The invention discloses a method of interacting commands of a
transformer substation based on third-party
verification. A third-party certification device CA (
Certificate Authority) is introduced to verify permission and identity of both parties of the commands, the CA is utilized as a trusted source, and credibility of the CA is guaranteed by adopting an intelligent card or a digital
certificate technology, so that control permission and range of a target IED (
Intelligent Electronic Device) can be effectively controlled to prevent command information from being intercepted and tampered; the third-party certification device CA is utilized to repackage the command information, so that security of transmission information is guaranteed; a hashed value is used for verifying integrity of
mutual information, so that wrong data are effectively filtered, execution of the bad command is prevented, and
information security of a control process of the
transformer substation can be greatly improved. The method has the beneficial effects that: security of transmission of a
control signal in the
transformer substation is improved, so that the
signal is prevented from being intercepted or tampered, security of data is guaranteed, operation crowd is limited, illegal users are isolated,
information security is protected, the wrong data are effectively filtered, and execution of the bad command is prevented.