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Privacy and security are major issues in MANET, especially when used in sensitive areas. Secure routing protocols have been developed/proposed by researchers to provide security and privacy at various levels. ALARM protocol (Anonymous Location Aided Routing in MANET) provides both privacy and security features including confidentiality, authentication and authorization. Location based routing is based on some assumptions in MANET ie location of the mobile nodes (using GPS), Time Clock of mobile nodes are loosely synchronized, mobility and Nodes has uniform transmission range. In the current work an effort has been done to review the ALARM protocol and identify some of the security problems in MANET. Further the work suggests a mechanism to prevent malicious activity (replay attack) in MANET using monitoring method.

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