v2x implicit cert
doc
Alternative Applications of the SCMS V2X Infrastructure
Vehicle to Vehicle Safety Application using ECC PKI
IEEE 1609.2 and Connected Vehicle Security: Standards Making in a Pocket Universe
核心是满足v2v场景的限定条件：短时有效、匿名化、批量申请、字节数尽量少
适合可信节点的匿名化提交信息场景、可信身份的匿名化校验场景。。。
ecqv implicit certificate
SEC 4: Elliptic Curve Qu-Vanstone Implicit CertificateScheme (ECQV)
字节数少通过ecqv的方式实现
butterfly key expansion
IEEE 1609.2 and Connected Vehicle Security:Standards Making in a Pocket Universe
A Security Credential Management System for V2X Communications
短时有效、匿名化、批量申请通过butterfly key expansion机制实现
paper
Schnorr-based implicit certification: improving the security and efficiency of V2X communications
这篇是讨论把cert的hash（即h值）的乘法，挪到CA的公钥点上，而不是像原来的临时中间点。
由于CA的公钥点固定，就可以提前算好，节省时间
Accelerating V2X Cryptography through Batch Operations
EE从PCA获得批量V2X证书时，通过把证书校验的左右式子分别批量加法，合并基点、PCA公钥的乘法，减少运算量
ECDSA*批量校验也类似，其实是基于PCA的公钥相同的预设。注意ECDSA*是ECDSA的变种。这个的问题在于，批量数目越大，平均等待时延也会随之增大，效果不好说。
