Power grid information encryption and authentication method, system and device and medium

The invention provides a power grid information encryption and authentication method, system and device and a medium, and belongs to the technical field of power grid information security. The method comprises the following steps: encrypting to-be-transmitted power grid information by using a predetermined symmetric encryption algorithm and a key to generate encrypted power grid information; encrypting a secret key used by the symmetric encryption algorithm by using an asymmetric encryption algorithm and a public key of an information receiving end to generate an encrypted secret key; sending the encrypted power grid information and the encrypted secret key to an information receiving end; in the information transmission process, performing identity authentication on the information receiving end through a preset identity authentication mechanism; after the authentication is passed, decrypting the received encrypted secret key by using a built-in private key through an information receiving end so as to obtai