It involves some modification of data stream and can be sub divided into four categories

  1. Masquerade – It takes place when one entity pretends to be another entity
  2. Replay – It involves passive capture of data unit and its subsequent retransmission to produce unauthorized effect.
  3. Denial of service – The denial of service prevents or inhibits the normal use or management of communication facilities
  4. Modification of message – It simply means that some portion of legitimate message is altered or the message are delayed or reordered to produce unauthorized effect.

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