1.1 In a multiprogramming and time-sharing environment, several users share the system
simultaneously. This situation can result in various security problems.
a. What are two such problems?
b. Can we ensure the same degree of security in a time-shared machine as in a
dedicated machine? Explain your answer.
Answer:
a. Stealing or copying one’s programs or data; using system resources (CPU, memory, disk
space, peripherals) without proper accounting.
b. Probably not, since any protection scheme devised by humans can inevitably be broken by a
human, and the more complex the scheme, the more difficult it is to feel confident of its correct
implementation