Due to rapid development in the field of communication technologies, security has become the major issue in transformation level data and off-line data. It has further increased the need for online security and authentication for secure information exchange using covert channel and a modified model for data security with data hiding. The objective of this work is to implement a model for network security, using covert channels as a secure environment and covert protocol as a new standard for communication between multi parties but without disclosing the client’s details. The most important services to secure communication system are authentication, integrity and confidentiality. In this paper, we also propose a model for construction of secure network computation. Our construction is in the standard model and does not require random oracles. In order to achieve this goal, we introduce a number of new techniques.

Key words : Covert, Channel, Protocols, Language, Uncertainty, Redundancy, Detect ability and Data Hiding.