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Coexistence of safety and security: Synchronized redundant system with security enhancements
Author(s) -
Valdivia Leonardo J.,
Adin Iñigo,
Añorga Javier,
Arrizabalaga Saioa,
Mendizabal Jaizki
Publication year - 2019
Publication title -
quality and reliability engineering international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 62
eISSN - 1099-1638
pISSN - 0748-8017
DOI - 10.1002/qre.2421
Subject(s) - certification , computer science , iec 61508 , reliability (semiconductor) , computer security , reliability engineering , functional safety , system safety , synchronization (alternating current) , life critical system , control system security , protocol (science) , security service , computer network , information security , engineering , software security assurance , software , operating system , channel (broadcasting) , law , power (physics) , quantum mechanics , political science , physics , alternative medicine , pathology , medicine
A malicious attack on a safety‐critical system can derive in an undesired behavior of the system that may result in a failure. In this case, the reliability of the device is decreased, and it might affect directly to safety. Therefore, the security is also an essential issue to consider in the design of safety‐critical systems. The main problem when safety and security are considered is to make them work together without interfering each other. A safety‐critical device needs to be certified following standards like IEC‐61508, and any security mechanisms must not affect this certification. This paper describes a system that integrates safety and security mechanisms to improve reliability without affecting safety certification. With the aim of reaching the required safety level, a redundant system is considered. This system is an n out of m distributed and synchronized voter. The synchronization method is based on the precision time protocol (IEEE‐1588) allowing that all devices on a local network have the same time.