Security

Thus securing a system involves following measures :

1. Preventing unauthorized access i.e. hiding the information from unauthorisation users.

2. Protection the system from malicious damage or misuse. Such intential misuse can be of the following kinds :

· Theft of information

· Unauthorized modification of data

· Unauthorized destruction of data

3. Protection the system against accidental misuse.

4. The term security is often associated with protection with however, there is a difference between them. Protection is defined as guarding the user information against user within the system whereas security is defined as guarding the user information against unauthorized user outside the system

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C omparison between real time and time sharing operating system P rotection and s ecurity • Protection refers to a mechanism for controlling the access of program s processes, or users to the resources defined by computer system. • The concept of protection came with the advent of multiprogramming where several processes compete for the use of CPU. • the purpose was to confine each users program to its assigned areaof memory so that the programs cannot interface and harm each other. • Protection in main memory is particularly important because of address translation. The purpose of protection is to allow concurrently running process to share the common physical address space. • Protection also ensure that only process that have gained proper authorization from the operating system can operate on memory segment , the CPU, files and other resources.

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