Second Summary Report on Multiparty Protocols Second Summary Report on Multiparty Protocols

Project co-funded by the European Commission within the 6th Framework Programme Dissemination Level PU Public X PP Restricted to other programme participants (including the Commission services) RE Restricted to a group specified by the consortium (including the Commission services) CO Confidential, only for members of the consortium (including the Commission services) The information in this document is provided as is, and no warranty is given or implied that the information is fit for any particular purpose. The user thereof uses the information at its sole risk and liability. Abstract This report summarizes the state of the art and open problems in the area of secure multiparty protocols. The report is divided into three chapters. The first chapter briefly discusses some common (mostly cryptographic) primitives used in multiparty protocols, namely broadcast channels, secret sharing, and threshold cryptography. Our current knowledge in these areas is summarized. The remaining chapters then continue with the presentation of some specifically active research areas in secure multiparty computation, and states important open problems in each of these areas. Here, the second chapter treats generic protocols for secure multi-party computation, while the third chapter considers several practical scenarios and specific protocols in these cases.