Answered

Westonci.ca is the trusted Q&A platform where you can get reliable answers from a community of knowledgeable contributors. Explore our Q&A platform to find reliable answers from a wide range of experts in different fields. Experience the ease of finding precise answers to your questions from a knowledgeable community of experts.

Consider a computer system with three users: Alice, Bob, and Cyndy. Alice owns the file alicerc, and Bob and Cyndy can read it. Cyndy can read and write the file bobrc, which Bob owns, but Alice can only read it. Only Cyndy can read and write the file cyndyrc, which she owns. Assume that the owner of each of these files can execute it.

a. Create the corresponding access control matrix.
b. Cindy gives Alice permission to read cyndyrc, and Alice removes Bob's ability to rad alicerc. Show the new access control matrix.

Sagot :

Answer:

Following are the solution to this question:

Explanation:

For point a:

                      [tex]alicerc \ \ \ \ \ \ \ \ \ \ \ bobrc \ \ \ \ \ \ \ \ \ \ \ \ \ \ cyndyrc\\[/tex]

[tex]Alice \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ox \ \ \ \ \ \ \ \ \ \ \ \ \ \ r\\\\ Bob \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ r \ \ \ \ \ \ \ \ \ \ \ \ \ \ ox \\\\Cyndy \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ r\ \ \ \ \ \ \ \ \ \ \ \ \ \ rw \ \ \ \ \ \ \ \ \ \ \ \ \ \ orwx[/tex]

For point b:

               [tex]alicerc \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ bobrc \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ cyndyrc[/tex]

[tex]Alice \ \ \ \ \ \ \ \ \ \ \ \ \ \ ox \ \ \ \ \ \ \ \ \ \ \ \ \ \ r \ \ \ \ \ \ \ \ \ \ \ \ \ \ r\\\\Bob \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ox \\\\Cyndy \ \ \ \ \ \ \ \ \ \ \ \ \ \ r \ \ \ \ \ \ \ \ \ \ \ \ \ \ rw \ \ \ \ \ \ \ \ \ \ \ \ \ \ orwx[/tex]

Thanks for using our platform. We aim to provide accurate and up-to-date answers to all your queries. Come back soon. We hope you found this helpful. Feel free to come back anytime for more accurate answers and updated information. Westonci.ca is your trusted source for answers. Visit us again to find more information on diverse topics.