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Operating Systems II, Spring 2004, HW 6
This will be covered in practise session during the week 19 (4-6.5.2004)
- Password search
- Problem 15.1 from text book [Stal01, p. 690]
- Problem 15.4 from text book
- What can you deduce from this?
- Password salt
- Problem 15.7 from text book
- Problem 15.8 from text book
- Is there real practical advantage with salt?
- Multilevel security
- Problem 15.9 from text book
- Problem 15.10 from text book
- Why would MAC be safer than DAC (discretionary access control)?
- "No read up" and "no write down" MAC policy protects data access,
but not data integrity. Why? Give an example.
- User A owns file ASecret, which only A can read or write. A has program AGame, which can use file ASecret during execution? A lets user B play the game AGame and during playing B can read or write file ASecret.
- How would one implement the scheme described above in UNIX?
- How would one implement the scheme described above in W2000?
- How does the situation change, if B should be able read ASecret during
playing, but not to write into it?
Give new answers to parts a and b.
- Clustering and Grid-computing (as defined in Lecture 12 slide 41)
- Give an example application that would be suitable for Beowulf Linux Cluster'iin, but not for Windows 2000 Cluster Server. Why?
- Give an example application that would be suitable for clusters but not for grids. Why?
- Which synchronization primitives are suitable for SMP, but not for clusters? Why?
- Which synchronization primitives are suitable for clusters, but
not for grids? Why?
Teemu Kerola 26.04.2004 13:48