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2008

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Articles 721 - 750 of 1335

Full-Text Articles in Computer Sciences

Improving Liquid State Machines Through Iterative Refinement Of The Reservoir, R David Norton Mar 2008

Improving Liquid State Machines Through Iterative Refinement Of The Reservoir, R David Norton

Theses and Dissertations

Liquid State Machines (LSMs) exploit the power of recurrent spiking neural networks (SNNs) without training the SNN. Instead, a reservoir, or liquid, is randomly created which acts as a filter for a readout function. We develop three methods for iteratively refining a randomly generated liquid to create a more effective one. First, we apply Hebbian learning to LSMs by building the liquid with spike-time dependant plasticity (STDP) synapses. Second, we create an eligibility based reinforcement learning algorithm for synaptic development. Third, we apply principles of Hebbian learning and reinforcement learning to create a new algorithm called separation driven synaptic modification …

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Elimination Of Subjectivity From Trust Recommendation, Omas Hasan, Lionel Brunie, Jean-Marc Pierson, Elisa Bertino Mar 2008

Elimination Of Subjectivity From Trust Recommendation, Omas Hasan, Lionel Brunie, Jean-Marc Pierson, Elisa Bertino

Department of Computer Science Technical Reports

No abstract provided.

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Software Assurance Best Practices For Air Force Weapon And Information Technology Systems - Are We Bleeding?, Ryan A. Maxon Mar 2008

Software Assurance Best Practices For Air Force Weapon And Information Technology Systems - Are We Bleeding?, Ryan A. Maxon

Theses and Dissertations

In the corporate world, "bits mean money," and as the Department of Defense (DoD) becomes more and more reliant on net-centric warfare, bits mean national security. Software security threats are very real, as demonstrated by the constant barrage of Internet viruses, worms, Trojans, and hackers seeking to exploit the latest vulnerability. Most organizations focus their resources on reactive defenses such as firewalls, antivirus software, and encryption, however as demonstrated by the numerous attacks that are successful, those post facto measures are not enough to stop the bleeding. The DoD defines software assurance (SwA) as the "level of confidence that software …

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Analysis Of Canonical Chinese Antonym Co-Occurrence, Eric K. Ringger, Guohui Liu, Shiping Liu, Xingfu Wang Mar 2008

Analysis Of Canonical Chinese Antonym Co-Occurrence, Eric K. Ringger, Guohui Liu, Shiping Liu, Xingfu Wang

Faculty Publications

PDF of Powerpoint Presentation on canonical Chinese antonym co-occurrence. This presentation was given at the Conference of the American Association for Corpus Linguistics in 2008.

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Compiling And Annotating A Syriac Corpus, George Busby, James Carroll, Marc Carmen, Carl Griffin, Robbie Haertel, Kristian Heal, Joshua Heaton, Deryle W. Lonsdale, Peter Mcclanahan, Eric K. Ringger, Kevin Seppi, David Taylor Mar 2008

Compiling And Annotating A Syriac Corpus, George Busby, James Carroll, Marc Carmen, Carl Griffin, Robbie Haertel, Kristian Heal, Joshua Heaton, Deryle W. Lonsdale, Peter Mcclanahan, Eric K. Ringger, Kevin Seppi, David Taylor

Faculty Publications

PDF of Powerpoint Presentation on compiling and annotating a Syriac corpus. This presentation was given at the Conference of the American Association for Corpus Linguistics in 2008.

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Accelerating Corpus Annotation Through Active Learning, George Busby, Marc Carmen, James Carroll, Robbie Haertel, Deryle W. Lonsdale, Peter Mcclanahan, Eric K. Ringger, Kevin Seppi Mar 2008

Accelerating Corpus Annotation Through Active Learning, George Busby, Marc Carmen, James Carroll, Robbie Haertel, Deryle W. Lonsdale, Peter Mcclanahan, Eric K. Ringger, Kevin Seppi

Faculty Publications

PDF of Powerpoint Presentation on accelerating corpus annotation through active learning. This presentation was given at the Conference of the American Association for Corpus Linguistics in 2008.

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Approximations With Improving Error Bounds For Makespan Minimization In Batch Manufacturing, Whitney Samuel Weyerman Mar 2008

Approximations With Improving Error Bounds For Makespan Minimization In Batch Manufacturing, Whitney Samuel Weyerman

Theses and Dissertations

Multipurpose batch manufacturing systems allow a suite of job types to be processed with a fixed set of machines. These types of systems are commonly found in chemical processing, as well as in computer systems and the service industry. In this thesis we consider the problem of sequencing jobs entering the manufacturing system in order to minimize makespan, or total time to complete processing of the jobs. We formulate this problem as a dynamic programming problem and illustrate the computational difficulty of solving this problem. We give a method for simulation of the system by representing each machine in the …

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Validating Digital Evidence For Legal Argument, Richard Boddington, Valerie Hobbs, Graham Mann Mar 2008

Validating Digital Evidence For Legal Argument, Richard Boddington, Valerie Hobbs, Graham Mann

Australian Digital Forensics Conference

Digital evidence is now common in legal cases, but the understanding of the legal fraternity as to how far conventional ideas of evidence can be extended into the digital domain lags behind. Evidence determines the truth of an issue but its weight is subject to examination and verification through existing forms of legal argument. There is a need for a practical ‘roadmap’ that can guide the legal practitioner in identifying digital evidence relevant to support a case and in assessing its weight. A vital, but sometimes under estimated stage is that of validating the evidence before evaluating its weight. In …

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Industrial Espionage From Residual Data: Risks And Countermeasures, Iain Sutherland Mar 2008

Industrial Espionage From Residual Data: Risks And Countermeasures, Iain Sutherland

Australian Digital Forensics Conference

This paper outlines the possible recovery of potentially sensitive corporate information from residual data. It outlines previous work on the recovery of information contained on second hand hard disks and handheld devices and discusses the risk of individuals conducting industrial espionage by targeting specific organizations. It examines the possible avenues for an attacker to obtain a storage device, then discusses the skill level required to extract information from the storage devices and considers the potential risk to an organization from this particular avenue of attack. The paper concludes by proposing a number of possible countermeasures to enable organizations to reduce …

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Forensic Acquisition And Analysis Of The Tomtom One Satellite Navigation Unit, Peter Hannay Mar 2008

Forensic Acquisition And Analysis Of The Tomtom One Satellite Navigation Unit, Peter Hannay

Australian Digital Forensics Conference

Global Positioning Systems are becoming increasingly pervasive. The forensic acquisition and analysis of these units is of great interest as it has the potential to yield historic locational data for these units. Analysis of the TomTom one satellite navigation unit has resulted in a method to reliably extract historic data from these devices in a forensically sound manner.

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Issues Common To Australian Critical Infrastructure Providers Scada Networks Discovered Through Computer And Network Vulnerability Analysis, Craig Valli Mar 2008

Issues Common To Australian Critical Infrastructure Providers Scada Networks Discovered Through Computer And Network Vulnerability Analysis, Craig Valli

Australian Digital Forensics Conference

This paper reports on generic issues discovered as a result of conducting computer and network vulnerability assessments (CNVA) on Australian critical infrastructure providers. Generic issues discovered included policy, governance, IT specific such as segregation, patching and updating. Physical security was also lacking in some cases. Another issue was that previous security audits had failed to identify any of these issues. Of major concern is that despite education and awareness programs, and a body of knowledge referring to these issues, they are still occurring. It may be necessary for the federal government to force organisations to undergo computer and network vulnerability …

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Extending Web Application Development To The User-Editable Space, Brian S. Goodrich Mar 2008

Extending Web Application Development To The User-Editable Space, Brian S. Goodrich

Theses and Dissertations

The growth of the web increased dramatically when users were provided with applications that let them use just their browser to post and edit content on the World Wide Web. Offering users the ability to use their browser to create their own web applications, instead of just posting text and images, would cause another Internet evolution. This thesis describes the EXPPO system (Extensible Page Productions and Operations), a web application development environment for both end-users and technical-users. EXPPO leverages the end-user's previous experience with internet browsers by using a page based development experience or a Page Oriented Architecture. Because applications …

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Trouble In Florida: The Genesis Of Phishing Attacks On Australian Banks, Stephen Mccombie Mar 2008

Trouble In Florida: The Genesis Of Phishing Attacks On Australian Banks, Stephen Mccombie

Australian Digital Forensics Conference

Today Phishing of Internet banks is a well know problem and globally is responsible for more than US$3 billion in fraud annually. To date there has been limited research into the individuals and groups responsible for these attacks. Considerable anecdotal evidence exists to suggest that transnational organised crime groups are involved in Phishing. The involvement of these groups, particularly those operating out of Eastern Europe, is of concern given their sophistication and resources. Earlier work by CRL@mq looked at a month of Phishing against one Australian financial institution and clustering indicative of a small number of groups being responsible was …

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Survey And Future Trends Of Efficient Cryptographic Function Implementations On Gpgpus, Adrian Boeing Mar 2008

Survey And Future Trends Of Efficient Cryptographic Function Implementations On Gpgpus, Adrian Boeing

Australian Digital Forensics Conference

Many standard cryptographic functions are designed to benefit from hardware specific implementations. As a result, there have been a large number of highly efficient ASIC and FPGA hardware based implementations of standard cryptographic functions. Previously, hardware accelerated devices were only available to a limited set of users. General Purpose Graphic Processing Units (GPGPUs) have become a standard consumer item and have demonstrated orders of magnitude performance improvements for general purpose computation, including cryptographic functions. This paper reviews the current and future trends in GPU technology, and examines its potential impact on current cryptographic practices.

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Preventing The Acquisition Of Data From Virtual Machine Based Secure Portableexecution Environments, Peter James Mar 2008

Preventing The Acquisition Of Data From Virtual Machine Based Secure Portableexecution Environments, Peter James

Australian Digital Forensics Conference

A Virtual Machine (VM) based secure Portable Execution Environment (PEE) provides a safe and secure environment that can be loaded into a host PC and an application executed with a degree of confidence that the application is separated, protected and little or no forensic evidence remains after the application has executed. A VM based secure PEE is characterised as a USB storage device containing a VM with a trusted guest operating system and application(s) which is stored in a protected partition, strong authentication to only allow an authorised user to load the VM into the host PC, and full storage …

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Extraction Of User Activity Through Comparison Of Windows Restore Points, Damir Kahvedžić, Tahar Kechadi Mar 2008

Extraction Of User Activity Through Comparison Of Windows Restore Points, Damir Kahvedžić, Tahar Kechadi

Australian Digital Forensics Conference

The extraction of past user activity is one of the main goals in the analysis of digital evidence. In this paper we present a methodology for extracting this activity by comparing multiple Restore Points found in the Windows XP operating system. We concentrate on comparing the copies of the registry hives found within these points. The registry copies represent a snapshot in time of the state of the system. Differences between them can reveal user activity from one instant to another. This approach is implemented and presented as a tool that is able to compare any set of offline hive …

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Email 'Message-Ids' Helpful For Forensic Analysis?, Satheesaan Pasupatheeswaran Mar 2008

Email 'Message-Ids' Helpful For Forensic Analysis?, Satheesaan Pasupatheeswaran

Australian Digital Forensics Conference

Finding the source of spoofed email is a challenging task for forensic investigators. Header of an email has several fields that can be used for investigation. An investigator can easily understand the evidences embedded within most of the header fields of an email, except the message-id field. Therefore, there is a need to understand how message-ids are constructed and what useful information can be recovered from them. The immediate aim of the analysis is to find the message-id construction mechanism of ‘Sendmail’ mail transfer agent (MTA) version 8.14 and how the findings can be used successfully in forensic analysis. Source …

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Data Hiding In Windows Executable Files, Daemin Shin, Yeog Kim, Keunduck Byun, Sangjin Lee Mar 2008

Data Hiding In Windows Executable Files, Daemin Shin, Yeog Kim, Keunduck Byun, Sangjin Lee

Australian Digital Forensics Conference

A common technique for hiding information in executable files is the embedding a limited amount of information in program binaries. The hiding technique is commonly achieved by using special software tools as e.g. the tools presented by Hydan and Stilo in (Rakan, 2004, Bertrand, 2005). These tools can be used to commit crimes as e.g. industrial spy activities or other forms of illegal data access. In this paper, we propose new methods for hiding information in Portable Executable (PE) files. PE is a file format for executables used in the 32-bit and 64-bit versions of the Windows operating system. In …

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Subverting National Internet Censorship - An Investigation Into Existing Tools And Techniques, Jason Smart, Kyle Tedeschi, Daniel Meakins, Peter Hannay, Christopher Bolan Mar 2008

Subverting National Internet Censorship - An Investigation Into Existing Tools And Techniques, Jason Smart, Kyle Tedeschi, Daniel Meakins, Peter Hannay, Christopher Bolan

Australian Digital Forensics Conference

The announcement of a trial of a National level internet filter in Australia has caused renewed interest in the arena of internet censorship. Whilst details on the schemes being tested have been fairly sparse the announcement of the trial itself, has drawn wide condemnation from privacy advocates throughout the world. Given this announcement it was decided to test and compare three of the most popular free tools available that allow for the bypassing of internet censorship devices such as those used within China. Tests were conducted using three software packages, Freegate, GPass and GTunnel which were analysed through packet capture …

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Malware, Viruses And Log Visualisation, Iain Swanson Mar 2008

Malware, Viruses And Log Visualisation, Iain Swanson

Australian Digital Forensics Conference

This paper will look at the current state of visualization in relation to mainly malware collector logs, network logs and the possibility of visualizing their payloads. We will show that this type of visualization of activity on the network can help us in the forensic investigation of the traffic, which may contain unwanted pieces of cod, and may identify any patterns within the traffic or payloads that might help us determine the nature of the traffic visually. We will further speculate on a framework that could be built which would be able to finger print any type of malware, based …

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Virtual Environments Support Insider Security Violations, Iain Swanson, Patricia A.H. Williams Mar 2008

Virtual Environments Support Insider Security Violations, Iain Swanson, Patricia A.H. Williams

Australian Digital Forensics Conference

This paper describes an investigation into how an employee using a virtual environment can circumvent any or all of the security, policies and procedures within an organization. The paper discusses the fundamental issues that organizations must address to be able to detect such an attack. Attacks of this nature may be malicious with intent to cause disruption by flooding the network or disabling specific equipment, or non-malicious by quietly gathering critical information such as user names and passwords or a colleague’s internet banking details. Identification of potential residual evidence following an attack is presented. Such evidence may be used to …

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Malware Detection And Removal: An Examination Of Personal Anti-Virus Software, Patryk Szewczyk, Murray Brand Mar 2008

Malware Detection And Removal: An Examination Of Personal Anti-Virus Software, Patryk Szewczyk, Murray Brand

Australian Digital Forensics Conference

SoHo users are increasingly faced with the dilemma of applying appropriate security mechanisms to their computer with little or no knowledge of which countermeasure will deal with which potential threat. As problematic as it may seem for individuals to apply appropriate safeguards, individuals with malicious intent are advancing methods by which malicious software may operate undetected on a target host. Previous research has identified that there are numerous ways in which malware may go undetected on a target workstation. This paper examines the quality of malware removal programs currently available on the market, which consumers may use whilst utilising the …

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The 2008 Australian Study Of Remnant Data Contained On 2nd Hand Hard Disks: The Saga Continues, Craig Valli, Andrew Woodward Mar 2008

The 2008 Australian Study Of Remnant Data Contained On 2nd Hand Hard Disks: The Saga Continues, Craig Valli, Andrew Woodward

Australian Digital Forensics Conference

This study looked for remnant data on enterprise level hard drives that were purchased through auctions. The drives were analysed for information, be it topical or formatted. In the event that drives were formatted, forensic tools were used to recover this data. This years study revealed a high level of not simply un-erased drives, but drives which contained information that related to critical infrastructure providers. That such a small sample size yielded such a high rate of un-erased drives is of considerable concern, and it may be necessary for the government to become involved.

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Data Recovery From Palmmsgv001, Satheesaan Pasupatheeswaran Mar 2008

Data Recovery From Palmmsgv001, Satheesaan Pasupatheeswaran

Australian Digital Forensics Conference

Both SMS and MMS data analysis is an important factor in mobile forensic analysis. Author did not find any mobile forensic tool that is capable of extracting short messages (SMS) and multimedia messages (MMS) from Palm Treo 750. SMS file of Palm Treo 750 is called PalmMgeV001 and it is a proprietary file system. A research work done to find a method to recover SMS data from PalmMsgV001 file. This paper is going to describe the research work and its findings. This paper also discusses a methodology that will help recover SMS data from PalmMsgV001. The PalmMsgV001 file is analysed …

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Digital Forensics And The Legal System: A Dilemma Of Our Times, James Tetteh Ami-Narh, Patricia A.H. Williams Mar 2008

Digital Forensics And The Legal System: A Dilemma Of Our Times, James Tetteh Ami-Narh, Patricia A.H. Williams

Australian Digital Forensics Conference

Computers have become an important part of our lives and are becoming fundamental to activities in the home and workplace. Individuals use computer technology to send emails, access banking information, pay taxes, purchase products, surf the internet and so on. Business also use computers and the Internet to perform accounting tasks, manage customer information, store trade secrets, and develop new products and services. State, Federal and Local government agencies use the computer and Internet to create and access information. Similarly, digital systems have become the mainstay of criminal activity. Legal proceedings have always been influenced by tradition and court decisions. …

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The Malware Analysis Body Of Knowledge (Mabok), Craig Valli Mar 2008

The Malware Analysis Body Of Knowledge (Mabok), Craig Valli

Australian Digital Forensics Conference

The ability to forensically analyse malicious software (malware) is becoming an increasingly important discipline in the field of Digital Forensics. This is because malware is becoming stealthier, targeted, profit driven, managed by criminal organizations, harder to detect and much harder to analyse. Malware analysis requires a considerable skill set to delve deep into malware internals when it is designed specifically to detect and hinder such attempts. This paper presents a foundation for a Malware Analysis Body of Knowledge (MABOK) that is required to successfully forensically analyse malware. This body of knowledge has been the result of several years of research …

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Cpg: Closed Pseudonymous Groups, Reed S. Abbott Mar 2008

Cpg: Closed Pseudonymous Groups, Reed S. Abbott

Theses and Dissertations

Internet users generally feel their actions are anonymous, but this is often not the case. Users can be tracked and their actions logged for future analysis, which is not the desire of most users. Software and services exist which offer anonymity on the Internet when used correctly. Anonymity on the Internet is useful for many people including whistleblowers, dissidents, law enforcement, and the security conscious, but it can be abused. A user can act maliciously under the guise of anonymity without the fear of retribution. Thus, a level of administrative control over users is desirable, even in an anonymous system. …

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An Examination Into How Group Performance Is Influenced By Various Communication Channels, Jason C. Norgaard Mar 2008

An Examination Into How Group Performance Is Influenced By Various Communication Channels, Jason C. Norgaard

Theses and Dissertations

This purpose of this research was to look at the how group performance is influenced by various communication channels. Specifically, this research sought to determine what communication factors are affected when groups are forced to use different communications channels. The three communications channels tested were face-to-face communications, audio conferencing, and computer-mediated communications through an Internet chat program. Each channel was measured on accuracy, efficiency, and total number of ideas generated. The research found that the groups using computer-mediated communications had a difficult time completing the exercises in the allotted time. Additionally, the computer-mediated produced significantly fewer total words and total …

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Putting The Web Services Specifications To Rest, Dan R. Olsen Mar 2008

Putting The Web Services Specifications To Rest, Dan R. Olsen

Theses and Dissertations

Web services have become a useful and effective way of sharing information over the World Wide Web. SOAP has become a popular way of providing Web services and has been the focus of the Web Services specifications. The Web Services specifications provide additional capabilities to Web Services such as security and policy exchange. Another popular form of Web services includes light-weight Web or RESTful Web services over HTTP. These light-weight Web services are currently not addressed by the Web Services specifications. In order to provide the same capabilities to RESTful Web services, the Web Services specifications will be used to …

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Composable Distributed Access Control And Integrity Policies For Query-Based Wireless Sensor Networks, David W. Marsh Mar 2008

Composable Distributed Access Control And Integrity Policies For Query-Based Wireless Sensor Networks, David W. Marsh

Theses and Dissertations

An expected requirement of wireless sensor networks (WSN) is the support of a vast number of users while permitting limited access privileges. While WSN nodes have severe resource constraints, WSNs will need to restrict access to data, enforcing security policies to protect data within WSNs. To date, WSN security has largely been based on encryption and authentication schemes. WSN Authorization Specification Language (WASL) is specified and implemented using tools coded in JavaTM. WASL is a mechanism{independent policy language that can specify arbitrary, composable security policies. The construction, hybridization, and composition of well{known security models is demonstrated and shown to preserve …

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