For each of the following entries in an access control list, give the type of ac

Question

For each of the following entries in an access control list, give the type of access allowed for each user of File221 and describe who is included in the WORLD category:

a. User2010 R - E -
b. User2014 - - E -
c. User2017 RWED
d. WORLD R - - -


Tip on writing the answer: The presentation of the four users above in a stack in the textbook is misleading. Your answer should be presented in "flat" Access Control List fashion, but state the permissions using the full words, not just the single letter(s) which represent the permission(s):
Example:

File Access
File967: User2009 Read and Delete User 2007 Read and Execute World Read

Explanation / Answer

   The access control list is a modification of the access control matrix and was used in the MULTICS operating system. Each file is entered in the list and contains the names of the users who are allowed to access it and the type of access each is permitted. To shorten the list, only those who may use the file are named. Those denied any access is grouped under a global heading such as “WORLD”.

    Some systems shorten the access control list even more by putting every user into a category: system, ower, group, and world.

SYSTEM is designed for system personnel who have unlimited access to all files in the system.

The OWNER has absolute control over all files created in the owner’s account.

An owner may create a GROUP file so that all users belonging to the appropriate group have access to it.

WORLD is composed of all other users in the system, that is, those who don’t fall into any of the other three categories. In this system the File Manager designates default types of access to all files at creation time and it is owner’s responsibility to change them as needed.

Related Questions

Navigate

• Browse (All)
• Browse F
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.