Security is major issues in today's world. Everything in today's world should be done securely. Likewise wireless network are also more vulnerable to various types of security attacks. Mobile Ad hoc NETworks (MANETs) is self-configuring wireless networks. MANET is an infrastructure less mobile network formed by a number of self-organized mobile nodes. So in order to guarantee secure network connection the authors opt for certificate revocation. The main challenge for certificate revocation is to revoke the certificates of malicious nodes promptly and accurately. This paper focuses to isolate attackers by the method of certificate revocation.