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Computer Security

by: Dr. Humberto Beier

Computer Security 22C 169

Dr. Humberto Beier
GPA 3.87


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This 11 page Class Notes was uploaded by Dr. Humberto Beier on Friday October 23, 2015. The Class Notes belongs to 22C 169 at University of Iowa taught by Staff in Fall. Since its upload, it has received 10 views. For similar materials see /class/228054/22c-169-university-of-iowa in ComputerScienence at University of Iowa.

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Date Created: 10/23/15
Feb 11 2005 Lecture 11 THE UvaEmnv k 220169 Computer Security Douglas W Jones Deparlmenl 1 Computer Science Hmterdcma n Channe e Domains The domain of a program component is The objects on which it may operate In general Each component may have a domain Granularity of a system Size of domains Fine one domain per insiruoiion Coarse oniy one domain at aii The needtoknow rule Nothing should be included in a domain Unless it is needed by the domain user What things do we want to be in domains variables system calls les memory segments functions methods network ports in sum a resources oti any Kind Mechanism versus Policy Policy What ought to be in each domain Mechanism how do we enforce this policy Sccpe runes prcgramm ng Hanguage Access ghts ns system Scope Rule Example int x void inc int p p void q int y inc ampx inc ampy inc int 0xBADBAD Policy questions Domain size Lots of little domains Raises deve epmeht eeet One big domain Ne interha eeeurity What to disclose what secrets to keep Assume the worst Venue eii defense in depth Role of operating systems Archaic operating systems provide adhoc mechanisms different mechanism per resource class Modern operating systems provide uniform mechanism independent of resource class Subject et tntenee study etnee t96 e Atmeet unknenn tn matketpteee lnterdomain Channels Overt channels Those that are intended by design messages tuneit en ea s Covert channels Those not intended in system design seven eemmun eat ens secret niten iaees Security of Overt Channels Validation of content parameter validity pass a pointer to an object from a to b ijeet net n dema n a abjth Es n dema n to pass code from a to b n t executab e n a exesutab e n b to must sheek safety Security from Covert Channels Hidden channels a kind of Trojan As with all Trojans anienneiie deieeiien ne guarantees eyeienn inspeeiien ean be nnieieed Unintended channels accidents Resource usage channels require ingenuity ie iind er use eiinninaie snared reseurees er inieei neise Uses of Covert Channels Communication between attackers attackers and malware components of malware Pathway for system attack buffer overflow attack is an example te ure et ve d ty cheek ng created a cevert chenne t


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