Security Modelling : What is Security?. for Tsinghua University Clark Thomborson 12 March 2010. Questions to be (Partially) Answered. What is security? What is trust? “What would be the shape of an organisational theory applied to security?” [Anderson, 2008]
Security Modelling: What is Security?
12 March 2010
A1. Security and distrust are determined by human fears.
A2. Functionality and trust are determined by human desires.
A: M(B) → C
Alice: foo(Carol) → Bob
Alice authorises Carol to provide “foo” to Bob.
King, President, Chief Justice, Pope, or …
Peons, illegal immigrants, felons, excommunicants, or …
C, acting as a governmental agent
C, acting as a Gmail client
Peers, Group members, Citizens of an ideal democracy, …
Facilitator, Moderator, Democratic Leader, …
OS Root Administrator
Inspector-General (an elected officer)
Chair of User Assurance Group
Governments make things legal or illegal.
Our culture makes things moral or immoral.
The world’s economy makes things inexpensive or expensive.
Computers make things easy or difficult.
Arbitrator (a Trusted Third Party)