A data encryption method based on dynamic digital watermarking on-board CAN bus

A CAN bus and digital watermarking technology, applied in transmission systems, electrical components, etc., can solve problems such as increased data volume, increased bus transmission burden, and inability to prevent replay attacks, so as to prevent replay attacks, verify integrity, prevent Effects of tampering attacks

Active Publication Date: 2021-05-11
北京小墨数智科技有限公司
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Problems solved by technology

However, the amount of data encrypted by the traditional encryption algorithm is greatly increased, which will increase the transmission burden of the bus; at the same time, due to the uniqueness of the encryption key, this method cannot prevent replay attacks

Method used

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  • A data encryption method based on dynamic digital watermarking on-board CAN bus
  • A data encryption method based on dynamic digital watermarking on-board CAN bus

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the embodiments given in the accompanying drawings.

[0023] refer to Figures 1 to 2 As shown, the present embodiment provides a method for encrypting vehicle-mounted CAN bus data based on a dynamic digital watermark, including a watermark embedding method and a watermark extraction and verification method:

[0024] 1. Watermark embedding method

[0025] 1) Before sending the bus data D, the CAN bus data sending end first uses the pre-stored watermark to generate the key KW and the movement factor X, and generates the digital watermark Wm1 through the dynamic digital watermark generation algorithm;

[0026] 2) Then use the pre-stored watermark position to generate the key KWB to generate the watermark embedding position information P;

[0027] 3) if figure 2 As shown, the data sender first reduces the data D according to the position of the unused data bits in the message; then embe...

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Abstract

The invention discloses a vehicle-mounted CAN bus data encryption method based on a dynamic digital watermark. The method makes full use of the 8-byte data space in the CAN bus data frame, and encrypts the data without increasing the traffic, ensuring Data communication security can verify data integrity and prevent tampering attacks; at the same time, dynamic passwords are used to generate watermark information, which can ensure that each generated watermark information is only used and verified once, effectively avoiding the impact of replay attacks.

Description

technical field [0001] The invention relates to the field of vehicle bus network encryption, in particular to a vehicle CAN bus data encryption method based on a dynamic digital watermark. Background technique [0002] With the development of automobile technology, more and more automobiles use electronic bus structure, and CAN bus is the most widely used one. In recent years, car cracking incidents have become more and more prominent. The car CAN bus is a native unencrypted bus in the car system without any security processing. Therefore, hackers can obtain the authority to control functions such as steering and braking of the car through the CAN bus. However, for a long time due to technical limitations such as the computing and processing capabilities of the ECU and the bandwidth of the vehicle network, the CAN bus security protection method has been blank. [0003] At present, the security protection method for the CAN bus is mainly to encrypt the data through an encry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06
CPCH04L63/123H04L63/126H04L2209/608H04L2463/101
Inventor 冀浩杰徐迟秦洪懋左政赵付霞
Owner 北京小墨数智科技有限公司
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