Category: Publications

Khaled Baqer, Danny Yuxing Huang, Damon McCoy, and Nicholas Weaver In this paper, we present an empirical study of a recent spam campaign (a “stress test”) that resulted in a DoS attack on Bitcoin. The goal of our investigation being to understand the methods spammers used and impact on Bitcoin users.

Rui Zhang and  Quanyan Zhu Machine learning algorithms, such as support vector machines (SVMs), neutral networks, and decision trees (DTs) have been widely used in data processing for estimation and detection. They can be used to classify samples based on a model built from training data. However, under the assumption that training and testing samples...

Carol J. Fung and Quanyan Zhu Computer systems evolve to be more complex and vulnerable. Cyber attacks have also grown to be more sophisticated and harder to detect. Intrusion detection is the process of monitoring and identifying unauthorized system access or manipulation. It becomes increasingly difficult for a single intrusion detection system (IDS) to detect all...

Ozgur Sinanoglu and Ramesh Karri There is a growing concern regarding the trustworthiness and reliability of the hardware underlying all information systems on which modern society is reliant. Trustworthy and reliable semiconductor supply chain, hardware components, and platforms are essential to all critical infrastructures including financial, healthcare, transportation, and energy.

Vinayaka Jyothi, Manasa Thoonoli, Richard Stern and Ramesh Karri This paper proposes a novel methodology FPGA Trust Zone (FTZ) to incorporate security into the design cycle to detect and isolate anomalies such as Hardware Trojans in the FPGA fabric. Anomalies are identified using violation to spatial correlation of process variation in FPGA fabric.

Kan Xiao, Domenic Forte, Yier Jin, Ramesh Karri, Swarup Bhunia, and Mark Mohammad Tehranipoor  Given the increasing complexity of modern electronics and the cost of fabrication, entities from around the globe have become more heavily involved in all phases of the electronics supply chain. In this environment, hardware Trojans (i.e., malicious modifications or inclusions made by untrusted third parties)...

Jack Tang, Ramesh Karri, Mohamed Ibrahim, and Krishnendu Chakrabarty Much progress has been made in digital microfluidic biochips (DMFB), with a great body of literature addressing low-cost, high-performance, and reliable operation. Despite this progress, security of DMFBs has not been adequately addressed. We present an analysis of a DMFB system prone to malicious modification of routes...

Minhui Xue, Cameron Ballard, Kelvin Liu, Carson Nemelka, Yanqiu Wu, Keith Ross, and Haifeng Qian The recent growth of anonymous social network services — such as 4chan, Whisper, and Yik Yak — has brought online anonymity into the spotlight. For these services to function properly, the integrity of user anonymity must be preserved. If an...