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University of Bristol
(55 results)-
White Papers
Improving Accuracy and Cost of Two-Class and Multi-Class Probabilistic Classifiers Using ROC Curves
January 1, 2010, 12:00am PST
The probability estimates of a naive Bayes classifier are inaccurate if some of its underlying independence assumptions are violated. The decision criterion for using these estimates for...
Provided by University of Bristol
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White Papers
Using Excel to Individualise Basic Mathematics Assignments
June 29, 2009, 12:00am PDT
This paper sets out a method for creating and marking individualised mathematics assessments for students based on their ID numbers. It therefore provides a means for setting assessed coursework...
Provided by University of Bristol
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White Papers
Mobile WiMAX: Multi-Cell Network Evaluation and Capacity Optimization
January 13, 2009, 12:00am PST
The performance of a mobile WiMAX system is highly dependent on the application environment. Local clutter has a significant impact on the path loss exponent and the observed multipath statistics....
Provided by University of Bristol
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White Papers
Financial Structure And Corporate Growth: Evidence From Italian Panel Data
September 1, 2008, 12:00am PDT
The authors study the relationships between firm financial structure and growth for a large sample of Italian firms (1998-2003). They expand upon existing analyses testing whether liquidity...
Provided by University of Bristol
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White Papers
An Evaluation of Hash Functions on a Power Analysis Resistant Processor Architecture
December 1, 2010, 12:00am PST
Cryptographic hash functions are omnipresent components in security-critical software and devices; they support, for example, digital signature and data authenticity schemes, mechanisms for key...
Provided by University of Bristol
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White Papers
Research Challenges for Enterprise Cloud Computing
January 15, 2010, 12:00am PST
Cloud computing represents a shift away from computing as a product that is purchased, to computing as a service that is delivered to consumers over the internet from large-scale data centers - or...
Provided by University of Bristol
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White Papers
Research Agenda in Cloud Technologies
January 19, 2010, 12:00am PST
Cloud computing is the latest effort in delivering computing resources as a service. It represents a shift away from computing as a product that is purchased, to computing as a service that is...
Provided by University of Bristol
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White Papers
Fully Homomorphic SIMD Operations
March 15, 2011, 12:00am PDT
At PKC 2010 Smart and Vercauteren presented a variant of Gentry's fully homomorphic public key encryption scheme and mentioned that the scheme could support SIMD style operations. The slow key...
Provided by University of Bristol
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White Papers
Adaptive Pseudo-Free Groups and Applications
January 27, 2011, 12:00am PST
A computational group is pseudo-free if an adversary cannot find solutions in this group for equations that are not trivially solvable in the free group. This notion was put forth by Rivest as a...
Provided by University of Bristol
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White Papers
Differential Fault Analysis of AES Using a Single Multiple-Byte Fault
December 14, 2010, 12:00am PST
In this paper the authors present an improved fault attack on the Advanced Encryption Standard (AES). This paper presents an improvement on a recently published differential fault analysis of AES...
Provided by University of Bristol
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White Papers
Efficient Two-Move Blind Signatures in the Common Reference String Model
January 13, 2011, 12:00am PST
Blind signatures provide a mechanism for achieving privacy and anonymity whereby a user gets the signer to sign a message of his choice without the signer learning the content of the message, nor...
Provided by University of Bristol
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White Papers
On CCA-Secure Fully Homomorphic Encryption
March 10, 2011, 12:00am PST
It is well known that any encryption scheme which supports any form of homomorphic operation cannot be secure against adaptive chosen ciphertext attacks. The question then arises as to what is the...
Provided by University of Bristol
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White Papers
Side-Channel Attacks on the McEliece and Niederreiter Public-Key Cryptosystems
September 14, 2010, 12:00am PDT
Research within "Post-quantum" cryptography has focused on development of schemes that resist quantum cryptanalysis. However, if such schemes are to be deployed, practical questions of efficiency...
Provided by University of Bristol
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White Papers
Constructing Certificateless Encryption and ID-Based Encryption From ID-Based Key Agreement
August 30, 2010, 12:00am PDT
The authors discuss the relationship between ID-based key agreement protocols, certificateless encryption and ID-based key encapsulation mechanisms. In particular they show how in some sense...
Provided by University of Bristol
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White Papers
Fully Homomorphic Encryption With Relatively Small Key and Ciphertext Sizes
December 22, 2009, 12:00am PST
The authors present a fully homomorphic encryption scheme which has both relatively small key and ciphertext size. The construction follows that of Gentry by producing a fully homomorphic scheme...
Provided by University of Bristol
-
White Papers
Differential Fault Analysis of the Advanced Encryption Standard Using a Single Fault
February 17, 2011, 12:00am PST
In this paper the authors present a differential fault attack that can be applied to the AES using a single fault. They demonstrate that when a single random byte fault is induced at the input of...
Provided by University of Bristol
-
White Papers
Identity Based Group Signatures From Hierarchical Identity-Based Encryption
July 1, 2009, 12:00am PDT
A number of previous papers explored the notion of identity-based group signature. The authors present a generic construction of identity-based group signatures. The construction is based on the...
Provided by University of Bristol
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White Papers
Improved Trace-Driven Cache-Collision Attacks against Embedded AES Implementations
September 23, 2010, 12:00am PDT
In this paper the authors present two attacks that exploit cache events, which are visible in some side channel, to derive a secret key used in an implementation of AES. The first is an...
Provided by University of Bristol
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White Papers
Explicit Probabilistic Models for Databases and Networks
June 29, 2009, 12:00am PDT
Recent work in data mining and related areas has highlighted the importance of the statistical assessment of data mining results. Crucial to this endeavour is the choice of a non-trivial null...
Provided by University of Bristol
-
White Papers
Interference Alignment-Based Sum Capacity Bounds for Random Dense Gaussian Interference Networks
July 29, 2009, 12:00am PDT
The authors consider a dense K user Gaussian interference network formed by paired transmitters and receivers placed independently at random in a fixed spatial region. Under natural conditions on...
Provided by University of Bristol
-
White Papers
Finding Overlapping Communities in Networks by Label Propagation
September 26, 2010, 12:00am PDT
The authors propose an algorithm for finding overlapping community structure in very large networks. The algorithm is based on the label propagation technique of Raghavan, Albert, and Kumara, but...
Provided by University of Bristol
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White Papers
Robustness Guarantees for Anonymity
May 4, 2010, 12:00am PDT
Anonymous communication protocols must achieve two seemingly contradictory goals: privacy (informally, they must guarantee the anonymity of the parties that send/receive information), and...
Provided by University of Bristol
-
White Papers
Analysis of the SSH Key Exchange Protocol
May 28, 2011, 12:00am PDT
The authors provide an analysis of the widely deployed SSH protocol's key exchange mechanism. They exploit the design of the SSH key exchange to perform the analysis in a modular manner. First, a...
Provided by University of Bristol
-
White Papers
Using the Cloud to Determine Key Strengths
May 23, 2011, 12:00am PDT
The authors develop a new methodology to assess cryptographic key strength using cloud computing, by calculating the true economic cost of (symmetric- or private-) key retrieval for the most...
Provided by University of Bristol
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White Papers
Childhood Mortality and Economic Growth
January 1, 2008, 12:00am PST
This paper investigates the extent to which the decline in childhood mortality over the last three decades can be attributed to economic growth. In doing this, it exploits the considerable...
Provided by University of Bristol
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Whitepapers
Model-Based Intrusion Detection for Home Area Networks in Smart Grids
April 10, 2012, 12:00am PDT
In this paper, the authors present a model-based Intrusion Detection System (IDS) for Home Area Networks (HANs) within the smart grid. Considering that ZigBee is the dominant technology in future...
Provided by University of Bristol
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Whitepapers
An Optimal Energy Allocation Algorithm for Energy Harvesting Wireless Sensor Networks
May 24, 2012, 12:00am PDT
With the use of energy harvesting technologies, the lifetime of a Wireless Sensor Network (WSN) can be prolonged significantly. Unlike a traditional WSN powered by non-rechargeable batteries, the...
Provided by University of Bristol
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Whitepapers
Dual-hop Amplify-and-Forward Transmission With Imperfect Channel Estimates at the Relay
May 24, 2012, 12:00am PDT
With reference to the typical three-node Amplify-and-Forward (AF) relaying setup, where a single relay assists the communication between a source terminal and a destination terminal, the authors...
Provided by University of Bristol
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Whitepapers
Optimal Power Allocation in a Multi-Hop Decode-and-Forward Communication System
May 24, 2012, 12:00am PDT
This paper analyzes optimal power allocation schemes for a multi-hop decode-and-forward relay system in a Rayleigh fading environment at high signal-to-noise ratio. Analysis is done for two kinds...
Provided by University of Bristol
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Whitepapers
Efficient Authentication and Key Management for the Home Area Network
May 24, 2012, 12:00am PDT
Due to the extensive use of wireless technologies, security is one of the most important and challenging issues in smart grid networks. To secure data communications, strong authentication and key...
Provided by University of Bristol
-
Whitepapers
Robust Power Allocation Designs for Cognitive Radio Networks With Cooperative Relays
May 24, 2012, 12:00am PDT
In this paper, the authors develop robust power allocation schemes for Cognitive Radio Networks (CRNs) that can operate in multiple bands with cooperative relays considering uncertainty among the...
Provided by University of Bristol
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Whitepapers
Power Line Network Topology Inference Using Frequency Domain Reflectometry
May 24, 2012, 12:00am PDT
Frequency Domain Reflectometry (FDR) is a technique that was proposed for fault detection in Digital Subscriber Line (DSL) cables. In this paper, the authors describe how FDR can be used to...
Provided by University of Bristol
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Whitepapers
Distance Based Heuristic for Power and Rate Allocation of Video Sensor Networks
March 12, 2012, 12:00am PDT
Video Sensor Networks (VSNs) offer an alternative to several existing surveillance technologies. However, unlike in conventional sensor network, video processing and transmission requires large...
Provided by University of Bristol
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Whitepapers
Distributed Dynamic Scheduling for Body Area Networks
March 12, 2012, 12:00am PDT
Body Area Networks (BANs), targeting everywhere anytime health monitoring, operate in license-exempt frequency bands. They require a cross layer design that jointly considers the requirements of...
Provided by University of Bristol
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Whitepapers
Subcarrier and Power Adaptation for Multiuser OFDMA-Based Cognitive Radio Systems
December 31, 2009, 12:00am PST
This paper investigates the subcarrier and power allocation problem for an OFDM-based multiuser Cognitive Radio (CR) system. For CR systems it is important to keep the interference introduced to...
Provided by University of Bristol
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Whitepapers
On Extracting Unit Tests From Interactive Programming Sessions
December 8, 2012, 12:00am PST
Software engineering methodologies propose that developers should capture their efforts in ensuring that programs run correctly in repeatable and automated artifacts, such as unit tests. However,...
Provided by University of Bristol
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Whitepapers
Towards Building Error Resilient GPGPU Applications
November 28, 2012, 12:00am PST
GPUs (Graphics Processing Units) have gained wide adoption as accelerators for general purpose computing. They are widely used in error-sensitive applications, i.e. General Purpose GPU (GPGPU)...
Provided by University of Bristol
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Whitepapers
On Graphs, GPUs, and Blind Dating a Workload to Processor Matchmaking Quest
January 10, 2013, 12:00am PST
Graph processing has gained renewed attention. The increasing large scale and wealth of connected data, such as those accrued by social network applications, demand the design of new techniques...
Provided by University of Bristol
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Whitepapers
Avoiding the Disk Bottleneck in Deduplicated VM Transfer
May 31, 2012, 12:00am PDT
Data de-duplication is a commonly adopted optimization in the cloud infrastructure for optimizing the storage and the transfer of Virtual Machines (VM). Data de-duplication efficiently identifies...
Provided by University of Bristol
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Whitepapers
Key Challenges in Defending Against Malicious Socialbots
March 26, 2012, 12:00am PDT
The ease with which the authors adopt online personas and relationships has created a soft spot that cyber criminals are willing to exploit. Advances in artificial intelligence make it feasible to...
Provided by University of Bristol
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Whitepapers
Multiple-Symbol Differential Decision Fusion for Mobile Wireless Sensor Networks
October 27, 2009, 12:00am PDT
The authors consider the problem of decision fusion in mobile Wireless Sensor Networks where the channels between the sensors and the fusion center are time - variant. They assume that the sensors...
Provided by University of Bristol
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Whitepapers
Relay Selection for Simultaneous Information Transmission and Wireless Energy Transfer: A Tradeoff Perspective
March 7, 2013, 12:00am PST
In certain applications, relay terminals can be employed to simultaneously deliver information and energy to a designated receiver and a Radio Frequency (RF) energy harvester, respectively. In...
Provided by University of Bristol
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Whitepapers
Multiple - Symbol Differential Decision Fusion for Mobile Wireless Sensor Networks
March 12, 2009, 12:00am PDT
The authors consider the problem of decision fusion in mobile wireless sensor networks where the channels between the sensors and the fusion center are time - variant. They assume that the sensors...
Provided by University of Bristol
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Whitepapers
Full-Duplex Transmissions in Fiber-Connected Distributed Relay Antenna Systems
November 21, 2012, 12:00am PST
Distributed Antenna Systems (DAS) have been studied extensively to improve spectral efficiency and extend coverage. Different from the previous studies that focused mostly on the enhancement of...
Provided by University of Bristol
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Whitepapers
Transmit Antenna Selection for Security Enhancement in MIMO Wiretap Channels
July 14, 2012, 12:00am PDT
Information security has become a pivotal concern in wireless communications, due to the fact that the broadcast nature of the wireless medium allows eavesdroppers to intercept transmissions in...
Provided by University of Bristol
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Whitepapers
NLOS Identification Using a Hybrid ToA-Signal Strength Algorithm for Underwater Acoustic Localization
July 15, 2010, 12:00am PDT
The existence of obstacles in harbors or near shore environments leads to Non-Line-Of-Sight (NLOS) links between two UnderWater Acoustic Communication (UWAC) nodes. That is, only echoes of the...
Provided by University of Bristol
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Whitepapers
LOS and NLOS Classification for Underwater Acoustic Localization
May 8, 2012, 12:00am PDT
The low sound speed in water makes Propagation Delay (PD) based range estimation attractive for UnderWater Acoustic Localization (UWAL). However, due to the long channel impulse response and the...
Provided by University of Bristol
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Whitepapers
GPUs as Storage System Accelerators
May 16, 2012, 12:00am PDT
Massively multicore processors, such as Graphics Processing Units (GPUs), provide, at a comparable price, a one order of magnitude higher peak performance than traditional CPUs. This drop in the...
Provided by University of Bristol
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Whitepapers
Key Challenges in Defending Against Malicious Socialbots
March 26, 2012, 12:00am PDT
The ease with which the authors adopt online personas and relationships has created a soft spot that cyber criminals are willing to exploit. Advances in artificial intelligence make it feasible to...
Provided by University of Bristol
-
Whitepapers
Avoiding the Disk Bottleneck in Deduplicated VM Transfer
May 31, 2012, 12:00am PDT
Data de-duplication is a commonly adopted optimization in the cloud infrastructure for optimizing the storage and the transfer of Virtual Machines (VM). Data de-duplication efficiently identifies...
Provided by University of Bristol
-
Whitepapers
On Graphs, GPUs, and Blind Dating a Workload to Processor Matchmaking Quest
January 10, 2013, 12:00am PST
Graph processing has gained renewed attention. The increasing large scale and wealth of connected data, such as those accrued by social network applications, demand the design of new techniques...
Provided by University of Bristol
-
Whitepapers
Towards Building Error Resilient GPGPU Applications
November 28, 2012, 12:00am PST
GPUs (Graphics Processing Units) have gained wide adoption as accelerators for general purpose computing. They are widely used in error-sensitive applications, i.e. General Purpose GPU (GPGPU)...
Provided by University of Bristol
-
Whitepapers
On Extracting Unit Tests From Interactive Programming Sessions
December 8, 2012, 12:00am PST
Software engineering methodologies propose that developers should capture their efforts in ensuring that programs run correctly in repeatable and automated artifacts, such as unit tests. However,...
Provided by University of Bristol
-
Whitepapers
Subcarrier and Power Adaptation for Multiuser OFDMA-Based Cognitive Radio Systems
December 31, 2009, 12:00am PST
This paper investigates the subcarrier and power allocation problem for an OFDM-based multiuser Cognitive Radio (CR) system. For CR systems it is important to keep the interference introduced to...
Provided by University of Bristol
-
Whitepapers
Distributed Dynamic Scheduling for Body Area Networks
March 12, 2012, 12:00am PDT
Body Area Networks (BANs), targeting everywhere anytime health monitoring, operate in license-exempt frequency bands. They require a cross layer design that jointly considers the requirements of...
Provided by University of Bristol
-
Whitepapers
Distance Based Heuristic for Power and Rate Allocation of Video Sensor Networks
March 12, 2012, 12:00am PDT
Video Sensor Networks (VSNs) offer an alternative to several existing surveillance technologies. However, unlike in conventional sensor network, video processing and transmission requires large...
Provided by University of Bristol
-
Whitepapers
Power Line Network Topology Inference Using Frequency Domain Reflectometry
May 24, 2012, 12:00am PDT
Frequency Domain Reflectometry (FDR) is a technique that was proposed for fault detection in Digital Subscriber Line (DSL) cables. In this paper, the authors describe how FDR can be used to...
Provided by University of Bristol
-
Whitepapers
Robust Power Allocation Designs for Cognitive Radio Networks With Cooperative Relays
May 24, 2012, 12:00am PDT
In this paper, the authors develop robust power allocation schemes for Cognitive Radio Networks (CRNs) that can operate in multiple bands with cooperative relays considering uncertainty among the...
Provided by University of Bristol
-
Whitepapers
Efficient Authentication and Key Management for the Home Area Network
May 24, 2012, 12:00am PDT
Due to the extensive use of wireless technologies, security is one of the most important and challenging issues in smart grid networks. To secure data communications, strong authentication and key...
Provided by University of Bristol
-
Whitepapers
Optimal Power Allocation in a Multi-Hop Decode-and-Forward Communication System
May 24, 2012, 12:00am PDT
This paper analyzes optimal power allocation schemes for a multi-hop decode-and-forward relay system in a Rayleigh fading environment at high signal-to-noise ratio. Analysis is done for two kinds...
Provided by University of Bristol
-
Whitepapers
Dual-hop Amplify-and-Forward Transmission With Imperfect Channel Estimates at the Relay
May 24, 2012, 12:00am PDT
With reference to the typical three-node Amplify-and-Forward (AF) relaying setup, where a single relay assists the communication between a source terminal and a destination terminal, the authors...
Provided by University of Bristol
-
Whitepapers
An Optimal Energy Allocation Algorithm for Energy Harvesting Wireless Sensor Networks
May 24, 2012, 12:00am PDT
With the use of energy harvesting technologies, the lifetime of a Wireless Sensor Network (WSN) can be prolonged significantly. Unlike a traditional WSN powered by non-rechargeable batteries, the...
Provided by University of Bristol
-
Whitepapers
Model-Based Intrusion Detection for Home Area Networks in Smart Grids
April 10, 2012, 12:00am PDT
In this paper, the authors present a model-based Intrusion Detection System (IDS) for Home Area Networks (HANs) within the smart grid. Considering that ZigBee is the dominant technology in future...
Provided by University of Bristol
-
White Papers
Combinatorial Channel Signature Modulation for Wireless Ad-Hoc Networks
January 26, 2012, 12:00am PST
In this paper, the authors introduce a novel modulation and multiplexing method which facilitates highly efficient and simultaneous communication between multiple terminals in wireless ad-hoc...
Provided by University of Bristol
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White Papers
A Family of Key Agreement Mechanisms for Mission Critical Communications for Secure Mobile Ad Hoc and Wireless Mesh Internetworking
September 17, 2010, 12:00am PDT
Future wireless networks like mobile ad hoc networks and wireless mesh networks are expected to play important role in demanding communications such as mission critical communications. MANETs are...
Provided by University of Bristol
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White Papers
Modelling Resilience in Cloud-Scale Data Centres
June 14, 2011, 12:00am PDT
The trend for cloud computing has initiated a race towards Data Centers (DC) of an ever-increasing size. The largest DCs now contain many hundreds of thousands of Virtual Machine (VM) services....
Provided by University of Bristol
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White Papers
SPECI-2 an Open-Source Framework for Predictive Simulation of Cloud-Scale Data-Centres
June 27, 2011, 12:00am PDT
The authors introduce Version 2 of SPECI (Simulation Program for Elastic Computing Infrastructure), a system for predictive simulation modelling of ultra-largescale Data-Centers (DCs), i.e....
Provided by University of Bristol
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White Papers
To Trade Or Not To Trade: The Strategic Trading Of Insiders Around News Announcements
June 21, 2007, 12:00am PDT
In this paper, the authors analyze the strategic trading of insiders and the way insiders use short-lived private information. They argue that the decisions to trade or not to trade on...
Provided by University of Bristol
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White Papers
Predicting The Corporate Failure Of Non-Listed Companies
September 1, 2007, 12:00am PDT
Employing a unique sample consisting of over 10,000 unlisted firms which fail in the year 2005, the authors undertake a comprehensive analysis of the determinants of corporate failure among...
Provided by University of Bristol
-
White Papers
Childhood Mortality and Economic Growth
January 1, 2008, 12:00am PST
This paper investigates the extent to which the decline in childhood mortality over the last three decades can be attributed to economic growth. In doing this, it exploits the considerable...
Provided by University of Bristol
-
White Papers
Using the Cloud to Determine Key Strengths
May 23, 2011, 12:00am PDT
The authors develop a new methodology to assess cryptographic key strength using cloud computing, by calculating the true economic cost of (symmetric- or private-) key retrieval for the most...
Provided by University of Bristol
-
White Papers
Analysis of the SSH Key Exchange Protocol
May 28, 2011, 12:00am PDT
The authors provide an analysis of the widely deployed SSH protocol's key exchange mechanism. They exploit the design of the SSH key exchange to perform the analysis in a modular manner. First, a...
Provided by University of Bristol
-
White Papers
Robustness Guarantees for Anonymity
May 4, 2010, 12:00am PDT
Anonymous communication protocols must achieve two seemingly contradictory goals: privacy (informally, they must guarantee the anonymity of the parties that send/receive information), and...
Provided by University of Bristol
-
White Papers
Finding Overlapping Communities in Networks by Label Propagation
September 26, 2010, 12:00am PDT
The authors propose an algorithm for finding overlapping community structure in very large networks. The algorithm is based on the label propagation technique of Raghavan, Albert, and Kumara, but...
Provided by University of Bristol
-
White Papers
Interference Alignment-Based Sum Capacity Bounds for Random Dense Gaussian Interference Networks
July 29, 2009, 12:00am PDT
The authors consider a dense K user Gaussian interference network formed by paired transmitters and receivers placed independently at random in a fixed spatial region. Under natural conditions on...
Provided by University of Bristol
-
White Papers
Explicit Probabilistic Models for Databases and Networks
June 29, 2009, 12:00am PDT
Recent work in data mining and related areas has highlighted the importance of the statistical assessment of data mining results. Crucial to this endeavour is the choice of a non-trivial null...
Provided by University of Bristol
-
White Papers
Improved Trace-Driven Cache-Collision Attacks against Embedded AES Implementations
September 23, 2010, 12:00am PDT
In this paper the authors present two attacks that exploit cache events, which are visible in some side channel, to derive a secret key used in an implementation of AES. The first is an...
Provided by University of Bristol
-
White Papers
Identity Based Group Signatures From Hierarchical Identity-Based Encryption
July 1, 2009, 12:00am PDT
A number of previous papers explored the notion of identity-based group signature. The authors present a generic construction of identity-based group signatures. The construction is based on the...
Provided by University of Bristol
-
White Papers
Differential Fault Analysis of the Advanced Encryption Standard Using a Single Fault
February 17, 2011, 12:00am PST
In this paper the authors present a differential fault attack that can be applied to the AES using a single fault. They demonstrate that when a single random byte fault is induced at the input of...
Provided by University of Bristol
-
White Papers
Fully Homomorphic Encryption With Relatively Small Key and Ciphertext Sizes
December 22, 2009, 12:00am PST
The authors present a fully homomorphic encryption scheme which has both relatively small key and ciphertext size. The construction follows that of Gentry by producing a fully homomorphic scheme...
Provided by University of Bristol
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