Reading up & writing down restrictions - Bell-LaPadula model
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(HW1) What is the effect of reading up and writing down restrictions imposed by the Bell-LaPadula model? And what is the effect of reading down and writing up restrictions imposed by the Biba model?
(HW2) Choose one of your favourite operating systems (e.g. Windows 2000/XP/Vista or UNIX) and compare its security policy with the Clark-Wilson model. Does its security mechanism satisfy Clark-Wilson axioms?
An optional homework (not required for submission - work on it only if you have time):
(HW3-OPTIONAL) Compare the Bell-LaPadula and Clark-Wilson models. List one or two applications of these protocols that you can imagine. Can one model be implied by the other? If not, is it possible to design a system to satisfy both models?
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Solution Summary
The restrictions and effects of the Bell-LaPadula Model are examined. The expert also chooses their favourite operating system and determines is the security mechanism satisfies Clark-Wilson axioms. The Bell-LaPadula and Clark-Wilsom Model are then compared.
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(HW1) What is the effect of reading up and writing down restrictions imposed by the Bell-LaPadula model? And what is the effect of reading down and writing up restrictions imposed by the Biba model?
The Bell-LaPadula model protects and controls data flow. The effect of reading and writing via its linear operation are that:
? For reading down: Subjects are only able to read objects from their current view and below their security level, thus not allowing them access to higher levels. For example, an airport ticket agent may only have access to "ticketing" but not to tariffs (e.g. taxes or pricing alterations) or any other high level flight operation data (baggage claims, gate operations, or corporate information, etc); they may be only able to view tickets and lower levels, such as the name, email address, or frequent flyer number of ...
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