车联网系统中的Sybil攻击检测方案大多使用匿名认证来保障车辆隐私安全,但这种认证方式在面对恶意车辆之间合谋发动Sybil攻击时将不具有有效性。本文阐述了现有的车联网身份认证技术中存在合谋攻击,并提出了一种较为有效的检测方案。 Sybil attack detection scheme in car networking system mostly uses anonymous authentication to protect vehicle privacy, but this authentication method will not be effective in the face of collusion between malicious vehicles to launch Sybil attack. This article elaborates on the existence of collusion attacks in the existing vehicle networking identity authentication technology and proposes a more effective detection scheme.