Mobile Ad hoc Networks as a result of their self-motivated active topology are further predisposed to have security complications. Mobile Ad hoc Networks are definitely liable to various sorts of attacks as they stay ad hoc. Amongst plentiful attacks, black hole, flooding and packet drop attacks stand extra menacing attacks that condense the network performance beneath innumerable constraints. Detecting malicious nodes hurling black hole attacks is a great challenging task. Owing to this tricky situation, there is a necessity to design a new methodology for vindicating those attacks. Intrusion Detection Systems (IDS) are introduced in MANETs to keep track of the activities like detecting any intrusion in the so called network. In this paper a Superior Intrusion Detection System (SIDS) is proposed for a MANET, for detecting the malicious nodes in the network using RSA Algorithm integrated with Blowfish algorithm. © 2018, Institute of Advanced Scientific Research, Inc. All rights reserved.