MANETs (Mobile Ad-hoc NETworks) are used in very suspicious and critical scenarios such as military, disaster relief operations, mine site operations, emergency rescue operations etc. while operating in such critical situations it needs security and privacy. MANET uses location-centric paradigm rather than identity-centric paradigm that are used in most of the networks. Using this paradigm is well suited for privacy in hostile and suspicious mobile ad-hoc networks. For achieving privacy and security, various protocols are proposed. This paper presents a survey on various protocols that are used in mobile ad-hoc networks for achieving privacy and security under hostile and suspicious scenarios.