Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ What is Security? ! Security is the practice of risk management • Deciding which risks can be accepted • Guarding against violation ! Risk increases with system complexity 2
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Trust ! Trusted entity will not divulge secrets 9 You Me 3rd Party Producer Hop Hop Consumer Circle of Trust Chain of Trust
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Goals ! Minimize risk at any given trust link • Minimize risk of exposure ! Get a secret securely from producer to consumer • Still, assume secrets may get eventually divulged 10
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Secret sprawl ! Secrets are distributed in a distributed system ! Limit access ! Audit when a secret was accessed by who ! Discover breach 14