My research focuses on creating technologies that can efficiently extract useful information from any data without sacrificing privacy or security. I have been working on security and privacy issues raised by data mining and machine learning, privacy issues in social networks, security issues in databases, privacy issues in health care, applied cryptography for data security, risk and incentive issues in assured information sharing, use of data mining and machine learning for fraud detection, botnet detection and homeland security. Recently, I have been focusing on security, accountability and privacy issues in machine learning, and using blockchains for assured data sharing.