Abstract: A method for operating a user communication device (18a, 18b, 19a, 19b), and a program and user communication device that operate in accordance with that method. An interface (2d, 2b, 23, 22) of the communication device (18a, 18b, 19a, 19b) is operated to enter identifiers identifying respective calling sources (18a, 18b, 19a, 19b) from which call signals may be received. The interface also is operated for entering into the device (18a, 18b, 19a, 19b) electrical signals representing corresponding audible signals that are to be individually generated in response to calls being received from the respective calling sources (18a, 18b, 19a, 19b). The identifiers are stored in a memory (2c, 24) in association with respective ones of the electrical signals.

Abstract: A system stores pedigrees that include details of how and when each of multiple blocks of encryption key material were distributed between two endpoints using quantum cryptographic techniques. The system receives an indication of a possible quantum cryptographic security violation and accesses the stored pedigrees to identify one or more of the multiple blocks of encryption key material that may have been compromised.

Abstract: A system includes an optical network unit and a head-end or central office connected to a multi-drop optical network. The optical network unit transmits dim optical pulses via the multi-drop optical network using quantum cryptographic mechanisms to distribute encryption key symbols, where the dim optical pulses include one of single-photon optical pulses or weak attenuated optical pulses. The head-end or central office detects the dim optical pulses from the optical network unit, derives the encryption key symbols from the detected dim optical pulses, and encrypts data transmitted to the optical network unit using the encryption key symbols.

Abstract: A system obtains first encryption key material using quantum cryptographic mechanisms and obtains second encryption key material using non-quantum cryptographic mechanisms. The system encrypts data using the first encryption key material to produce first encrypted data and encrypts the first encrypted data using the second encryption key material to produce second encrypted data.

Abstract: The systems and methods described herein include, among other things, processes for providing low latency packet transport in ad hoc networks. To this end, the systems, in certain embodiments, employ an architecture for communication nodes in MANETs, in which the delay introduced in “routing” or “relaying” the packet is reduced. In these systems invention, the data plane of the OSI stack at relay nodes is collapsed so that bits entering the node are re-energized “on-the-fly”, with only a brief pause. A transit key in each packet, inserted by the originator of the packet, is used to index into a transit table to determine one of three actions to perform—drop, keep, or retransmit the packet. A control plane determines, for each packet, whether it should be re-energized or not. The control algorithm ensures that only nodes along the path from the source to the destination re-energize (relay) the packet.

Abstract: A quantum cryptographic key distribution (QKD) transmitter includes an integrated photonic circuit configured to distribute encryption key material using quantum cryptographic mechanisms. The integrated photonic circuit further includes a first photon source, an interferometer coupled to the first photon source and a phase modulator coupled to the interferometer and configured to modulate a phase of photons emitted by the first photon source.

Abstract: The present invention shows, among other things, how to build rapidly deployable ad hoc networks from a combination of wired communications components with wireless communication components. The resulting kind of network is entirely novel and has a number of advantages over existing wireless-only techniques. Namely, it combines automatic robustness in the face of errors and network destruction with the high speed and great resistance to jamming of wired network.

Abstract: The disclosed systems and methods provide for the compression and decompression of packet headers. An uncompressed header can be compressed in size to form a smaller, compressed header, such that the compressed header can include values that can be used to re-produce the uncompressed header. A compressed header can include at least two such values. A first value of the at least two values can be computed based on a second, earlier uncompressed header and can be used to derive the uncompressed header. Similarly, a second value of the at least two values can be computed based on a third uncompressed header and can be used to derive the same uncompressed header. Accordingly, the uncompressed header can be derived based on the first value and the second uncompressed header, or based on the second value and the third uncompressed header. The uncompressed header, second uncompressed header, and third uncompressed header can be associated with different packets.

Abstract: Systems and methods are provided for connecting a software radio to an antenna. The system includes a group of radio components [302-1, 302-2, 302-3, 302-4, 304, 306, 308, and 310] and a packetized switch [303]. Some of the radio components are connected to at least some other of the radio components via the packetized switch, such that a collection of connected ones of the radio components forms a complete software radio. A management station [312] may be provided for monitoring, controlling and configuring the radio components [302-1, 302-2, 302-3, 302-4, 304, 306, 308, and 310].

Abstract: An optical transmitter includes a transmitting unit and a processing unit. The transmitting unit transmits multiple optical synchronization pulses at a first intensity, and transmits multiple optical quantum cryptographic key distribution (QKD) pulses at a second intensity. The processing unit encodes a cryptographic key symbol in a quantum state of each QKD pulse of the QKD pulses, and delays transmission of each of the multiple optical synchronization pulses a derived interval after transmission of a corresponding one of the multiple QKD pulses.

Abstract: A network includes a first node (110) and a second node (120). The first node (110) generates a timestamp message (220) that includes a first value, transmits the timestamp message (220) to the second node (120), and records a second time value representing a time at which a portion of the timestamp message (220) is being transmitted. The second node (120) receives the timestamp message (220), generates a new timestamp message (440) in response to receiving the timestamp message (220), stores the first value from the timestamp message (220) in the new timestamp message (440), stores second node processing time information in the new timestamp message (440), and transmits the new timestamp message (440) to the first node (110).

Abstract: A wireless device (110) includes a transceiver (230), an output queue (220), indicator logic (250, 510), and an indicator (260). The transceiver (230) is configured to transmit data to a network via a wireless connection. The output queue (220) is configured to store data that awaits transmission by the transceiver (230). The indicator logic (250, 510) is configured to estimate the quality of the wireless connection based on queuing behavior of the data and/or transceiver behavior relating to the data. The indicator (260) is configured to provide information regarding the quality of the wireless connection to a user of the wireless device (110).

Abstract: A system includes at least one input monitoring unit that monitors an environment and produces a video and an audio signal corresponding to the environment; a Central Monitoring Office that displays image and sound information corresponding to the video and audio signals; and a self-organized mobile wireless communications network. The at least one input monitoring unit is remote from the Central Monitoring Office and transmits the video and audio signals to the Central Monitoring Office over the wireless communication network.