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Authentication is

  • A.hard to assure identity of user on a remote system
  • B.insertion
  • C.modification
  • D.none of the above

Answer: A

Correct answer: hard to assure identity of user on a remote system

Authentication is the problem of establishing that a user really is who the user claims to be, and it is genuinely hard across a network, where the system sees only the messages it is sent. Insertion and modification are kinds of attack on data rather than the process of establishing identity.

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