 04/20/2010 |
| 7653199 | Quantum key distribution Apparatus and methods for establishing a secret key to encrypt and share data using quantum signals represented by an equiangular spherical code and using classical signals in authenticating the key. ... | 01/26/2010 |
| 7646870 | Triple churning A data encryption-decryption method includes the steps of receiving a data byte N and performing a triple-churning operation on byte N to obtain an encrypted byte N. Preferably, the triple-churning operation includes performing a first churning operation to obtain a... | 01/12/2010 |
| 7639809 | Quantum cryptography transmission method and system Encoding digital data intended for transmission by a particle flow of single particles, includes: encoding digital data on a parameter x of said particle flow, wherein the parameter x has a conjugated parameter y of said particle flow; and ensuring that said paramet... | 12/29/2009 |
| 7620182 | QKD with classical bit encryption A method for enhancing the security of a quantum key distribution (QKD) system having QKD stations Alice and Bob. The method includes encrypting key bits generated by a true random number generator (TRNG) and sent to a polarization or phase modulator to encode weak ... | 11/17/2009 |
| 7606367 | Quantum cryptography with fewer random numbers An apparatus and method for implementing a quantum cryptography system that requires fewer random bits. The emitter divides the key in blocks of bits. Instead of changing the basis for each bit of key sent by the emitter, the same basis is used for all the bits with... | 10/20/2009 |
| 7580524 | Method and apparatus for synchronizing the emitter and the receiver in an autocompensating quantum cryptography system In a method and apparatus for synchronizing the receiver and the emitter in an autocompensating quantum cryptography system it is allowed to one of the stations (for example the emitter) to define the timing of all its operations (for example the application of a si... | 08/25/2009 |
| 7577254 | Detector autocalibration in QKD systems A method (300) of performing photon detector autocalibration in quantum key distribution (QKD) system (200) is disclosed. The method (300) includes a first act (302) of performing a detector gate scan to establish the optimum arrival time... | 08/18/2009 |
| 7555127 | Quantum cryptography key distribution system and method In a quantum cryptography key distribution system for sharing a secret key between a transmitter and a receiver site, an unbalanced interferometer system in the transmitter site has a Mach-Zehnder interferometer switch with a phase modulator while the receiver site ... | 06/30/2009 |
| 7539308 | Quantum steganography A system and method of detecting entangled photon pairs, each pair including a signal photon and an idler photon, is disclosed. Entangled photon pairs are provided having an entanglement time and an entanglement area selected to substantially increase an associated ... | 05/26/2009 |
| 7529373 | Laser autocalibration for QKD systems A method of autocalibrating a quantum key distribution (QKD) system (200) is disclosed. The QKD system includes a laser ((202) that generates photon signals in response to a laser gating signal (S0) from a controller (248). The method inc... | 05/05/2009 |
| 7515716 | Systems and methods for reserving cryptographic key material Systems and a methods are provided for reserving a rate at which cryptographic material is provided. A reservation request [700] for reserving the rate is sent from a secret bits consuming application [410] to a secret bit producing application [405... | 04/07/2009 |
| 7512237 | Encryption for optical communications using dynamic subcarrier multiplexing A multiplexing technique for optical communications used to create a pseudo-random communications signal in the optical domain such that only the sender and/or receiver can decode the signal. The multiplexing technique may include one or more information-bearing opt... | 03/31/2009 |
| 7483535 | Transmission of generalized scalable bit-streams A method of encrypting a transmission unit of a generalized scalable bit-stream includes, for each atom of the transmission unit, concatenating bit-stream segments that map to the atom to obtain data for each atom. The data for a logically first atom of the pluralit... | 01/27/2009 |
| 7471793 | Method and apparatus for use in encrypted communication A method and apparatus for secure distribution of cryptographic key information based on quantum cryptography is described. The apparatus incorporates or is used with a transmitter comprising a source of pairs of dim, depolarized light pulses together with a phase m... | 12/30/2008 |
| 7460669 | Encoding, decoding and communication method and apparatus An encoding method, decoding method and a communication method using single photons where information is directly encoded into each photon. In one embodiment at least two out of the three parameters of phases, polarization, and energy are used to encode information.... | 12/02/2008 |
| 7460670 | Systems and methods for managing quantum cryptographic networks A system (125) performs network management in a quantum cryptographic network (115). The system (125) monitors parameters associated with multiple links and multiple nodes of the quantum cryptographic network (115). The system (125... | 12/02/2008 |
| 7457416 | Key distribution center for quantum cryptographic key distribution networks Methods and systems are provided for distributing key information by securely transmitting light information in a network along a path comprised of a plurality of network devices and by using a key distribution center (KDC) connected with the network. Three or more ... | 11/25/2008 |
| 7450719 | Gigabit Ethernet-based passive optical network and data encryption method A Gigabit Ethernet-based passive optical network that can reliably transmit data is disclosed. The network includes an OLT for receiving a public key through a transmission medium, encrypting a secret key by means of the received public key, transmitting the encrypt... | 11/11/2008 |
| 7436961 | Sentinel synchronization method for enhancing QKD security A method of improving the security of a QKD system is disclosed. The method includes sending synchronization (“sync”) signals from a first QKD station to the second QKD station over a sync signal channel and recording data relating to the arrival times of the sy... | 10/14/2008 |
| 7437081 | System and method for providing two-way communication of quantum signals, timing signals, and public data A system and method for providing two-way communication of quantum signals, timing signals, and public data is provided. Generally, the system contains a first public data transceiver capable of transmitting and receiving public data in accordance with a predefined ... | 10/14/2008 |
