基于周期耦合处理的CAN总线数据组合加密方法

doi:10.11959/j.issn.1000-436x.2023017

Abstract

Abstract:

In the intelligent connected age, CAN bus transmission faces the urgent demand of light weighted security encryption.Based on this, a fast response and high security CAN bus data encryption method was proposed.Since the 64 bit CAN packets were sent periodically, an online-offline block encryption algorithm coupled with message transmission cycle was proposed.In offline phase, the dynamic session key was generated by using advanced encryption standard.In online phase, the dynamic session key was used to quickly respond to encryption and decryption requests.The online computation delay was greatly reduced by the pre-encryption computation in offline phase, which helped achieving low latency and lightweight computation.At the same time, the ciphertext policy attribute based encryption was used to encrypt the block cipher.The access control policy made by the data sending OBU ensures that only the target OBU can decrypt the block cipher, so as to achieve targeted encryption.

Key words: CAN bus, online-offline, block encryption, low latency encryption, connected vehicle

CLC Number:

TN918.8

Wutao QIN, Peng WANG, Yufeng LI. Combined encryption method for CAN bus data based on periodic coupled processing[J]. Journal on Communications, 2023, 44(1): 29-38.

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References 17

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统计项	密钥调整一位	明文调整一位
平均雪崩率	50.48%	49.88%
雪崩率1σ值	6.14%	6.40%
雪崩率3σ上下限	[32.06%, 68.90%]	[30.67%, 69.09%]
调整前	F1 5F EC A9	F1 5F EC A9
某帧密文	E8 D1 06 1F	E8 D1 06 1F
调整后	CF 98 A7 1E	FD 43 83 AF
	B0 93 EF 52	CF F2 F3 D5

统计项	DES	3DES	AES	OOAES
总耗时/ms	8.329	24.306	79.416	28.730
加密耗时/ms	4.002	11.982	14.009	14.334
解密耗时/ms	4.008	11.969	65.067	14.085
在线段运行耗时/ms	8.329	24.306	79.416	0.0853

统计项	数量/组
＜0.5 ms	60
0.55～0.65 ms	240
0.65～0.7 ms	117
0.7～0.75 ms	583
＞0.75 ms	0

Combined encryption method for CAN bus data based on periodic coupled processing

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