Networking and Wide-area Systems Group

Reputation, Trust, and Identity Management

PaperSpeckle: PaperSpeckle is a new low-cost watermarking solution developed to show that any piece of paper can be uniquely watermarked using a pen and $50 microscope. Epothecary: A system which uses built-in functionality in midlevel mobile telephones including cameras, SMS, and optionally GPS to construct a robust system for tracking and verifying the pedigrees of pharmaceutical products at every point in the distribution chain. Signet: Signet is a system which uses the computational power of commodity mobile telephones and security enabled Subscriber Identity Module (SIM) cards to create a secure and auditable record for atomic in-person transactions in the developing world. Signet performs this function at very low operating cost and without requiring continuous connectivity to a trusted third party.