Problem 3. Access Control (30 pt., 10 pt. each)

3. Assumption:

• Privileges: read (R), write (W), execute (X)
• Resources:
  • Image files: tamuc.jpg, jkim.png, csci351.gif
  • Document files: syllabus.doc, lecture.ppt
  • Binary files: a.exe, b.exe, c.exe
• Access permissions:
  • A has privilege to read all the image files.
  • B has privilege to read and write all the document files.
  • A and C have privilege to read syllabus.doc
  • A and B have privilege to read and execute a.exe, b.exe.
  • B and C have privilege to read tamuc.jpg.

1. Construct the corresponding access control matrix. To answer, use the format in Table 1.1 in the textbook.

2. Construct the corresponding access control list. To answer, use the format in Figure 1.5 in the textbook.

3. Construct the corresponding capabilities list. To answer, use the format in Figure 1.6 in the textbook.