In order to ensure that the balance of information, the
protection of all aspects of the network information to
conduct a comprehensive, thus make the barrel principles of
network information security. Barrel principle on the
system of security vulnerabilities and security threats of
every aspect, in the aspect of prevention to ensure that each
to break into the weakest place in the system can be found,
the design of information security system, evaluation and
testing of any part is not to be missed. Put an end to the
most common attack means successfully breached the
security of the system is a security mechanism and security
service design original motivation, but from another
perspective, is essentially in order to ensure the safety of the
whole syste