New Constructions for UC Secure Computation Using Tamper-Proof Hardware

The Universal Composability framework was introduced by Canetti to study the security of protocols which are concurrently executed with other protocols in a network environment. Unfortunately it was shown that in the so called plain model, a large class of functionalities cannot be securely realized. These severe impossibility results motivated the study of other models involving some sort of setup assumptions, where general positive results can be obtained. Until recently, all the setup assumptions which were proposed required some trusted third party (or parties). Katz recently proposed using a physical setup to avoid such trusted setup assumptions. In his model, the physical setup phase includes the parties exchanging tamper proof hardware tokens implementing some functionality. The tamper proof hardware is modeled so as to assume that the receiver of the token can do nothing more than observe its input/output characteristics. It is further assumed that the sender knows the program...

• Type: Conference
• Year: 2008
• Where: EUROCRYPT
• Authors: Nishanth Chandran, Vipul Goyal, Amit Sahai
• Keywords: Cryptology, EUROCRYPT 2008, Hardware Token, Setup Assumptions, Tamper Proof Hardware