An assurance case is a body of evidence organized into an argument demonstrating that some claim about a
system holds, i.e., is assured. Assurance cases are used to comment about system safety and it serves as a mean to
show that the systems acceptably satisfy their safety properties. Assurance cases perform rigorous security analysis
on safety-critical complex systems. In this paper, the analysis done is an approach to documenting an assurance case
for system security, i.e., a security assurance case. The paper deals with the Assurance cases for Generic Avionic
Mission Control Computer system, by constructing tangible claims and investigating potential vulnerabilities