Yong Guan

Associate Professor

 

Department of Electrical and Computer Engineering

Iowa State University, Ames, IA 50011.

Office: 3216 Coover Hall
Phone: (515) 294-8378  Fax: (515) 294-8432

E-mail: yguan (at) iastate.edu

The ARO Workshop on Digital Forensics has been held in Arlington, Virginia, USA on September 10-11, 2009. The workshop focused on challenges, approaches, and research roadmaps in the area of digital forensics. We had two keynote speakers -  Steven D. Shirley (Director of the DoD Cyber Crime Center) and Thomas G. Motta (Section Chief of Digital Evidence, FBI) and 75 attendees from DHS, DoD, DOE, FBI, NIJ, NIST, NSA, academia, and industry. The workshop report will be released soon. Thanks to all who have contributed and actively participated in the workshop!

Also, Digital Forensics Working Group, initiated at the 2009 NSA/DHS CAE Principals Meeting, aims at defining and standardizing the educational efforts in digital forensics at various levels. Several activities are being planned. Please feel free to send your suggestions and comments to Dr. Roy Campbell and me.

  

 

 

 

Research Interests

Computer networks and distributed systems, with focuses on security issues, including computer and network forensics, wireless and sensor network security, privacy-enhancing technologies for the Internet, and secure real-time computing and communication.

Research Background

I am an Associate Professor in Electrical and Computer Engineering at Iowa State University and am affiliated with the Iowa State University's NSA-designated Information Assurance Center. Meanwhile, I am an Ames Lab associate for Midwest Forensics Resource Center at U.S. DoE's Ames Lab. I won the National Science Foundation CAREER Award and was honored as the Litton Chair Assistant Professor in 2007. Our recent research work have been featured in Science Daily, Technology News Daily, NSF News, NASA Tech Briefs, and Channel 13 News (Who-TV).

 

I received a Ph.D. degree (2002) in Computer Science from Texas A&M University under the advisement of Dr. Wei Zhao, M.S. degree in Computer Science (advised by Prof. Baojue Chen) and B.S. degree in Computer Science (advised by Profs. Shiwei Tang and Dongqing Yang) from Peking University.

Teaching

CprE 536: Computer and Network Forensics, (2002F, 2003F, 2004F, 2005F, 2006F, 2007F, 2008F, 2009F)

CprE 450/550: Distributed Systems and Middleware, (2003S, 2004S, 2005S, 2006S, 2007S, 2008S, 2009S, 2010S)

CprE 308: Operating Systems, (2007F, 2008F, 2010S)

Research Projects

Advanced Attack Attribution

Cyber Forensics

Secure Network Coding

Online Frauds

Wireless Security

Research Projects while I was in Texas A&M University:

NetCamo: NetCamo (stands for Network Camouflaging) aims to prevent traffic analysis in mission-critical QoS-guaranteed networks. Funded by DARPA ITO Fault Tolerant Networks program.

NetEx: NetEx (stands for Network Express) enables user applications to participate in delay guaranteed communications. Funded by DARPA ITO Quorum program.

Selected Research Support

National Science Foundation, "CAREER: Practical Scheme Design for Supporting Secure and Resilient Resource-constrained Wireless Networks", Yong Guan (PI), 01/2007-12/2011.

National Science Foundation, "Secure Network Coding and Cooperative Relaying", Yong Guan (PI), Ahmed Kamal and Sang Kim, 10/2006-9/2010.

Intelligence Advanced Research Projects Activity (IARPA) (formerly, Disruptive Technology Office (DTO) / Advanced Research and Development Activity (ARDA)), "Advanced Attack Attribution", Yong Guan (PI), Julie Dickerson and Tom Daniels, 10/2003-8/2007.

National Science Foundation, "Cyberspace Forensics: Research, Course Development, and Laboratory Development", Yong Guan (PI), Jim Davis and Doug Jacobson, 7/2003-8/2007.

Carver Trust Foundation, "Adaptive Reputation-based Access Control and Resource Scheduling for Distributed Computing Systems", Yong Guan (PI), 4/2003-7/2004.

Honors and Awards

Outstanding Community Service Award, IEEE Technical Committee on Security and Privacy, May 2008. (for the joint work with Patrick McDaniel, Avi Rubin, David Du, David Shambroom, and Deborah Shands in organizing the 2008 Oakland Conference. We had 3 award papers and a record high number (292) of attendees.)

The Litton Industries Professorship, 2007.

Iowa State University Award for Early Achievement in Research, 2007. (One at ISU per year. Photo with Iowa State President Gregory Geoffroy at ISU 2007 Fall Convocation)

NSF Career Award, 2007.

Second Place Graduate Winner, 10th ACM International Student Research Contest,  Northern Kentucky/Cincinnati, OH, March 1, 2002. See the photo of the top 3 winners.

Best Student Paper Award, IEEE National Aerospace and Electronics Conference, Dayton, OH, 1998.

Professional Activities and Services

Member of IFIP TC-11 WG 11.9: Digital Forensics.

Cipher Associate Editor, IEEE Computer Society's Technical Committee on Security and Privacy.

Associate Editor, IEEE Transactions on Information Forensics and Security, 2009 - present.

Editorial Board Member, International Journal of Security and Networks (IJSN), 2008 - present.

Security and Privacy Chair Emeritus, IEEE Computer Society's Technical Committee on Security and Privacy, 2008-2009.

General Chair, 29th IEEE Symposium on Security and Privacy (SP 2008, a.k.a., the Oakland Conference), Berkeley, California, May 18-22, 2008.

Co-coordinator (with Dr. Roy Campbell), Digital Forensics Working Group, NSA/DHS CAE Principals Meeting, November 9-10, 2009.

Co-organizer (with Dr. Cliff Wang), ARO Workshop on Digital Forensics, Arlington, VA, USA, September 10-11, 2009.

Program Vice Chair for the area of Security and Trustworthy Computing, 15th IEEE International Conference on Parallel and Distributed Systems (ICPADS 2009), December 9-11, 2009.

Program co-Vice Chair for the area of Security and Privacy, 28th IEEE International Conference on Distributed Computing Systems (ICDCS 2008), Beijing, China, June 17-20, 2008.

Publicity and Registration Chair, 28th IEEE Symposium on Security and Privacy (SP 2007), Berkeley, California, May 20-23, 2007.

Program Committee Member, IEEE Globecom 2010, Communication & Information System Security Symposium, Miami, Florida, USA, December 6-10, 2010.

Program Committee Member, 10th Annual Digital Forensic Research Conference (DFRWS 2010), Portland, Oregon, USA, August 2-4, 2010.

Program Committee Member, 30th IEEE International Conference on Distributed Computing Systems (ICDCS 2010), Genova (Genoa), Italy, June 21-25, 2010.

Program Committee Member, IEEE International Conference on Communications (ICC 2010), Communication and Information System Security Symposium, Cape Town, South Africa, May 23-27, 2010.

Program Committee Member, 5th IEEE International Workshop on Systematic Approaches to Digital Forensic Engineering (SADFE 2010), Held in conjunction with the IEEE Symposium on Security and Privacy (Oakland 2010), The Claremont Resort, Oakland, CA, USA, May 20, 2010.

Program Committee Member, 4th Workshop on Information Security Theory and Practice (WISTP 2010), Passau, Germany, April 12-14, 2010.

Program Committee Member, 25th Annual ACM Symposium on Applied Computing (SAC 2010), Computer Forensics Track, Sierre, Switzerland, March 22 – 26, 2010.

Program Committee Member, IEEE INFOCOM 2010, San Diego, CA, USA, March 15-19, 2010.

Program Committee Member, 11th International Conference on Information and Communications Security (ICICS 2009), Beijing, China, December 14-17, 2009.

Program committee member, 5th IEEE International Conference on Security and Privacy in Communication Networks (SecureComm 2009), Athens, Greece, September 14-18, 2009.

Program Committee member, 12th Information Security Conference (ISC 2009), Pisa, Italy, September 7-9, 2009.

Program Committee Member, 9th Annual Digital Forensic Research Workshop (DFRWS 2009), Montreal, Canada, August 17-19, 2009.

Program Committee Member, 29th IEEE International Conference on Distributed Computing Systems (ICDCS 2009), Montreal, Canada, June 22-26, 2009.

Program Committee Member, IEEE INFOCOM 2009, Rio de Janeiro, Brazil, April 19-25, 2009.

Program Committee Member, 24th Annual ACM Symposium on Applied Computing (SAC 2009), Computer Forensics Track, Honolulu, Hawaii, USA, March 8-12, 2009.

Program Committee Member, 4th IEEE International Conference on Security and Privacy in Communication Networks (SecureComm 2008), Istanbul, Turkey, September 22-25, 2008.

Program Committee Member, 23rd IFIP International Information Security Conference (SEC 2008), Milan, Italy, September 8 - 10, 2008.

Program Committee member, 5th IEEE International Conference on Broadband Communications, Networks, and Systems (BROADNETS 2008), London, UK, September 8-11, 2008.

Program Committee Member, 8th Annual Digital Forensic Research Workshop (DFRWS 2008), Baltimore, Maryland, USA, August 11-13, 2008.

Program Committee Member, 3rd IEEE International Workshop on Systematic Approaches to Digital Forensic Engineering (SADFE 2008), held in conjunction with the 2008 IEEE Symposium on Security and Privacy (SP 2008), Oakland, California, USA, May 22, 2008.

Program Committee Member, IEEE INFOCOM 2008, Phoenix, Arizona, USA, April 13-19, 2008.

Program Committee Member, 14th ACM Computer and Communication Security (CCS 2007), Industry Track, Alexandria, VA, October 29 - November 2, 2007.

Program Committee Member, IEEE INFOCOM 2007, Anchorage, Alaska, USA, May 6-12, 2007.

Program Committee Member, 50th annual IEEE Global Telecommunications Conference (GLOBECOM 2007), General Symposium, Washington, D.C., November 26-30, 2007.

Program Committee Member, 2nd Computer Network Forensics Research Workshop (CNFR 2007), held in conjunction with the 3rd International Conference on Security and Privacy in Communication Networks (SecureComm 2007), Nice, France, September 17-21, 2007.

Program Committee Member, 7th Annual Digital Forensic Research Workshop (DFRWS 2007), Pittsburgh, Pennsylvania, USA, August 13-15, 2007.

Symposium co-Chair, Computer and Network Security Symposium, International Wireless Communications & Mobile Computing Conference (IWCMC 2007), Turtle Bay Resort, Honolulu, Hawaii, August 12-16, 2007.

Program committee member, 1st IEEE International Workshop on Security in Software Engineering (IWSSE 2007), held in conjunction with 31st Annual IEEE International Computer Software and Applications Conference (COMPSAC 2007), Beijing, China, July 24-27, 2007.

Submission Chair and Program Committee Member, 2nd International Workshop on Systematic Approaches to Digital Forensic Engineering (SADFE 2007), Seattle, Washington, April 10-13, 2007.

Program Committee Member, 22nd Annual ACM Symposium on Applied Computing (SAC 2007), Computer Forensics Track, Seoul, Korea, March 11-15, 2007.

Posters and Demos Chair and Program Committee Member, 8th International Conference on Information and Communications Security (ICICS 2006), Raleigh, North Carolina, USA, December 4-7, 2006.

Program co-Chair, 2nd IEEE International Workshop on Wireless and Sensor Networks Security (WSNS 2006), held in conjunction with the 3rd IEEE International Conference on Mobile Ad-hoc and Sensor Systems (MASS 2006), Vancouver, Canada, October 9-12, 2006.

Program Committee Member, 6th Annual Digital Forensic Research Workshop (DFRWS 2006), Lafayette, Indiana, USA, August 14-16, 2006.

Program Committee Member, 3rd ACM Workshop on Security of Ad-Hoc and Sensor Networks (SASN 2005), held in conjunction with the 12th ACM Conference on Computer and Communications Security (CCS 2005), Alexandria, Virginia, USA, November 7-11, 2005.

Program Committee Member, 1st International Workshop on Systematic Approaches to Digital Forensic Engineering (SADFE 2005), Taipei, Taiwan, November 7-10, 2005.

Program co-Chair, Computer Network Forensics Research Workshop (CNFR 2005), held in conjunction with the 1st International Conference on Security and Privacy for Emerging Areas in Communication Networks (SecureComm 2005), Athens, Greece, September 5-9, 2005.

Program Chair, 2nd International Workshop on Security in Distributed Computing Systems (SDCS-2005), held in conjunction with the 25th International Conference on Distributed Computing Systems (ICDCS 2005), Columbus, Ohio, USA, June 6-10, 2005.

Students

Current Students: Wenji Chen, Bryan Ellingson, Ben Kallal, Bibudh Lahiri, Yang Liu, Teja Myneedu, Yanlin Peng, Ramzi Saifan, Yawen Wei, Gang Xu

Former Students:

Zhen Yu, Ph.D., September 2003 - May 2009, Dissertation: "Practical Security Scheme Design for Resource-constrained Wireless Networks", degree granted May 2009. Received ISU Graduate Student Research Excellence Award. Now at Ericsson, Boulder, Colorado.

Linfeng Zhang, Ph.D., January 2004 - December 2008, Dissertation: "Techniques for Monitoring and Attributing Complicated Attacks in Real-world Networks", degree granted December 2008. Received ISU Graduate Student Research Excellence Award. Now a Senior Algorithm Engineer at Vidyo, Inc. Hackensack, New Jersey.

Oliverio Covarrubias, MS, September 2008 - December 2009, Creative Component: "A Cursor Movement-based Embedded Tag Tracking Method for Online Click Fraud Detection", granted December 2009, now at Rockwell Collins.

Chunwang Gao, MS, (Steven Russell, co-advisor),September 2006 - December 2009, Thesis: "A Statistical Indoor Localization Method for Supporting Location-based Access Control", granted December 2009, now at Virginia Commonwealth University.

Mike Blasi, MS, January 2008 - August 2009, Thesis: "Techniques for detecting zero day phishing websites", granted August 2009, now at Ames Engineering.

Lars Kulseng, MS, September 2007 - May 2009, Thesis: "Lightweight Mutual Authentication, Ownership Transfer and Secure Search for Low-cost RFID Systems", granted May 2009, now at Wireless Trondheim, Trondheim, Norway.

Bhuvaneswari Ramkumar, MS, September 2006 - August 2008, Thesis: "Encrypted Malware Detection", granted August 2008, now at Cisco.

Paul Miller, MS, (Johnny Wong, co-advisor), September 2007 - May 2008, Thesis: "Visualization for Network Forensic Analyses: Extending the Forensic Log Investigator (FLI)", granted May 2008, now at FBI.

Thieu Pham, MS, September 2005 - December 2007, Thesis: "Forensic Log Investigator (FLI) - A Log Analysis and Visualization Tool", granted December 2007, now at Cisco.

Anthony Persaud, MS, September 2004 - May 2006, Thesis: "The Use of Wavelet Watermarking and Statistical Classification Techniques for Collusion Detection and Identification in Multimedia Forensics", granted May 2006, now a PhD student at Carnegie Mellon University.

Douglas Houghton, MS, (Doug Jacobson, co-advisor), September 2004 - December 2005, Thesis: "Design and Development of Network Traffic Simulator", granted December 2005, now at Mitre.

William Sears, MS, (Tom Daniels, co-advisor), May 2003 - August 2005, Thesis: "PeerCredential: A Support Reputation-based Trust Framework for Peer-to-Peer Applications", granted Augutst 2005, now at U.S. DoE's Ames Lab.

Wale Martins, MS, (Tom Daniels, co-advisor), September 2003 - August 2005, Thesis: "Affecting IP Traceback with Recent Internet Topology Maps", granted August 2005, now at Microsoft.

Joel Cardo, BS, Undergraduate RA, September 2003 - December 2004, Lightweight Statistical Authentication Protocol for Access Control in Wireless LANs, now at Rockwell Collins.

Alan Johnson, BS, Undergraduate RA, Stepping Stone Attack Attribution, September 2003 - May 2006, now a PhD student at Princeton University.

Selected Recent Publications

Yawen Wei, Zhen Yu, and Yong Guan, "Efficient Weakly-Secure Network Coding Schemes against Wiretapping Attacks," in Proceedings of the IEEE International Symposium on Network Coding (NetCod 2010), Toronto, Canada, June 9 — 11, 2010.

Yang Liu, Linfeng Zhang and Yong Guan, "Sketch-based Streaming PCA Algorithm for Network-wide Traffic Anomaly Detection," in Proceedings of the 30th IEEE International Conference on Distributed Computing Systems (ICDCS 2010), Genoa, Italy, June 21-25, 2010.

Lars Kulseng, Zhen Yu, Yawen Wei, and Yong Guan, "Lightweight Mutual Authentication and Ownership Transfer for RFID Systems," in Proceedings of the 30th IEEE International Conference on Computer Communications (INFOCOM 2010), mini-conference, San Diego, CA, USA, March 15-19, 2010.

Yanlin Peng, Linfeng Zhang, Morris Chang, and Yong Guan, "An Effective Method for Combating Malicious Scripts Clickbots," in Proceedings of the 14th European Symposium on Research in Computer Security (ESORICS 2009), Saint Malo, France, September 21-23, 2009.

Yawen Wei, Zhen Yu, and Yong Guan, "A Novel Architecture for Secure and Scalable Multicast over IP Network," in Proceedings of the 5th International ICST Conference on Security and Privacy in Communication Networks (SecureComm 2009), Athens, Greece, September 14-18, 2009.

Lars Kulseng, Zhen Yu, Yawen Wei, and Yong Guan, "Lightweight Secure Search Protocols for Low-cost RFID Systems," in Proceedings of the 29th IEEE International Conference on Distributed Computing Systems (ICDCS 2009), Montreal, Quebec, Canada, June 22-26, 2009.

Zhen Yu, Yawen Wei, Bhuvaneswari Ramkumar, and Yong Guan, "An Efficient Signature Scheme for Securing XOR Network Coding against Pollution Attacks," in Proceedings of the 28th IEEE International Conference on Computer Communications (INFOCOM 2009), Rio de Janeiro, Brazil, April 19-25, 2009.

Yanlin Peng, Linfeng Zhang, and Yong Guan, "Detecting Fraud in Internet Auction Systems," in 5th Annual IFIP WG 11.9 International Conference on Digital Forensics, Orlando, Florida, January 25 - 28, 2009.

Chunwang Gao, Zhen Yu, Yawen Wei, Steve Russell, and Yong Guan, "A Statistical Indoor Localization Method for Supporting Location-based Access Control," ACM/Springer Mobile Networks and Applications (MONET), Vol. 14, Issue 2, pp. 253-263, 2009.

Xinwen Fu, Steve Graham, Shu Jiang, and Yong Guan, "On TCP Performance in Flow Based Anonymous Communication Networks," IEEE Transactions on Parallel and Distributed Systems, to appear.

Linfeng Zhang and Yong Guan, "Detecting Click Fraud in Pay-Per-Click Streams of Online Advertising Networks," in Proceedings of the 28th IEEE International Conference on Distributed Computing Systems (ICDCS 2008), Beijing, China, June 17-20, 2008.

Linfeng Zhang and Yong Guan, "Frequency Estimation over Sliding Windows," in Proceedings of the 24th IEEE International Conference on Data Engineering (ICDE 2008), poster paper, Cancun, Mexico, April 7-12, 2008. 

Yawen Wei, Zhen Yu, and Yong Guan, "Location Verification Algorithms for Wireless Sensor Networks," in Proceedings of the 27th IEEE International Conference on Distributed Computing Systems (ICDCS 2007), Toronto, Canada, June 25-29, 2007.

Linfeng Zhang and Yong Guan, "Variance Estimation over Sliding Windows," in Proceedings of the 26th ACM Symposium on Principles of Database Systems (PODS 2007), Beijing, China, June 11-14, 2007.

Zhen Yu, Yawen Wei, and Yong Guan, "Key Management for Wireless Sensor Networks," Handbook of Wireless Mesh & Sensor Networking, G. Aggelou (ed.), McGraw-Hill International, Accepted in February 2007.

Linfeng Zhang and Yong Guan, "TOPO: A Topology-aware Single Packet Attack Traceback Scheme," in Proceedings of IEEE International Conference on Security and Privacy in Communication Networks (SecureComm 2006), Baltimore, Maryland, USA, August 28-September 1, 2006.

Yawen Wei, Zhen Yu, and Yong Guan, "COTA: A Robust Multi-hop Localization Scheme in Wireless Sensor Networks," in Proceedings of IEEE/ACM International Conference on Distributed Computing in Sensor Systems (DCOSS 2006), San Francisco, California, USA, June 18-20, 2006.

Zhen Yu and Yong Guan, "A Dynamic En-route Scheme for Filtering False Data in Wireless Sensor Networks," in Proceedings of the 25th IEEE International Conference on Computer Communications (INFOCOM 2006), Barcelona, Spain, April 23-27, 2006.

Linfeng Zhang, Anthony Persaud, Alan Johnson, and Yong Guan, "Stepping Stone Attack Attribution in Non-cooperative IP Networks," in Proceedings of the 25th IEEE International Performance Computing and Communications Conference (IPCCC 2006), Phoenix, Arizona, USA, April 10-12, 2006.

Jianqiang Xin, Linfeng Zhang, Brad Aswegan, Julie Dickerson, Tom Daniels, and Yong Guan, "A Testbed for Evaluation and Analysis of Stepping Stone Attack Attribution Techniques," in Proceedings of the 2nd International IEEE/Create-Net Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities (TridentCom 2006), Barcelona, Spain, March 1-3, 2006.

Anthony Persaud and Yong Guan, "Collusion Detection and Identification for Multimedia Forensics," in the second Annual IFIP WG 11.9 International Conference on Digital Forensics, Orlando, Florida, USA, January 29 - February 1, 2006. An extended version in Research Advances in Digital Forensics (Springer).

Haoli Wang, Joel Cardo, and Yong Guan, "Shepherd: A Lightweight Statistical Authentication Protocol for Access Control in Wireless LANs," Elsevier Computer Communications Journal, Special Issue on Applications and Services in Wireless Networks, Vol. 28, No. 14, pp. 1618-1630, September 2005.

William Sears, Zhen Yu, and Yong Guan, "An Adaptive Reputation-based Trust Framework for Peer-to-Peer Applications," in Proceedings of the 4th IEEE International Symposium on Network Computing and Applications (NCA 2005), Boston, Massachusetts, USA, July 27-29, 2005.

Zhen Yu and Yong Guan, "A Key Pre-Distribution Scheme Using Deployment Knowledge for Wireless Sensor Networks," in Proceedings of the 4th ACM/IEEE International Conference on Information Processing in Sensor Networks (IPSN 2005), Los Angeles, California, USA, April 25-27, 2005. An extended version will appear in IEEE Transactions on Parallel and Distributed Systems.

Anthony Persaud and Yong Guan, "A Framework for Email Investigations: Automated Information Extraction and Linkage Discovery," First Annual IFIP WG 11.9 International Conference on Digital Forensics, Orlando, Florida, USA, February 13-16, 2005. An extended version in Research Advances in Digital Forensics (Springer).

Yong Guan, Xinwen Fu, Riccardo Bettati, and Wei Zhao, "A Quantitative Analysis of Anonymous Communications," IEEE Transactions on Reliability, Vol. 53, No. 1, pp. 103-116, March 2004.

Dan Berleant, M.-P. Cheong, Chris Chu, Yong Guan, Ahmed Kamal, Gerald Sheble, S. Ferson, and J.F. Peters, "Dependable Handling of Uncertainty", Reliable Computing, Special Issue on Dependable Reasoning about Uncertainty, Vol. 9, No. 6, pp. 407-418, 2003.

Yong Guan, Xinwen Fu, Riccardo Bettati, and Wei Zhao, "An Optimal Strategy for Anonymous Communication Protocols," in Proceedings of the 22nd IEEE International Conference on Distributed Computing Systems (ICDCS 2002), Vienna, Austria, July 2-5, 2002.

Yong Guan, Xinwen Fu, Dong Xuan, Prashanth Shenoy, Riccardo Bettati, and Wei Zhao, "NetCamo: Camouflaging Network Traffic for QoS-Guaranteed Mission Critical Applications," IEEE Transactions on System, Man, and Cybernetics, Special Issue on Information Assurance, Vol. 31, No. 4, pp. 253-265, July 2001.

Selected Talks

Tutorial, "Digital Forensics: Research Challenges and Open Problems", 13th ACM Conference on Computer and Communication Security (CCS 2006), Alexandria, VA, October 31, 2006.

"Detecting Click Fraud in Pay-Per-Click Streams of Online Advertising Networks", Department of Computer Science, University of Hong Kong, July 31, 2008.

"False Data Filtering", Hong Kong Polytechnic University, July 29, 2008.

"Fraud Detection in the Internet Auction Systems", eBay, San Jose, CA, May 23, 2008.

"Cyber Crime: The Transformation of Crime in the Information Age", ISU Alumni @ Hamilton Co., Webster City, IA, March 30, 2008. (The title was the same as David S. Wall's book) (Photo with ISU Alumni).

"Digital Forensics: Research Challenges and Open Problems", University of Iowa, Iowa City, IA, December 4, 2007.

"Stepping Stone Attack Attribution in Non-Cooperative IP Networks", John Jay College of Criminal Justice, City University of New York, New York, NY, October 17, 2006.

"Practical Security Scheme Design for Sensor Networks", Telcordia Research, Piscataway, NJ, October 16, 2006.

"Open Source/Closed Source Software in Security Education", Invited panelist at the Annual Conference on Education in Information Security, Ames, IA. September 17-18, 2006.

"Key Pre-distribution Scheme Using Deployment Knowledge for Wireless Sensor Networks", Department of Computer Science and Engineering, Ohio State University, Columbus, OH, June 8, 2005.

"Topology-aware Single Packet Attack Traceback", Northrop Grumman, Omaha, NE, March 16, 2005.

Keynote Speech, "Cyber Crime Scene Reconstruction", Symposium on Computer Forensics 2004: Research, Education, and Practice, St. Paul, MN, October 15, 2004.

"Stepping Stone Attack Attribution in Non-Cooperative IP Networks", Computer Forensics Working Group Meeting (CFWG), Baltimore, MD, August 9, 2004.

"Keep Kids Safe On-Line", Annual meetings of Iowa Mother of Multiples, Boone, IA, May 1, 2004.

Patents

Yong Guan and Linfeng Zhang, "Detecting Click Fraud in Pay-Per-Click Streams of Online Advertising Networks", US Patent Application, No. 12/187,055, August 6, 2008.