Latest

• I graduated and moved to San Diego; I am a Postdoc with the Security and Cryptography Research Group at UCSD
• SIGCOMM talk is now available for download here.
• Here is click-spam data that I collected over Dec 2011 - June 2012.

Research Interests

I enjoy Computer Networks. I have dabbled in diverse areas like Wireless networks, Privacy in Mobile Networks, Recommendation systems in Social Networks, Botnets, to name a few.

I began my PhD work, looking at the problem of link prediction at a massive scale in social networks, followed by how to discover friends in a privacy-preserving manner in mobile social networks. Finally, I worked on the general problem of analysis of social network graph at scale.

Currently, I am focusing at the problem of click-spam in ad networks. Here is click-spam data that I collected over Dec 2011 - June 2012.

Publications

• ViceROI: Catching Click-spam in Search Ad Networks,(CCS 2013)


• Model-driven Energy-Aware Rate Adaptation, (Mobihoc 2013)


• Measuring and Fingerprinting ClickSpam in Ad Networks, (SIGCOMM 2012) | bibtex | slides
  Vacha Dave, Saikat Guha and Yin Zhang


• Clustered Embedding of Massive Social Networks, (SIGMETRICS 2012)
  Han Hee Song, Berkant Savas, Tae Won Cho, Vacha Dave, Zhengdong Lu, Inderjit Dhillon, Yin Zhang and Lili Qiu


• Secure Friend Discovery in Mobile Social Networks,(INFOCOM 2011)
  Wei Dong, Vacha Dave, Yin Zhang and Lili Qiu


• Scalable Proximity Estimation and Link Prediction in Online Social Networks, (IMC 2009)
  Han Hee Song, Tae Won Cho, Vacha Dave, Yin Zhang and Lili Qiu

Office Hours

Teaching

• Introduction to Operating Systems
• Graduate Wireless Networks(CS 386W)
• Graduate Communication Networks (CS 386M)
• Advanced Computer Networks (CS 378)
• Intoduction to Computer Security (CS 361)
• Computer Networks (CS356)

Presentations

Measuring and fingerprinting click-spam talk: A work that shows that its possible to estimate the amount of click-spam in an ad network, as an advertiser, and shows that mobile and social ad networks have high spam. Also detects several ongoing attacks.

Wireless Networks Project (EE382V) Presentation: An NS2 study which shows that transmitting at the highest data rate in a linear chain 802.11 Network does not always result in the highest throughput.

NS2 Tutorial Presentation : An introductory presentation to NS2, with three example scripts, that I gave as the TA for the Advanced Computer Networks (CS378) class.

Other Stuff

Code Snippets and Utilities Some code snippets and utilities, that I have picked up, as part of work.