Interplay of Security and Reliability using Non-uniform Checkpoints

Real time applications such as military aircraft flight control systems and online banking are critical with respect to security and reliability. In this paper we presented a way to integrate both by considering confidentiality and integrity services for security and nonuniform checkpoint strategy for reliability. The slack exploitation interacts in subtle ways for security in regards to the placement of checkpoint. The checkpoints are placed in to the task at low frequency in the beginning because the slack available can accommodate a large amount of work at risk and the frequency is increased there after considering the slack available. The security is applied to the data in two ways. First method introduces the security for the entire data at once whereas in the second method the data is divided into n uneven sections and each section is separately secured . That is at the start of the task basic security services are considered depending on the slack available. The security is increased gradually for the rest of the task but if there exist a fault, then at that point the security is maintained at the steady rate because of the limited slack. Compared to the first method the second method can provide up to a 32.3 percent higher security. While compared to the traditional checkpoint strategy, the non-uniform check pointing makes more efficient use of slack while increasing the overall security levels by 34.4 percent for the second method.