Abstract:
A method for detecting and responding to a configuration setting capable of causing undesired energy consumption in a configurable electronic device comprises measuring a power state of at least one connection point of the configurable electronic device to establish a measured power state value; comparing the measured power state value with a stored power state value for the connection point; and responsive to a discrepancy between the measured power state value and the stored power state value for the connection point where the discrepancy is capable of causing undesired energy consumption, emitting a condition signal.
Abstract:
A machine implemented method of authenticating a communication channel between a first device and a second device by providing proof of proximity between both devices, the method comprising: generating, at the first device, an acoustic authentication signal to be received at the second device via a solid body acoustic coupling established between the first device and the second device thereby providing proof of proximity between both devices and so authenticating the communication channel between the first device and the second device.
Abstract:
A method of accessing a remote resource (4) from a data processing device (2) includes obtaining a first URL corresponding to the remote resource (4), obtaining secret data corresponding to the first URL, using the secret data to generate an obscured URL at the data processing device (2), and accessing the remote resource using the obscured URL. This allows the user of the device (2) to see a first URL which is intelligible and provides useful information about the device, without sharing that information with the network. The obscured URL identifies the actual location of the remote resource and can be an unintelligible stream of digits or letters.
Abstract:
A data processing device 2 has a processor 4 which executes software directly from non-volatile memory 6, 8. The processor 4 has a runtime component 20 which dynamically maps software element identifiers specified by the software to corresponding software elements in memory 6, 8. Mapping information 22 is used to determine which software elements identifiers correspond to which software elements. This provides a level of indirection which can be used to make software updates more efficient, by updating only parts of the software while leaving old parts of the software as they are. Updated software elements can be stored to memory and the mapping information updated to point to the new elements, while existing mappings may be retained.
Abstract:
A data processing system operates in a plurality of modes including a first privilege mode and a second privilege mode with the first privilege mode giving rights of access that are not available in the second privilege mode. Application code executes in the second privilege mode and generates function calls to hypervisor code which executes in the first privilege mode. These function calk are to perform a secure function requiring the rights of access which are only available in the first privilege mode. Scheduling code which executes in the second privilege mode controls scheduling of both the application code and the hypervisor code. Memory protection circuitry operating with physical addresses serves to control access permissions required to access different regions within the memory address space using configuration data which is written by the hypervisor code. The hypervisor code temporarily grants access to different regions within the physical memory address space to the system in the second privilege mode as needed to support the execution of code scheduled by the scheduling code.
Abstract:
A method of creating, at a permissions management resource, access permissions relating to a subject device for at least one data processing device, the method comprising: obtaining, at the permissions management resource, input data; generating, at the permissions management resource, at least one permission relating to accessing the subject device in response to the input data; transmitting, from the permissions management resource to the subject device and/or the at least one processing device, a communication comprising the at least one permission.
Abstract:
There is provided a data processing apparatus that includes an input policy filter that receives input data and an input provenance that relates to the input data. The filter forwards some or all of the input data and the input provenance according to at least one input policy. A processing environment receives the input data forwarded by the input policy filter and processes the input data to generate output data. A management environment produces an attestation of the processing environment and produces an output provenance based on the input provenance and the attestation. An output policy filter receives the output data and the output provenance and forwards the output data and the output provenance according to at least one output policy.
Abstract:
A method of accessing data sent between a remote resource and a data processing device, the method comprising: caching data uploaded from the remote resource or caching data sent to the remote resource at one or more intermediate network nodes between the data processing device and the remote resource; and accessing the cached data stored at the one or more intermediate network nodes.
Abstract:
Technology for operating a data-source device for assembling a data stream compliant with a data stream constraint. The technology comprises acquiring a plurality of data items by accessing data in a memory and/or transforming data. Prior to completion of the accessing data in a memory, an accessor is selected based on an estimate of access constraint. Prior to completion of the transforming data, a transformer is selected based on an estimate of transformation constraint, wherein the transportation constraint comprises any data acquisition constraint. The access and transformation constraints are dependent upon system state it the data-source system. The data items are positioned in the data stream, and, responsive to achieving compliance with the data stream constraint, the data strewn is communicated.
Abstract:
A method for controlling communications between a data processing device in a first network and a target service in a second network via a gateway apparatus, the method comprising: transmitting a request to communicate with the target service from the data processing device to the gateway apparatus; transmitting device credentials from the data processing device to the gateway apparatus, wherein the credentials comprise information relating to the target service; verifying at the gateway apparatus an authentication status of the data processing device based on the device credentials; establishing a communication path between the data processing device and the target service if the authentication status is verified.