Authors : Manjunath Kotari, H. R. Nagesh, Niranjan N. Chiplunkar
A distributed system is one in which components located at networked computers communicate and coordinate their actions only by passing message and that appear to the users of the system as a single computer  . Distributed systems that can evolve their behaviors based on changes in distributed systems environments are called as Adaptive Distributed Systems (ADSs). Security issue in distributed systems is a serious concern, whether it is adaptive or not. There are many possibilities of threats in distributed systems like, security threat occurring during communication and those in the form of unauthorized attempts to access stored information. In the adaptive distributed systems, some of the monitoring is usually done by a subsystem that is external to the target system. In this case, communication between the monitor and the target system can be intercepted by an unauthorized intruder -the classical `man-in-the-middle’ and their attack happens. This paper gives a survey of security aspects of different distributed systems shortcomings and proposes some solutions.
Keywords—ADS, MD, ID/II; MONITORED DATA