Nowadays, large amounts of data are stored with cloud service providers. Third-party auditors (TPAs), with the help of cryptography, are often used to verify this data. However, most auditing schemes don't protect cloud user data from TPAs. A review of the state of the art and research in cloud data auditing techniques highlights integrity and privacy challenges, current solutions, and future research directions.

The heterogeneous network (HetNet) deployed small cells technology to overcome the problems of holes “blind spots” coverage in 3G and 4G mobile networks. In this paper, we propose a hierarchical HetNet layout comprises of three layers, macro, metro and femto cells. The interplay between successive layers due to handover (HO) traffic is considered. Accordingly, the femto cell serves indoor traffic activity of femto users, while metro cell serves the outdoor traffic activities as well as the overflow traffic from femto cells. The highest layer in HetNet, macro cell only serves macro users and the overflowed traffic from the lower layer. Then, we develop a realistic teletraffic model in order to measure the performance of the proposed HetNet. The numerical results show the capability of HetNet with coexisting small cells to offload traffic from traditional macro cellular network in terms of reducing the blocking probability.

This paper investigates the performance of Multihop connectivity for inter-vehicle communication (IVC) systems in Vehicular Ad Hoc NETwork (VANET). The hop path between two or more vehicles is dedicated when a broadcast signaling for initiation connectivity is successfully guaranteed. In addition, the performance of vehicular connectivity is not only based on maximum transmission range, but also based on the optimal distance headway. A new analytical model is proposed in order to determine the failure probability of connectivity based on distance headway, false initiation connectivity probability and broadcast signaling delay. Also, the successful probability of message hopping and outage connectivity probability are provided in Multihop vehicular ad hoc networks. The numerical results demonstrate the metrics performance of false and failure connectivity probability in terms of physical characteristics of the roadway, vehicular velocity, traffic density and broadcast signaling delay.