Provable Security of the MaTsudik ForwardSecure Sequential Aggregate MAC Scheme Considering application to communication among wireless sensors, Ma and Tsudik introduced the notion of forwardsecure sequential aggregate (FssAgg) authentication in 2007. They also proposed an FssAgg MAC scheme composed of a MAC function and cryptographic hash functions at the same time. The security of their proposed scheme has not been analyzed yet and remains open. It is shown in this paper that a slight variant of the MaTsudik FssAgg MAC scheme is secure under reasonable and standard assumptions on security of the underlying primitives. An efficient instantiation of the underlying MAC function using a cryptographic hash function is also discussed.

Authentication Methods for UAV Communication Unmanned Aerial Systems (UASs) are being employed in many different applications, and with the increased usage security concerns become more accentuated. Communication links are core components of a UAS, and providing a secure communication channel is a necessity in which Authentication strategies play a major role. However, resourceconstrained devices cannot adopt offtheshelf security strategies that were not developed taking into account those devicesxe2x80x99 constraints. Because of that, new security strategies, including authentication, were purposed for these applications. In this paper, we analyze and compare two authentication protocols developed for WSNs and modified for UAV usage. Tests were performed analyzing time execution and CPU usage on securityspecific operation such as hash tables and elliptic curve operations.