Security and Functional safety: Impact and an integrated approach - to be presented at HazardEx 2012
20 December 2011
There is an increase in demand of the safety and security systems globally. Few factors contributing to the growth in this market include global acceptance of safety and security standards, aging of the deployed safety systems and change in attitude towards safety systems from cost to savings.
An integrated Safety and Security life cycle is being talked in the industry to reduce duplication of effort, while designing and delivering right the first time.
The initial part of the paper discusses the impact of security breaches on a safety issues in a plant. Security breaches like attacks, incorrect information, safety algorithm corruption, affecting any of the four safety states i.e. Up , Safe, Dangerous and Intermediate.
The later part of the paper discusses an approach addressing ‘security in safety’ in an optimal way. Most of the failures can be undetected, which will lower the score of Safe Failure Fraction due to Probability of Dangerous Undetected failures increasing. The commonly used safety assessments are based on FMEA, FMEDA, ‘Proven In Use’ and techniques discussed in IEC 61508, to qualify a system to be deployed in a safety environment.
A mathematical method based on reliability model resulting in a quantitative matrix is discussed here. This helps the product designers with decision matrix, giving the impact to security threats in addition to normal safety reliability analysis.
The paper also discusses method of predictive diagnosis and prevention. Benefits of this approach include an integrated Safety and security approach; focus on pure safety, pure security and safety threat because of security, early detection of issues, prioritization of counter measures, easy diagnosis, and traceability during maintenance and system upgrades.
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