Abstract To mitigate state exposure threats to long-lived instant messaging sessions, ratcheting was introduced, which is used in practice protocols like Signal. However, existing generally come with a high cost. Recently, Caforio et al. proposed pragmatic constructions, compose weakly secure ‘light’ protocol and strongly ‘heavy’ protocol, order achieve so-called on-demand. The light they has s...

Recently, underwater Wireless Sensor Networks (UWSNs) attracted the interest of many researchers and the past three decades have held the rapid progress of underwater acoustic communication. One of the major problems in UWSNs is how to transfer data from the mobile node to the base stations and choosing the optimized route for data transmission. Secure routing in UWSNs is necessary for packet d...

The role of multiple antennas for secure communication is investigated within the framework of Wyner’s wiretap channel. We characterize the secrecy capacity in terms of generalized eigenvalues when the sender and eavesdropper have multiple antennas, the intended receiver has a single antenna, and the channel matrices are fixed and known to all the terminals, and show that a beamforming strategy...