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Cyber Security Engineering: A Practical Approach for Systems and Software Assurance by Carol C. Woody, Nancy R. Mead

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Appendix A. WEA Case Study: Evaluating Security Risks Using Mission Threads1

1. Originally published in CrossTalk September/October 2014.

by Carol Woody, PhD, and Christopher Alberts

Importance of Systems of Systems

Everything we do these days involves system and software technology: Cars, planes, banks, restaurants, stores, telephones, appliances, and entertainment rely extensively on technology. Much of this capability is supported by systems of systems—independent heterogeneous systems that work together to address desired functionality through complex network, data, and software interactions. The Wireless Emergency Alerts (WEA) service is a good example of a system of systems.

WEA enables local, tribal, state, territorial, and federal public ...

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