Security in Computing (3rd Edition)

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1 August 29, 2005 © Doug Tygar, 2005 (cs161.org) CS 194-1 (CS 161) Access Control Doug Tygar ([email protected]) September 2, 2005 cs161.org August 29, 2005 © Doug Tygar, 2005 (cs161.org) Role of Access Control Before closing “back doors” we need to close “front doors” Access control: determines access to files & processes in OS We will return to these themes throughout the course August 29, 2005 © Doug Tygar, 2005 (cs161.org) Classic models of security Computer security has its origin in military models of security Different levels of secrecy e.g. classified/secret/top secret Compartmentalized security e.g. nuclear, communications, etc. TS/SCI August 29, 2005 © Doug Tygar, 2005 (cs161.org) Corresponding access control Classic model Mandatory Access Control (MAC) (we also use the abbreviation MAC for “message authentication code”) User controlled security Discretionary Access Control (DAC) August 29, 2005 © Doug Tygar, 2005 (cs161.org) Subjects & Objects Subjects do things Objects have things done to them Access types are the things that are done August 29, 2005 © Doug Tygar, 2005 (cs161.org) Subjects & Objects Subjects do things users, processes … Objects have things done to them files, processes … Access types are the things that are done read, write, append, list, detect, remove, execute …
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2 August 29, 2005 © Doug Tygar, 2005 (cs161.org) Read and write are different Access types can be distinguished by whether they pass information Generally “write” passes information
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