CSSE 490 -- Computer Security -- Spring 2004
Quiz 5
Thursday, March 18, 2004
Name:_________________________________________ Grade:______________
Security Level Subject Object
Top Secret (TS) Groucho Salary Files
Secret (S) Chico Customer Files
Confidential (C) Harpo Telephone Logs
Unclassified (U) Gummo Web Pages
1. List all the subjects who can read:
a) Salary Files
b) Customer Files
c) Telephone Logs
d) Web Pages
2. List all the subjects who can write:
a) Salary Files
b) Customer Files
c) Telephone Logs
d) Web Pages
The Marx Company has 3 categories: Research(R), Production(P), and Marketing(M).
Groucho and Chico have clearance for Research, Groucho and Harpo have clearance
for Production, and Chico and Gummo have clearance for Marketing.
3. Who can read objects classified:
a) ( S, {R} )
b) ( S, { P, M})
4. Who can write objects classified:
a) (C, {P, M})
b) (C, {M})
5. Groucho needs to send a Classified document about Production to Harpo. Can he
do that? If so, why? If not, why not?