车载黑匣子基于无可信中心秘密共享的安全解码

Secure decoding of vehicle black box based on secret sharing without trusted center

车载黑匣子能记录车辆的行驶数据,是交通事故责任判定的重要依据,因此设计安全的黑匣子非常重要。基于秘密共享和椭圆曲线密码,提出高安全的黑匣子编码和解码模型。模型由秘密分发、安全编码、协同解码、秘密份额更新、联合颁发份额五个协议组成。协议族保证了车载数据的机密性和完整性,在无可信中心的前提下,实现了解码组成员的协同解码,解决了组成员份额泄露和成员变更等问题。模型具有完备性、公平性、动态性、前向安全和后向安全性等多种安全特性。

The function of a vehicle-mounted black box is used for recording the vehicle data.It is an important basic device for determining liability when a traffic accident happens.Therefore,secure design of a black box is very important.Based on secret sharing and elliptic curve cryptography,an encoding and decoding model with high security is presented in the paper.The model is composed of five protocols including distribution of the secret,secure coding,collaborative decoding,secret share update and jointly issued share.Because the protocol family has not any trusted center,but can ensure the confidentiality and integrity of vehicle data,and achieve the collaborative decoding and solve some problems such as the disclosure of secret shadow and the change of members.So it has the characteristic of com-pleteness,fairness,dynamic adaptability,forward security and backward security.