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Background/Objectives: Although, several security mechanisms have developed for vehicle navigation system yet there is a need of more advancement in existing or development of new security architectures. The main objective of this paper is to provide security and authenticity for vehicle navigation system. Methods/Statistical Analysis: Existing cryptography algorithms and fault tolerance technique helps to designed novel secure architecture. A fault tolerance based mathematical model is used for system analysis. The inputs for the system are latitude, longitude and digested engine number. Findings: It has been observed that designed system is able to provide the correct information in spite of corrupted signal is sensed at destination end (at server side). Application/Improvements: Designed secure and authenticated architecture which improve fault tolerance by applying fault tolerance technique on digested information and also reduces server overhead.