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two users a and b have the following privileges: a can read and write a file f, and read, write, and execute a service program p. b can only read f and execute p. an intruder has managed to perform one of the violations: (i) guess a's password. (ii) guess b's password. (iii) place a passive wiretap on a's terminal line and intercept all data communication, except for the password, which is protected through encryption. (iv) place an active wiretap on a's terminal line, which allows the interception of all communication, except the password, but also allows insertion of arbitrary new messages into the communication stream. (a) for each of the 4 violations, (i) through (iv), describe a simple scenario, if one exists, that would lead to each of the following violations: information disclosure. information modification or destruction. unauthorized use of services. denial of service.

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If an intruder guesses user A's password, they may be able to access and read the file F, write to the file F, and execute the service program P.

What are the possible scenarios?

Here are possible scenarios for each of the four violations, along with the resulting violations that may occur:

This could result in the following violations:

  • Information disclosure: the intruder may be able to read sensitive information from the file F.
  • Information modification or destruction: the intruder may be able to modify or delete the contents of the file F.
  • Unauthorized use of services: the intruder may be able to execute the service program P without authorization.
  • Denial of service: the intruder may be able to prevent user A from accessing the file F or the service program P.

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