Communicated information is replayed and causes unanticipated
side effects. Examples include the replay of encrypted funds transfer
transmissions so as to cause multiples of an original sum of money to be
transferred, replay of coded messages causing the repeated movement of
troops, replay of transaction sequences that simulate behavior so as to
cover up actual behavior, and the delayed replay of events such as races so
as to deceive a victim.
Complexity: Replay attacks are typically simple to perform and require
little or no sophistication. In some cases, relatively complex coding may
be required in order to reproduce CRC codes or checksums, but this is
normally not required for replay attacks.