Cybercrime (or computer crime) refers to any crime that involves a computer and a network.
In general, a countermeasure is a measure or action taken to counter or
offset another one. In computer security a countermeasure is an action,
device, procedure, or technique that reduces a threat, a vulnerability,
or an attack
by eliminating or preventing it, by minimizing the harm it can cause,
or by discovering and reporting it so that corrective action can be
taken. The definition is as IETF RFC 2828that
is the same as CNSS Instruction No. 4009 dated 26 April 2010 by
Committee on National Security Systems of United States of America.