| 7035411 |
Encryption method and apparatus encrypting and adding signature information to qubits |
| Apr-25-2006 |
Arbitrary quantum information is input. The information of a quantum two-state system is acquired as a qubit by performing a computation in consideration of a physical system. The acquired qubit is encrypted.... |
| 7003118 |
High performance IPSEC hardware accelerator for packet classification |
| Feb-21-2006 |
An architecture for a high performance IPSEC accelerator. The architecture includes components for scanning fields of packets, programming an IPSEC services device according to the scanned fields, and... |
| 6986056 |
Method and arrangement for generating binary sequences of random numbers |
| Jan-10-2006 |
A method and arrangement for generating binary sequences of random numbers uses the principle of random selection of the path of photons on a beam splitter and generating a random number by using two detectors... |
| 6944407 |
Method and apparatus for detecting radiation |
| Sep-13-2005 |
In analyzing radiation from a communication link, single-photon counting can be used to advantage especially at low levels of radiation energy, e.g. in the detection of optical radiation. Preferred detection... |
| 6938013 |
Money-transfer techniques |
| Aug-30-2005 |
A technique for transferring money between a customer and a beneficiary comprises a money-transfer company, and a plurality of selling agents and paying agents. The money-transfer company maintains a server,... |
| 6915429 |
System and method for fiber channel remote activation and enhanced security |
| Jul-5-2005 |
A system and method for remotely waking up a Fibre Channel attached device. A Fibre Channel attached device is set in a quasi-open mode wherein the device summarily rejects most requests and allocates... |
| 6895092 |
Cryptographic key distribution method and apparatus thereof |
| May-17-2005 |
A cryptographic key distribution method, in which coherent light being suitable for optical fiber communication network is used and high security is secured, is provided. A sending end encodes random numbers... |
| 6848053 |
Optical network unit and optical line terminal |
| Jan-25-2005 |
An optical network unit and an optical line terminal which efficiently control the data receiving and dechurning processes in a passive optical network. In a churning parameter memory subsystem, a first... |
| 6801626 |
Cryptographic key distribution using light pulses of three macroscopic quantum states |
| Oct-5-2004 |
At a sender site of a secure communication network, a first coherent light pulse sequence is phase modulated with a random bit sequence by a phase modulator, and a second coherent light pulse sequence... |
| 6778669 |
Quantum encryption device |
| Aug-17-2004 |
A quantum encryption device comprises a transmitter and a receiver between which an encrypted piece of information is transmitted. The transmitter comprises at least means to send a first packet of photons... |
| 6778314 |
Phase modulator and phase modulating method |
| Aug-17-2004 |
In case of the high-speed operation, it is difficult to ignore the time required for the voltage to rise to the level of voltage to be applied and the time to fall to 0V when the voltage is applied to... |
| 6775274 |
Circuit and method for providing secure communication over data communication interconnects |
| Aug-10-2004 |
A secure communication circuit for use with a data communication interconnect adapter and method of operation thereof. The secure communication circuit includes a first data buffer coupled to a data input... |
| 6707915 |
Data transfer verification based on unique ID codes |
| Mar-16-2004 |
A method of transferring a data packet from a providing communication terminal to a requesting communication terminal, wherein the requesting communication terminal transfers a message to the providing... |
| 6704420 |
Device for sending or receiving a signal encrypted using deterministic chaos |
| Mar-9-2004 |
Device for sending an encrypted signal, including: a source (1) for generating said signal and means (2) for intensity modulating the signal, a feedback loop which includes delay line means and non-linear... |
| 6678379 |
Quantum key distribution method and apparatus |
| Jan-13-2004 |
A method for testing the reliability of a quantum key distribution apparatus is provided. The method includes the steps of: producing a set of quanta by the sender, the set of quanta comprising first,... |
| 6577732 |
Hierarchical encryption technique for dense wavelength division multiplexed systems using a wavelength bus architecture |
| Jun-10-2003 |
Transmission-based data security is provided in dense wavelength division multiplexing systems using a transmission scheme that incorporates hierarchical scrambling techniques with a unique multiplexing... |
| 6529601 |
Method and apparatus for polarization-insensitive quantum cryptography |
| Mar-4-2003 |
A communication system uses quantum cryptography for the secure distribution of a key. A single-photon signal is phase-modulated and transmitted over a pair of time-multiplexed transmission paths. With... |
| 6513709 |
Optical transaction card system |
| Feb-4-2003 |
The optical transaction card is used to securely carrying out financial transactions and storing personal information. The optical transaction card is comprised of a first layer, a second layer, and a... |
| 6438234 |
Quantum cryptography device and method |
| Aug-20-2002 |
A system and method for communicating a key between two stations using an interferometric system for quantum cryptography. The method includes sending at least two light pulses over a quantum channel and... |
| 6289104 |
Free-space quantum cryptography system |
| Sep-11-2001 |
A system and method for quantum key delivery in a single-photon, free-space cryptography scheme including a transmitter and a receiver. The transmitter includes two pairs of photon sources, each of which... |
| 6275588 |
Apparatus and method for performing and controlling encryption/decryption for data to be transmitted on local area network |
| Aug-14-2001 |
A technique for performing compression, encryption and transmission, and reception, decryption and decompression, respectively, of data communication packages on an area network. |
| 6272224 |
Method and apparatus for quantum distribution of an encryption key |
| Aug-7-2001 |
Process and device for quantum distribution of an encryption key. According to the invention, a light beam is modulated by a signal, the phase of which can be adjusted at random. On reception, the received... |
| 6028935 |
Cryptographic receiver |
| Feb-22-2000 |
A cryptographic receiver (10) includes photon detectors (52, 54, 56, 58) arranged to detect photons arriving from filters (22) and (24). A fiber coupler (14) randomly distributes each received photon (16)... |
| 6018582 |
Optical transmission system implementing encrypting by deterministic chaos |
| Jan-25-2000 |
The invention relates to an optical transmission system that implements encrypting of an information carrying signal by deterministic chaos. The system includes a transmitter (1), a receiver (4), and one... |
| 6002773 |
Method and apparatus for encryption |
| Dec-14-1999 |
A method and apparatus of encrypting optical images and storing these images in memory using random phase encoding is presented. The encryption technique uses random phase encoding in both the input plane... |
| 5999285 |
Positive-operator-valued-measure receiver for quantum cryptography |
| Dec-7-1999 |
Quantum key distribution (QKD) employs non-orthogonal quantum states to distribute a random bit sequence between two users for use as a provably secure key for encryption and authentication. The key generation... |
| 5966224 |
Secure communications with low-orbit spacecraft using quantum cryptography |
| Oct-12-1999 |
Apparatus and method for secure communication between an earth station and spacecraft. A laser outputs single pulses that are split into preceding bright pulses and delayed attenuated pulses, and polarized.... |
| 5953421 |
Quantum cryptography |
| Sep-14-1999 |
In a method of communication using quantum cryptography, single-photon signals from a highly attenuated source are modulated and subsequently detected. In the step of detecting the modulated signal, the... |
| 5920627 |
Encryption device and decryption device for information conveyed by asynchronous transfer mode cells |
| Jul-6-1999 |
An encryption device can be used to encrypt information units conveyed by cells that are broadcast from an optical broadcast node to network units by a passive optical network. Each cell conveys at least... |
| 5870474 |
Method and apparatus for providing conditional access in connection-oriented, interactive networks with a multiplicity of service providers |
| Feb-9-1999 |
A control system provides secure transmission of programs, including at least one of video, audio, and data, between a service provider and a customer's set top unit over a digital network. Program bearing... |
| 5864625 |
Methods and apparatus for secure optical communications links |
| Jan-26-1999 |
Methods and apparatus for providing a secure optical communications link are disclosed. Communications information is encrypted with a security key. An optical beam is then modulated with both the security... |
| 5854840 |
Data transmission protocol method and apparatus |
| Dec-29-1998 |
A data communications protocol for single path media having low data error rate requires the generation of a data packet with a start code field having a predetermined pattern, a byte count field for defining... |
| 5850441 |
System and method for key distribution using quantum cryptography |
| Dec-15-1998 |
A method of communication based on quantum cryptography is modified to include an initial step of outputting from, e.g., a transmitter, a single-photon signal, which may be unmodulated. A receiver then... |
| 5793871 |
Optical encryption interface |
| Aug-11-1998 |
An analog optical encryption system based on phase scrambling of two-dimensional optical images and holographic transformation for achieving large encryption keys and high encryption speed. An enciphering... |
| 5768378 |
Key distribution in a multiple access network using quantum cryptography |
| Jun-16-1998 |
In a method of quantum cryptography, a transmitter (T) communicates on a quantum channel with several receivers (R1-R3). The receivers are located on different branches of a common communications network... |
| 5764765 |
Method for key distribution using quantum cryptography |
| Jun-9-1998 |
In a communication system using quantum cryptography for the distribution of a key, two stations each independently modulate a single-photon signal. The single-photon signal is transmitted to the two stations... |
| 5757912 |
System and method for quantum cryptography |
| May-26-1998 |
In a method of communication using quantum cryptography an encryption alphabet is used for coding signals for transmission on a quantum channel. The encryption alphabet comprises pairs of operators applied... |
| 5737420 |
Method for secure data transmission between remote stations |
| Apr-7-1998 |
A method for permitting the secure handling or data between two remote stations firstly involves the generation of an encrypted decryption key which is based on a fingerprint information signal from a... |
| 5712912 |
Method and apparatus for securely handling a personal identification number or cryptographic key using biometric techniques |
| Jan-27-1998 |
A method and apparatus using biometric information (such as a fingerprint, an iris structure, etc.) as a cipher for encrypting and decrypting a personal identification number (PIN) which is used as an... |
| 5675648 |
System and method for key distribution using quantum cryptography |
| Oct-7-1997 |
A method of communication uses quantum cryptography to encode and decode a signal. A key is distributed on a quantum channel, and information subsequent communicated between the transmitter and receiver... |
| 5623357 |
Method and apparatus for the monitoring and demarcation of synchronous digital hierarchy networks |
| Apr-22-1997 |
A method and apparatus for establishing an intelligent demarcation between facility and terminal segments of asynchronous optical network. Network management information contained with the overhead structure... |
| 5592554 |
Method for data security in a digital telecommunication system |
| Jan-7-1997 |
For data security in a digital telecommunication system having a plurality of subscriber equipment, a public key is respectively calculated from a secret key prescribed in a first subscriber equipment.... |
| 5515438 |
Quantum key distribution using non-orthogonal macroscopic signals |
| May-7-1996 |
Quantum key distribution (QKD) uses non-orthogonal quantum states to distribute random information, suitable for use as a key for encryption and authentication, between two users who share secret information... |
| 5473696 |
Method and apparatus for combined encryption and scrambling of information on a shared medium network |
| Dec-5-1995 |
An improved method and apparatus for encrypting and scrambling information cells transmitted on a telephone system local loop from a central office to a plurality of user premises networks via a shared... |
| 5442702 |
Method and apparatus for privacy of traffic behavior on a shared medium network |
| Aug-15-1995 |
The present invention provides a telecommunication network utilizing a passive optical network connecting a plurality of network terminations to a local exchange. Information cells and commands are transmitted... |
| 5410600 |
Pre-scramble encoding method and apparatus for digital communication |
| Apr-25-1995 |
A prescramble encoding mechanism divides a data word into a plurality of sequences of data bits for transmission over a fiber optic communication link. Complementary versions of control bits and odd and... |
| 5323463 |
Method and apparatus for controlling the spectral content of a data stream |
| Jun-21-1994 |
An FDDI transmitting apparatus employs a scrambler to scramble input NRZ data which in turn is input to an NRZI-to-NRZ pre-encoder. This is in turn coupled in series with an NRZ-to-NRZI encoder to produce... |
| 5311592 |
Sagnac interferometer based secure communication system |
| May-10-1994 |
A secure fiber optic communication system capable of tens of gigabits/second data transfer rates that utilizes a pair of single mode fiber optic cables in combination with one or more light sources, phase... |
| 5307410 |
Interferometric quantum cryptographic key distribution system |
| Apr-26-1994 |
An apparatus and method for distributing cryptographic key information is described incorporating a quantum channel for conveying dim and reference light pulses, a timing channel, a source of coherent... |
| 5243649 |
Apparatus and method for quantum mechanical encryption for the transmission of secure communications |
| Sep-7-1993 |
An apparatus and method that permit the transmission of secure communications. The invention uses quantum mechanical effects to establish nonlocal correlations between a pair of photons. This is analogous... |
