Signals are used to disrupt communications. Examples include
desynchronization of cryptographic systems by induction of bit or signal
alterations, the introduction of erroneous bits at a rate or distribution
such that checksums or CRC codes are unable to provide adequate coverage, and
the introduction of noise signals in a particular frequency range so as to
reduce effective bandwidth for a particular communications device or system.
Complexity: The basic issue in jamming is related to the efficient use of
limited energy. With enough energy, almost any signal can be overwhelmed,
but the amount of energy required to overwhelm signals across a wide
frequency band, it may take more energy than is easily available, and it is
normally relatively easy to locate and destroy such a large noise generation
system. The complexity then lies in determining the most effective use of
resources for jamming.