Computer forensics is the application of investigation and analysis techniques to gather and preserve evidence from a particular computing device in a way that is suitable for presentation in a court of law. Computer forensics is a branch of digital forensic science pertaining to evidence found in computers and digital storage media. From a technical standpoint, the main goal of computer forensics is to identify, collect, preserve, and analyse data in a way that preserves the integrity of the evidence collected so it can be used effectively in a legal case. General tasks investigators perform when working with digital evidence:
· Identify digital information or artifacts that can be used as evidence
· Collect, preserve, and document evidence
· Analyse, identify, and organize evidence
· Rebuild evidence or repeat a situation to verify that the results can be reproduced reliably
Collecting digital devices and processing a criminal or incident scene must be done systematically.
Keywords: Computer forensics, Collect, preserve, and document evidence.

Dr.Kathirvel Ayyaswamy, acquired, B.E.(CSE), M.E. (CSE) from University of Madras and Ph. D (CSE.) from Anna University. He has served in various positions at Deemed Universities, Autonomous Institution and Anna University affiliated colleges from 1998 to till date. He is currently working as Professor, Dept of Computer Science and Engineering, SRM Institute of Science and Technology, Vadapalani Campus at Chennai. He has worked as Lecturer, Senior Lecturer, Assistant Professor, Professor, and Professor & Head in various institutions. He is a studious researcher by himself, completed 18 sponsored research projects worth of Rs 103 lakhs and published more than 110 articles in journals and conferences. 4 research scholars have completed Ph. D and 3 under progress under his guidance. He is working as scientific and editorial board member of many journals. He has reviewed dozens of papers in many journals. He has author of 12 books. His research interests are protocol development for wireless ad hoc networks, security in ad hoc network, data communication and networks, mobile computing, wireless networks and Delay tolerant networks.