Dual-CPU communication method based on white-box key

The invention provides a dual-CPU communication method based on a white-box key in the technical field of payment security, and the method comprises the steps: S1, an SP generates a first key factor, encrypts the first key factor to obtain first encrypted data, and transmits the first encrypted data to an AP; s2, the AP decrypts the first encrypted data to obtain a first key factor and generate a second key factor; s3, the universal CPU generates a first session key based on the first key factor and the second key factor, calculates a first verification value, encrypts the first verification value and the second key factor through the white box key to obtain second encrypted data and sends the second encrypted data to the SP; and S4, the SP decrypts the second encrypted data to obtain a first verification value and a second key factor, generates a second session key based on the first key factor and the second key factor, calculates a second verification value, verifies the second verification value, and send