Vol.:(0123456789) Wireless Personal Communications https://doi.org/10.1007/s11277-020-07881-3 1 3 New MPR Computation for Securing OLSR Routing Protocol Against Single Black Hole Attack Abdellah Nabou 1  · My Driss Laanaoui 2  · Mohammed Ouzzif 1 Accepted: 29 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020 Abstract The Optimized Link State Routing Protocol (OLSR) operates as proactive routing protocol destined for Mobile Ad hoc Network, OLSR is considering as one of the four important routing protocols identifed by the Internet Engineering Task Force. The core of perfor- mance in OLSR routing protocol is the Multipoint Relays (MPRs) which are selected nodes responsible to forward broadcast messages during the fooding process in order to optimize the message overhead across the network. However, OLSR can be afected by the single Black hole attack that presents an active routing attack disturbs the network by dropping the forwarding packets. In this paper, we propose a new algorithm of selection for the MPR set in order to avoid malicious neighbors and select the thrust one by add a new criterion named as degree of forwarding. Our approach is based on exchanging acknowledgment Hello message between 2-hop neighbors when message HELLO is forwarded successfully between them, some modifcations in MPR selection process are also made to select the most secure MPR nodes. The simulation of our proposed solution gives highly motivated results compared to the standard version of OLSR routing protocol under the Black hole attack in diferent network metrics as the throughput, packet delivery ratio, End-to-End delay, jitter delay and packet lost. Keywords MANET · Node · Security · OLSR · MPR · Single Black Hole * Abdellah Nabou a.nabou@ensem.ac.ma My Driss Laanaoui d.laanaoui@uca.ma Mohammed Ouzzif oussif@gmail.com 1 RITM Laboratory, CED Engineering Sciences, EST, ENSEM, Hassan II University of Casablanca, Casablanca, Morocco 2 Department of Computer, Faculty of Sciences and Techniques, Cadi Ayyad University, Marrakesh, Morocco