Abstract: A rotation display method and apparatus for the screen of an on-board unit. The method comprises: obtaining first acceleration data of the screen of an on-board unit in the current cycle, and determining a screen display direction matching the first acceleration data as a first screen display direction according to a preset matching strategy (101); obtaining second acceleration data of the screen of the on-board unit in the next cycle, determining, according to the preset matching strategy, a screen display direction matching the second acceleration data, and if the screen display direction matching the second acceleration data is a second screen display direction, determining that the next cycle is a screen rotation effective cycle (102); and determining whether the number of continuous screen rotation effective cycles exceeds a preset number, and yes, controlling the screen of the on-board unit to rotate from the first screen display direction to the second screen display direction (103).

Abstract: The present application discloses a method and a device for vehicle security communication, a vehicle multimedia system, and a vehicle. The method applied to a security chip comprises: receiving a control instruction from a network system when the network system is connected, wherein the control instruction includes encrypted control data; decrypting the encrypted control data in the control instruction; obtaining the decrypted control data when the decryption is successful; and transmitting the decrypted control data to the vehicle body system to make the vehicle body system control the vehicle to perform a target operation according to the decrypted control data.

Abstract: The present application discloses a method and a device for vehicle security communication, a vehicle multimedia system, and a vehicle. The method applied to a security chip comprises: receiving a control instruction from a network system when the network system is connected, wherein the control instruction includes encrypted control data; decrypting the encrypted control data in the control instruction; obtaining the decrypted control data when the decryption is successful; and transmitting the decrypted control data to the vehicle body system to make the vehicle body system control the vehicle to perform a target operation according to the decrypted control data.