# 自駕車期末note

Questions when reading papers:
1. What are some concerns?
2. Goals?
3. Challenges?
4. What are the differences to IoT?
- Existence of RSU
- keep moving
- Conditional privacy
5. Performance improvement: batch authentication

寫在intro
why used smart card?

結論：

### An Improved Authentication Scheme for Internet of Vehicles Based on Blockchain Technology 2018

Roles:
1. trusted cloud service providers
2. roadside units
3. vehicles
Server and roadside units form an distributed network
Zokrate: zk-SNARKs on smart contract

Challenges:
1. Many untrusted node (not authenticated vehicles)

Assumption:
1. Always online (don’t concern about offline-authentication)

### An efficient blockchain-based privacy preserving scheme for vehicular social networks 2020
- use pBFT consensus algorithm
- address privacy issues
- 分辨資料可性度

System model:
roles
1. trusted authority
2. cloud service provider
3. road site units
4. vehicles

Misc:
1. index vehicles under same RSU as a group.
2. How do identify trustworthyness? 用戶會謊報已取得利益

H0(x||PVIDVi ||Treg)

$PVID_{V_i} = H_0(ID_{V_i})$

$k = H_0(x\ ||\ PVID{V_i}\ ||\ T_{reg})$

$C_3 = H_1(PVID_{V_i}\ ||\ k)$
, where $x$ is the private key and $\ T_{reg}$ is registration time.

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Btm

### Speech content:
An Internet of Vehicles (IoV) allows for vehicles on roads to form a self-organized network.However, in the absence of an effective security and privacy measurement, an adversary can easily gather the transmitted data via networks that typically contain the private data of vehicle users.