Hewlett-packard Development Company, L.p.

Hewlett-packard Company

Stmicroelectronics S.r.l.

Other

Hewlett Packard Enterprise Development LP

Inter-university Research Institute Corporation Research Organization of Information and Systems

Keith Alexander Harrison

Liqun Chen

William John Munro

Timothy Paul Spiller

Marco Casassa Mont

Martin Sadler

Helen Balinsky

Guido Marco Bertoni

Pasqualina Fragneto

Christopher Tofts

Gerardo Pelosi

Richard Brown

John Deryk Waters

James Thomas Edward McDonnell

Brian Quentin Monahan

Raymond G Beausoleil

Weng Wah Loh

Kae Nemoto

Gary A Schwenck

Thomas Rathbone

Stephen James Crane

Mark Corio

Stefek Malkowski Zaba

David Soldera

Marco Fiorentino

Michael R Tan

Chris I Dalton

Adrian John Baldwin

Siani Lynne Pearson

Fraser John Dickin

Richard Anthony Lawrence

Cheh Goh

Richard Smith

Nicholas John Haddock

Joanna Duligall

Radu Ionicioiu

Simon Shiu

Derek Proudian

Jim Colton

Philip Stenton

Stephen Whittaker

John Malone-Lee

John Gilroy Rarity

Joanna Louise Duligall

In one implementation, computer executable instructions are provided to identify a group of instructions corresponding to a code block for an executable module. The instructions increment a counter associated with the code block to indicate the code block has been tested.

System and method to indicate code block execution

A method and apparatus () are provided for routing entanglement building between a selected pairing of interface qubits (). The qubits of the selected pairing of interface qubits () are separately entangled with at least one intermediate qubit () by interacting respective light fields with the interface qubits of the selected pairing and using an optical merge arrangement () to further interact the light fields with at least one intermediate qubit (). Where there are multiple intermediate qubits () the intermediate qubits are entangled with each other. The or each entangled intermediate qubit () is then removed from entanglement.

Method and apparatus for selectively routing entanglement building

In carrying out a task that consumes data from a one-time pad, task inputs comprising at least first data and second data from the pad, are combined together to form an output from which the data used from the pad cannot be recovered without knowledge of at least one of the first and second data. The task concerned can be, for example, the encrypting of a message or the creating of an attribute verifier.

Method and device using one-time pad data

A method is provided of creating an end-to-end entanglement () between qubits in first and second end nodes () of a chain of optically-coupled nodes whose intermediate nodes () are quantum repeaters. Local entanglements () are created on an on-going basis between qubits in neighboring pairs in the chain through interaction of the qubits with light fields transmitted between the nodes. The quantum repeaters () are cyclically operated with their top-level operating cycles being synchronized. Once every top-level operating cycle, each repeater () initiates a merging of two entanglements involving respective repeater qubits that are at least expected to be entangled with qubits in nodes disposed in opposite directions along the chain from the repeater. A quantum repeater () adapted for implementing this method is also provided.

Quantum repeater and system and method for creating extended entanglements

A device is arranged to carry out security-related tasks using one-time pad data. The device has a memory for holding multiple one-time pads, each pad having a different security rating and being intended for use by the device in executing a task to that security rating. Provisioning of the pads with one-time pad data involves carrying out a process for obtaining new secret random data. This process has a security rating with the value of this rating varying according to the nature and parameters of the process concerned. The security rating of the process used to obtain the new secret random data is matched to that of the pad to be provisioned with one-time data, or the other way around, such that the security rating of the process is as least as good as that of the pad to be provisioned.

Device with multiple one-time pads and method of managing such a device

An authentication method of a first module by a second module includes the steps of generating a first random datum by the second module to be sent to the first module, generating a first number by the first module starting from the first datum and by way of a private key, and generating a second number by the second module to be compared with the first number, so as to authenticate the first module. The step of generating the second number is performed starting from public parameters and is independent of the step of generating the first number.

Authentication method

An iterative method is provided for progressively building an end-to-end entanglement between qubits in first and second end nodes () of a chain of nodes whose intermediate nodes () are quantum repeaters. At each iteration, a current operative repeater () of the chain merges an entanglement existing between qubits in the first end node () and the operative repeater, with a local entanglement formed between qubits in the operative repeater and its neighbor node towards the second end node (). For the first iteration, the operative repeater is the neighbor of the first end node (); thereafter, for each new iteration the operative repeater shifts one node further along the chain toward the second end node (). A quantum repeater adapted for implementing this method is also provided.

A method includes executing a hypervisor () with computing hardware () to implement a virtual machine (); responsive to detecting a removable storage medium () communicatively coupled to the computing hardware (), executing a virtualized migration control appliance () through the hypervisor () separate from the virtual machine (); and blocking the virtual machine () from accessing data () stored by the removable storage medium () with the virtualized migration control appliance () if at least one governing policy prohibits the virtual machine () from accessing the data ().

Dynamic virtualization and policy-based access control of removable storage devices in a virtualized environment

A QKD transmission apparatus comprises a GPS receiver module operable to receive a GPS signal, and a processor operable to use the GPS signal to derive a clock signal for transmission of a QKD signal.

Quantum key distribution method and apparatus

Identifier-based signcryption methods and apparatus are disclosed both for signing and encrypting data, and for decrypting and verifying data. The signcryption methods use computable bilinear mappings and can be based, for example, on Weil or Tate pairings. A message sender associated with a first trusted authority carries out integrated signing/encryption processes to send a signed, encrypted message to an intended recipient associated with a second trusted authority. The recipient then carries out integrated decryption/verification processes to recover the original message and verify its origin.

Identifier-based signcryption with two trusted authorities

Data to be output to a removable storage medium is encrypted for sending to an output device by an encryption process based on encryption parameters comprising public data of a trusted party and an encryption key string comprising a policy for allowing the output of the data. The trusted party provides a decryption key to the output device but only after being satisfied that the policy has been met. The decryption key is generated in dependence on the encryption key string and private data of the trusted party. The output device uses the decryption key in decrypting the data to be output. Embodiments are provided that involve multiple policies and trusted parties.

Data output method, system and apparatus

A method of processing information to be confidentially transmitted from a first module to a second module provides that a first scalar multiplication may be carried out in order to obtain a first result [r]P. This first scalar multiplication comprises a plurality of generation steps of ordered factors from which a plurality of first partial sums are required to be built. The method also comprises the carrying out of a second scalar multiplication in order to obtain a second result. This second multiplication provides that a plurality of second partial sums may be built. A piece of encrypted information is obtained by processing the information based on the results of the scalar multiplications. The second partial sums of the second scalar multiplication use the same ordered factors obtained by the generation step of the first scalar multiplication.

Method of processing information to be confidentially transmitted

A processing arrangement of a data communication apparatus is arranged to derive an ordered plurality of modulo-2 summations of respective selections of data bits of a binary data set. The data communication apparatus may either be transmitting apparatus with the processing arrangement serving to determine a target syndrome for subsequent use in error correction, or receiving apparatus with the data processing arrangement being arranged to effect error correction of received data. The processing arrangement effects its selections of bits from the binary data set in accordance with the interconnection of nodes in a logical network of nodes and edges that together define at least a continuum of cells covering a finite toroid. The structuring provided to bit selection by this continuum can be offset by randomness provided by other structures of the network and by the random association of bits of the binary data set with the nodes of the continuum.

Data processing arrangements for use in data communication apparatus in connection with error correction

Secret random data is distributed to a plurality of devices to provision them with new one-time pad data for use in interacting with apparatus holding the same one-time pad data. This distribution is effected by provisioning a first device with a block of secret random data that is, or will become, available to the apparatus. Part of the secret random data is then distributed from the first device to one or more other devices in a hierarchical distribution pattern headed by the first device. Each device, other than those at the bottom of the distribution hierarchy, retains part of the secret random data it receives and passes on the remainder. Each device uses that part of the secret random data it has retained to provide the device with new one-time pad data. A method is also provided for tracking service usage based on the distributed one-time pad data.

Method of provisioning devices with one-time pad data, device for use in such method, and service usage tracking based on one-time pad data

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Woodcroft Chepstow, United Kingdom

Keith Alexander Harrison