Wireless ad-hoc sensor network is gaining popularity in all organization and it is basic means for communication. Wireless ad-hoc sensor network is vulnerable to Denial of Service (DOS) attack.DOS attack make the network resources is unavailable to users. In DOS attack it makes the node to consume more battery power and degrades the network performance. Various techniques are used for detection and prevention of DOS attack such as spread spectrum, packet leash, lightweight Secure Mechanism and energy weight monitoring system but DOS attack cannot fully prevented using this techniques. This paper reviews various types of DOS attacks and its Detection techniques.

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Nowadays, people around the world completely depend and mostly use the Internet to maintain communication, contact with family, friends and with people around the world, access and exchange information, and enjoy multimedia communication. As the use of internet increase then users those who use internet and Access the information using internet in the organization or outside organization also increase. User Data security is very tedious and important part of IT system and its user lifecycle control system. Because of this the reason user data security is always consider while designing security systems for an organization. Modern approaches are to maintain the track of users and records of user access, Identity management systems and Access Management Systems are used. Identity management system help to provide a super-set of user provisioning systems that provide easy management of user credentials and their identity information to users and others those who need that information. Similarly Access Management Systems provide strong authentication and authorization solution using SSO, WebSEAL, and policy-based approach to identify who can access the resource at what level. The new research and approaches provide such a new functions base on organization policies that help to re-engine the access of user base on security procedures to the resources which are available. This paper provides an overview of the Identity Management Systems Access Management System and Federated Identity Manager that how they are use to manage the user security and also the challenges or risks in implementing a Secure system.

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