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UC Regents
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White Papers
Detection of VM-Aware Malware
December 11, 2007, 12:00am PST
VM-aware malware is a class of malicious software that can detect whether it is running in a virtualized environment and alter its behavior based on this result. As much of today's malware...
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White Papers
Scaling Into the Cloud
March 10, 2009, 12:00am PDT
As the use of cloud computing becomes more prevalent among popular web services, the issue arise of effectively scaling resources in the cloud. There are services that provide scaling...
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White Papers
Long-Reach Passive Optical Networks
June 10, 2009, 12:00am PDT
With the advances in optical technology, the span of a broadband access network using Passive Optical Network (PON) technology can be increased from today's standard of 20 km to 100 km or higher....
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White Papers
How Does Information Technology Shape Supply Chain Structure?: Evidence On The Number Of Suppliers
September 19, 2008, 12:00am PDT
This research investigates the relationship between a manufacturer's use of information technology (particularly electronic procurement) and the number of suppliers in its supply chain. Will a...
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White Papers
Ziv-Lempel Data Compression
October 2, 2009, 12:00am PDT
Large text or graphics files are often compressed in order to save storage space or to speed up transmission when the file is shipped. Most operating systems have compression utilities, and some...
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White Papers
Development And Freedom As Risk Management
September 8, 2010, 12:00am PDT
The author has argued that many development and freedom measures such as health, education, political and civil liberties are important constituents of human welfare. The author concur with...
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White Papers
The ExoVM System for Automatic VM and Application Reduction
December 12, 2008, 12:00am PST
Developing embedded systems software poses unique challenges to Java application developers and virtual machine designers. Chief among these challenges is the memory footprint of both the virtual...
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White Papers
A Data-First Architecture for Unstructured Wireless Networks
October 1, 2010, 12:00am PDT
The authors have returned to the drawing board to rethink the basic approach to unstructured wireless networks connected or disconnected multi-hop wireless networks whose topology is in a constant...
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White Papers
Performance Assessment of a Commercial GPS Receiver for Networking Applications
August 30, 2007, 12:00am PDT
Recent years have seen an exponential increase of DVD equipped and navigation assisted cars. Nowadays a car trip can be both entertaining for passengers and computer assisted for drivers. In a...
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White Papers
Induced Churn as Shelter From Routing-Table Poisoning
January 1, 2011, 12:00am PST
Structured overlays are an important and powerful class of overlay networks that has emerged in recent years. They are typically targeted at peer-to-peer deployments involving millions of...
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White Papers
AZALIA: An A to Z Assessment of the Likelihood of Insider Attack
April 30, 2009, 12:00am PDT
The insider threat problem is increasing, both in terms of the number of incidents and their financial impact. To date, solutions have been developed to detect specific instances of insider...
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White Papers
Some "Secure Programming" Exercises for an Introductory Programming Class
June 28, 2009, 12:00am PDT
Ideally, computer security should be an integral part of all programming courses. Beginning programming classes pose a particular challenge, because the students are learning basic concepts of...
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White Papers
Reflections on UNIX Vulnerabilities
September 25, 2009, 12:00am PDT
The UNIX operating system was developed in a friendly, collaborative environment without any particular predefined objectives. As it entered less friendly environments, expanded its functionality,...
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White Papers
Ten Years Past and Ten Years From Now
September 20, 2010, 12:00am PDT
Ten years ago, computer security was an arcane discipline that many academics did not see as an interesting or deep research area. Today, that perception has changed. Information assurance and...
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White Papers
Quantitative Data Cleaning for Large Databases
February 27, 2008, 12:00am PST
Data collection has become a ubiquitous function of large organizations not only for record keeping, but to support a variety of data analysis tasks that are critical to the organizational...
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White Papers
Capacity Region of the Deterministic Multi-Pair Bi-Directional Relay Network
March 15, 2009, 12:00am PDT
This paper the authors study the capacity region of the multi-pair bidirectional (or two-way) wireless relay network, in which a relay node facilitates the communication between multiple pairs of...
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White Papers
Joint Guidance on the Application of the Family Educational Rights and Privacy Act (FERPA) and the Health Insurance Portability and Accountability Act of 1996 (HIPAA) to Student Health Records
November 1, 2008, 12:00am PDT
The purpose of this guidance is to explain the relationship between the Family Educational Rights and Privacy Act (FERPA) and the Health Insurance Portability and Accountability Act of 1996...
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White Papers
Adaptive Methods for Linear Programming Decoding
February 1, 2008, 12:00am PST
Detectability of failures of Linear Programming (LP) decoding and the potential for improvement by adding new constraints motivate the use of an adaptive approach in selecting the constraints for...
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White Papers
Deterministic Relay Networks With State Information
May 20, 2009, 12:00am PDT
Motivated by fading channels and erasure channels, the problem of reliable communication over deterministic relay networks is studied, in which relay nodes receive a function of the incoming...
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White Papers
Resettable Public-Key Encryption: How to Encrypt on a Virtual Machine
September 24, 2009, 12:00am PDT
Typical security models used for proving security of deployed cryptographic primitives do not allow adversaries to rewind or reset honest parties to an earlier state. Thus, it is common to see...
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White Papers
Secure Message Transmission With Small Public Discussion
November 2, 2009, 12:00am PST
In the problem of Secure Message Transmission in the Public Discussion model (SMT-PD), a Sender wants to send a message to a Receiver privately and reliably. Sender and Receiver are connected by n...
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White Papers
Position Based Cryptography
July 21, 2009, 12:00am PDT
The authors consider what constitutes identities in cryptography. Typical examples include people's name and social-security number, or their Fingerprint/iris-scan, or their address, or their...
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White Papers
Fuzzy Privacy Preserving Peer-to-Peer Reputation Management
September 21, 2009, 12:00am PDT
The P2PRep algorithm is a reputation-management mechanism in which a peer uses fuzzy techniques to compute local reputations and aggregates these results to compute a global reputation for another...
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White Papers
A Public Key Encryption Scheme Secure Against Key Dependent Chosen Plaintext and Adaptive Chosen Ciphertext Attacks
January 16, 2009, 12:00am PST
Recently, at Crypto 2008, Boneh, Halevi, Hamburg, and Ostrovsky (BHHO) solved the longstanding open problem of "Circular encryption," by presenting a public key encryption scheme and proving that...
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White Papers
Reducing Trust in the PKG in Identity Based Cryptosystems
December 4, 2007, 12:00am PST
One day, people suddenly find that a private key corresponding to their Identity is up for sale at e-Bay. Since people do not suspect a key compromise, perhaps it must be the PKG who is acting...
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White Papers
New Constructions for UC Secure Computation Using Tamper-Proof Hardware
October 7, 2010, 12:00am PDT
The Universal Composability framework was introduced by Canetti to study the security of protocols which are concurrently executed with other protocols in a network environment. Unfortunately it...
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White Papers
A Replicated Monitoring Tool
January 1, 2011, 12:00am PST
Modeling the reliability of distributed systems requires a good understanding of the reliability of the components. Careful modeling allows highly fault-tolerant distributed applications to be...
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White Papers
On Improving the Availability of Replicated Files
January 1, 2011, 12:00am PST
To improve the availability and reliability of les the data are often replicated at several sites. A scheme must then be chosen to maintain the consistency of the le contents in the presence of...
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White Papers
Exploiting Multiple I/O Streams to Provide High Data-Rates
January 1, 2011, 12:00am PST
The authors present an I/O architecture, called Swift, that addresses the problem of data-rate mismatches between the requirements of an application, the maximum data-rate of the storage devices,...
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White Papers
A Dynamic Disk Spin-Down Technique for Mobile Computing
January 1, 2011, 12:00am PST
The authors address the problem of deciding when to spin down the disk of a mobile computer in order to extend battery life. Since one of the most critical resources in mobile computing...
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White Papers
Using an Object-Oriented Framework to Construct Wide-Area Group Communication Mechanisms
January 1, 2011, 12:00am PST
Many wide-area distributed applications, including distributed databases, can be implemented using a group communication mechanism. The authors have developed a family of weak-consistency group...
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White Papers
A Realistic Evaluation of Consistency Algorithms for Replicated Files
May 20, 2010, 12:00am PDT
Data are often replicated in distributed systems to protect them against site failures and network malfunctions. When this is the case, an access policy must be chosen to insure that a consistent...
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White Papers
Storing and Querying Multiversion XML Documents Using Durable Node Numbers
January 1, 2011, 12:00am PST
Managing multiple versions of XML documents represents an important problem for many traditional applications, such as software configuration control, as well as new ones, such as link permanence...
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White Papers
A Taxonomy of Buffer Overflow Preconditions
January 1, 2010, 12:00am PST
Recent work on vulnerabilities has focused on buffer overflows, in which data exceeding the bounds of an array is loaded into the array. The loading continues past the end of the array, causing...
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White Papers
Scalable Detection of Similar Code: Techniques and Applications
December 1, 2009, 12:00am PST
Similar code, also known as cloned code, commonly exists in large software. Studies show that code duplication can incur higher software maintenance cost and more software defects. Thus, detecting...
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White Papers
Prediction and Management in Energy Harvested Wireless Sensor Nodes
March 9, 2009, 12:00am PDT
Solar panels are frequently used in wireless sensor nodes because they can theoretically provide quite a bit of harvested energy. However, they are not a reliable, consistent source of energy...
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White Papers
Management of Solar Harvested Energy in Actuation-Based and Event-Triggered Systems
April 17, 2008, 12:00am PDT
Today's sensing applications require low energy consumption while managing various types of tasks, ranging from processing and communication, to actuation and sensing. In this paper the authors...
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White Papers
Analysis of Dynamic Voltage Scaling for System Level Energy Management
November 13, 2008, 12:00am PST
In this paper the authors show that in modern computing systems, DVFS gives much more limited energy savings with relatively high performance overhead as compared to running workloads at high...
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White Papers
An Energy Efficient Wireless Communication Mechanism for Sensor Node Cluster Heads
October 1, 2009, 12:00am PDT
This paper presents an efficient mechanism to achieve significant energy savings in heterogeneous wireless sensor networks such as HPWREN. Environmental sensors are typically located in remote and...
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White Papers
Modeling and Dynamic Management of 3D Multicore Systems With Liquid Cooling
January 1, 2011, 12:00am PST
Three-Dimensional (3D) circuits reduce communication delay in multicore SoCs, and enable efficient integration of cores, memories, sensors, and RF devices. However, vertical integration of layers...
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White Papers
An Evaluation of Peer-to-Peer File Sharing on the Android Mobile Platform
February 23, 2010, 12:00am PST
Handheld mobile devices are at the forefront of technology today. Every manufacturer is looking to reduce the size of their product while increasing its usability at the same time. With the...
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White Papers
On the Symmetry of User Mobility in Wireless Networks
May 2, 2011, 12:00am PDT
In this paper analyzed WLAN - GPS -and synthetic traces that record mobility in a variety of network environments. The authors observe that from a macroscopic level, human mobility is symmetric....
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White Papers
Decentralized Cognitive Radio Control Based on Inference From Primary Link Control Information
May 26, 2010, 12:00am PDT
This paper on cognitive radio access ventures beyond the more traditional "Listen-before-talk" paradigm that underlies many cognitive radio access proposals. The authors exploit the bi-directional...
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White Papers
Identity-Based Access Control for Ad Hoc Groups
January 1, 2011, 12:00am PST
The proliferation of group-centric computing and communication motivates the need for mechanisms to provide group access control. Group access control includes mechanisms for admission as well as...
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White Papers
PRoPHET+: An Adaptive PRoPHET-Based Routing Protocol for Opportunistic Network
February 2, 2010, 12:00am PST
The authors propose PRoPHET+, a routing scheme for opportunistic networks designed to maximize successful data delivery rate and minimize transmission delay. PRoPHET+ computes a deliverability...
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White Papers
Adaptive Clustering for Mobile Wireless Networks
October 10, 2008, 12:00am PDT
This paper describes a self-organizing, multi-hop, mobile radio network, which relies on a code division access scheme for multimedia support. In the proposed network architecture, nodes are...
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White Papers
Understanding Congestion in IEEE 802.11b Wireless Networks
January 1, 2011, 12:00am PST
The growing popularity of wireless networks has led to cases of heavy utilization and congestion. In heavily utilized wireless networks, the wireless portion of the network is a major performance...
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White Papers
Dynamic Test Generation To Find Integer Bugs in x86 Binary Linux Programs
June 2, 2009, 12:00am PDT
Recently, integer bugs, including integer overflow, width conversion, and signed/unsigned conversion errors, have risen to become a common root cause for serious security vulnerabilities. The...
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White Papers
Fast Mixing of Parallel Glauber Dynamics and Low-Delay CSMA Scheduling
August 2, 2010, 12:00am PDT
Glauber dynamics is a powerful tool to generate randomized, approximate solutions to combinatorially difficult problems. It has been used to analyze and design distributed CSMA (Carrier Sense...
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White Papers
Bit Allocation of WWAN Scalable H.264 Video Multicast for Heterogeneous Cooperative Peer-to-Peer Collective
January 1, 2010, 12:00am PST
By exploiting multiple network interfaces on one device, e.g., Wireless Wide Area Network (WWAN) and Wireless Local Area Network (WLAN), peers receiving different subsets of WWAN...
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White Papers
LEISURE: A Framework for Load-Balanced Network-Wide Traffic Measurement
August 12, 2011, 12:00am PDT
Network-wide traffic measurement is of interest to network operators to uncover global network behavior for the management tasks of traffic accounting, debugging or troubleshooting, security, and...
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White Papers
Comparative Cost Study of Broadband Access Technologies
October 22, 2008, 12:00am PDT
This paper provides a simple techno-economic study of various access network technologies for broadband data service delivery, including their deployment cost analysis. This paper compares the...
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White Papers
Optimal Capacity Allocation in Wireless Mesh Networks
March 30, 2008, 12:00am PDT
The authors address the problem of "Capacity Allocation" in Wireless Mesh Networks (WMNs). In the "Capacity Allocation" problem, the network topology (namely the desired wireless links) and...
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White Papers
Link Scheduling and Power Control in Wireless Mesh Networks With Directional Antennas
September 27, 2007, 12:00am PDT
Directional antennas are very attractive in Wireless Mesh Networks (WMN). The authors study the problem of link scheduling and power control in a Time-Division Multiple Access (TDMA) WMN where the...
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White Papers
Directionality as Needed - Achieving Connectivity in Wireless Mesh Networks
September 27, 2007, 12:00am PDT
The authors study how to achieve a desired connectivity in a wireless mesh network using beamforming antennas. They show that there is no unique solution to this problem. Then, they propose a...
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White Papers
CaDAR: An Efficient Routing Algorithm for Wireless-Optical Broadband Access Network
January 1, 2011, 12:00am PST
Hybrid Wireless-Optical Broadband Access Network (WOBAN) is a combination of wireless and optical network to optimize the cost and performance of an access network. Wireless nodes collect traffic...
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White Papers
Capacity and Delay Aware Routing in Hybrid Wireless-Optical Broadband Access Network
October 22, 2007, 12:00am PDT
Hybrid Wireless-Optical Broadband Access Network (WOBAN) optimizes the cost and performance of an access network. The authors design a capacity and delay aware routing scheme, CaDAR, that can...
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White Papers
Flow-Aware Channel Assignment for Multi-Radio Wireless-Optical Broadband Access Network
November 2, 2008, 12:00am PDT
Hybrid Wireless-Optical Broadband Access Network (WOBAN) optimizes the cost and performance of an access network. A cost-effective way of increasing the capacity of the wireless part of a WOBAN is...
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White Papers
Empirical Modeling and Estimation of End-to-End VoIP Delay Over Mobile Multi-Hop Wireless Networks
October 18, 2010, 12:00am PDT
Voice-over-IP (VoIP) systems face the following two general constraints: a stringent end-to-end delay constraint of at most 500 ms has to be satisfied, including not only the end-to-end networking...
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White Papers
Quality-Oriented Video Delivery Over LTE Using Adaptive Modulation and Coding
March 20, 2011, 12:00am PDT
Long Term Evolution (LTE) is emerging as a major candidate for 4G cellular networks to satisfy the increasing demands for mobile broadband services, particularly multimedia delivery. MIMO...
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White Papers
Opportunistic Interference Management Increases the Capacity of Ad Hoc Networks
March 26, 2010, 12:00am PDT
Since the landmark work by Gupta and Kumar on the capacity of wireless ad hoc networks, considerable attention has been devoted to improving or analyzing their results. Ozgur et al. demonstrated...
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White Papers
Optimal Scaling of Multicommodity Flows in Wireless Ad Hoc Networks: Beyond the Gupta-Kumar Barrier
March 27, 2008, 12:00am PDT
The price, performance and form factors of sensors, processors, storage elements, and radios today are at a point that the age of viable large-scale ad-hoc networks would appear to be finally upon...
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White Papers
Capacity Scaling Laws of Information Dissemination Modalities in Wireless Ad Hoc Networks
June 30, 2008, 12:00am PDT
Gupta and Kumar studied the capacity of wireless ad hoc networks for the case of multi-pair unicasts in which the nodes are able to encode and decode at most one packet at a time. This paper has...
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White Papers
Capacity of Composite Networks: Combining Social and Wireless Ad Hoc Networks
January 5, 2011, 12:00am PST
The authors define composite networks when nodes communicate only with their long-range social contacts and there is no direct link between a node and its long-range contact. Each node has a...
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White Papers
Capacity of Wireless Networks With Heterogeneous Traffic Under Physical Model
February 19, 2010, 12:00am PST
The throughput capacity of wireless ad hoc networks is derived when the traffic is heterogeneous but the node distribution is homogeneous. For the heterogeneous traffic the authors consider two...
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White Papers
Antenna Selection for Opportunistic Interference Management in MIMO Broadcast Channels
April 8, 2010, 12:00am PDT
Multi-user diversity scheme is an alternative approach to more traditional techniques like Time Division Multiple Access (TDMA) to increase the capacity of wireless cellular networks. The main...
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White Papers
The Capacity of Ad Hoc Networks With Heterogeneous Traffic Using Cooperation
December 11, 2009, 12:00am PST
The authors study the scaling laws for wireless ad hoc networks in which the distribution of n nodes in the network is homogeneous but the traffic they carry is heterogeneous. They present a...
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White Papers
The Capacity of Multihop Relay Wireless Networks
March 31, 2010, 12:00am PDT
The throughput capacity of wireless ad hoc networks is an important topic that has been studied extensively in the literature. Most of these studies are based on the assumption that all the nodes...
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White Papers
Impact of Multi-Packet Transmission and Reception on Throughput Capacity of Wireless Ad Hoc Networks
April 19, 2010, 12:00am PDT
The authors study the capacity of random wireless ad hoc networks when nodes are capable Multi-Packet Transmission and Reception (MPTR). This paper extends the unified framework of (n, m and...
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White Papers
On the Minimum Side Information of MIMO Broadcast Channel
March 31, 2010, 12:00am PDT
The authors introduce a technique to achieve Dirty Paper Coding (DPC) capacity asymptotically with minimum feedback required reported to date in literature. Their approach called interference...
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White Papers
Proactive or Reactive Routing: A Unified Analytical Framework in MANETs
February 11, 2008, 12:00am PST
The authors present a mathematical framework for the performance evaluation of proactive and reactive routing protocols operating in Mobile Ad hoc NETworks (MANETs). The model captures the...
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White Papers
A Distributed Numerical Approach to Interference Alignment and Applications to Wireless Interference Networks
September 4, 2009, 12:00am PDT
Recent results establish the optimality of interference alignment to approach the Shannon capacity of interference networks at high SNR. However, the extent to which interference can be aligned...
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White Papers
Cognitive Radio Networks: How Much Spectrum Sharing Is Optimal?
August 8, 2007, 12:00am PDT
The authors explore the performance tradeoff between opportunistic and regulated access inherent in the design of multi-user cognitive radio networks. They consider a cognitive radio system with...
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White Papers
The Effects of MAC Protocols on Ad Hoc Network Communication
January 1, 2011, 12:00am PST
As mobile computing gains popularity, the need for ad hoc routing protocols will continue to grow. There have been numerous simulations comparing the performance of these protocols under varying...
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White Papers
MobiCom 2010 Poster: Frequency Quorum Rendezvous for Fast and Resilient Key Establishment Under Jamming Attack
November 8, 2010, 12:00am PST
Jamming attacks have been studied as wireless security threats disrupting reliable RF communication in a wireless network. Existing countermeasures often make use of spread-spectrum techniques...
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White Papers
Geo-Based Inter-Domain Routing (GIDR) Protocol for Manets
August 20, 2009, 12:00am PDT
Inter-domain routing for MANETs (Mobile Ad Hoc NETworks) draws increasing attention because of military and vehicular applications. The existing Border Gateway Protocol (BGP) is the de facto...
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White Papers
Decentralized Cognitive MAC for Dynamic Spectrum Access
January 1, 2011, 12:00am PST
The authors consider the problem of opportunistic Dynamic Spectrum Access (DSA) in an ad hoc network in which unlicensed secondary users communicate through channels not used by the primary users....
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White Papers
Network Coding Multicast Performance When Some Nodes Do Not Code
October 16, 2009, 12:00am PDT
Network coding was found to be useful for ad hoc wireless multicast in disruptive channel and connectivity conditions. In heterogeneous networks, comprising teams with different technical...
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White Papers
AutoGait: A Mobile Platform that Accurately Estimates the Distance Walked
January 27, 2010, 12:00am PST
AutoGait is a mobile platform that autonomously discovers a user's walking profile and accurately estimates the distance walked. The discovery is made by utilizing the GPS in the user's mobile...
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White Papers
Energy-Efficient Accelerometer Data Transfer for Human Body Movement Studies
March 21, 2010, 12:00am PDT
Wireless sensors with accelerometers are widely used in various studies on human body movements. The most challenging problem in a small body-attachable sensing unit is how to maximize the battery...
Provided by UC Regents
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