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An Efficient and Practical Authenticated Communication Scheme for Vehicular Ad Hoc Networks

This paper proposes an efficient and practical scheme for authenticated communication in Vehicular Ad Hoc Networks (VANETs). It aims to enhance message authentication and encryption while mitigating various types of attacks, including replay and impersonation attacks. The proposed scheme leverages Road Side Units (RSUs) to reduce computation costs and relies on elliptic curve cryptography for efficient processing. Performance and security analyses demonstrate that the scheme not only maintains high security standards but also offers improved efficiency compared to existing methodologies.

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An Efficient and Practical Authenticated Communication Scheme for Vehicular Ad Hoc Networks

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  1. An Efficient and Practical Authenticated Communication Scheme for Vehicular Ad Hoc Networks Source: IEEE Transactions on Vehicular Technology, Reviewing Presenter: Yung-Chih Lu (呂勇志) Date: 2011/03/04

  2. Outline • Introduction • Proposed Scheme • Security Analysis • Performance Analysis • Conclusion • Comment

  3. Introduction (1/3) • Goal • Message Authentication &Message Encryption • Against attack • Replay attack • Impersonation attack • Outsider attack • Saving resource • computation cost

  4. Introduction (2/3) • Vehicular Ad Hoc Network (VANET) RSC: Road Side Unit

  5. Introduction (3/3) • The Functions of Proposed Scheme • Traffic control schemes • Message Authentication • Entertainment service scheme • Message Encryption

  6. Proposed Scheme for Traffic Control (1/2) • Vehicle-RSU-Vehicle Communication Vi RSU Vj (IDVi, IDVj, M, TVi, Kvi⊕H(M||TVi)) 1.ComputesK’Vi =H(IDVi || x) 2. Decrypts Kvi⊕H(M||TVi) 3. 4.Checks M,Tvi 5. Selects t ∈ Z*n 6. Computes T= t．Q = (x1,y1) r= x1 mod n s= t-1．[H(M||TR)+x．t] 7.Broadcast (IDR, IDVj, M, (r,s), TR ) 1.Computes (s-1．H(M||TR))．Q+s-1．r．X)= (x1’,y1’) 2. Verifies r’ = r r’= x1’ mod n V: Vehicular M: Message TVi: Timestamp Kvi: A pre-shared key x: RSU’s private key t: Random number H(): one way hash function Q: base point over Elliptic Curve X= x．Q

  7. Proposed Scheme for Entertainment Service (2/2) • CSESPP Scheme Vi RSU (IDVi, Reg, TVi, H(Kvi||TVi)) K’Vi =H(IDVi || x) 1.ComputesK’Vi =H(Kvi||TVi) 2. Verifies H(K’vi||TVi) =H(Kvi||TVi) 3. R∈ Z*n 4. Computes SKi= H(Kvi||R) {ESKi(ES,R) ,R} 1.ComputesSKi =H(Kvi||R) 2. Decrypts ESKi(ES,R) 3. Check R V: Vehicular Reg: Request message TVi: Timestamp Kvi: A pre-shared key ES: Entertainment Service R: Random number H(): one way hash function CSESPP: Communication Scheme for Entertainment Services with Privacy Preservation

  8. Security Analysis (1/1) • Against attack • Outsider attack • Secret key • Impersonation attack • Secret key • Replay attack • Timestamp

  9. Performance Analysis (1/1) • Comparisons Table TEC_Mul: the operation time of point multiplication on the elliptic curve function Texp: the operation time of the modular exponentiation Tmul: the operation time of the modular multiplication

  10. Conclusion • A vehicle only needs to share one session key with RSU to communicate with the other vehicles. • The proposed scheme is more efficient than other scheme.

  11. Comment (1/2) • 本文主要貢獻簡述： • 所有認證與加密工作皆透過公認第三方(RSU)來進行, 搭配ECDSA簽章，降低Computation cost。 • 優點： • 提出橢圓曲線的point multiplication比modular exponentiation更有效率的概念，來降低computation cost。 • 缺點： • 錯字都集中在proposed scheme。 • Security Analysis缺乏證明。 • 當Vehicular周圍無RSU時，則無法進行authentication及encryption。

  12. Comment (2/2) • 作者需進一步說明: • 請解釋在Entertainment Service 中，使用隨機值R的用意。 • 明顯錯誤(含typos): • Page6, 倒數第3行S應改成 M • Page16, Figure1,第8行H’(IDVi||x) =⊕H(IDVi||x)應改成H’(M||TVi) =H(M||TVi) • Page16, Figure1,第13行x．t應改成x．r • Page18, Figure2,第5行K’Vi =H(Kvi||TVi)應改成K’Vi =H(IDVi || x)

  13. Li et al.’s Scheme for Traffic Control (1/2) • Vehicle-to-Vehicle Communication Vi Vj 1.Computes 1.Decrypts the message by Ht(SK) 2.Computes 3.check

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