Data encryption method of power grid secondary security system and related device

The invention discloses a data encryption method and related device for a power grid secondary security system, and the method comprises the steps: obtaining a to-be-encrypted binary plaintext in the power grid secondary security system, the binary plaintext comprising a plaintext forwarded by a transformer substation telecontrol machine; rolling type exclusive-or operation is carried out on the binary plaintext according to bits, and a primary ciphertext is obtained and serves as one of transmission signals of a communication system; and carrying out interpolation operation and overflow operation on the binary plaintext, and carrying out push-type rolling operation to obtain a pseudo-ciphertext which is used as a transmission signal of a communication system. According to the data encryption method of the power grid secondary security and protection system, an authenticity ciphertext time-sharing transmission mode is adopted, and illegal decoding behaviors are confused; furthermore, interpolation parameters