Security Analysis of the Khudra Lightweight Cryptosystem in the Vehicular Ad-hoc Networks

• Wei Li,
• Chenyu Ge,
• Dawu Gu,
• Linfeng Liao,
• Zhiyong Gao,
• Xiujin Shi,
• Ting Lu,
• Ya Liu,
• Zhiqiang Liu,

Vol. 12, No. 7, July 30, 2018
10.3837/tiis.2018.07.023 , Download Paper (Free):

• VEhicular Ad-Hoc Networks
• Khudra
• Lightweight Cryptosystem
• Differential Fault Analysis

Abstract

With the enlargement of wireless technology, vehicular ad-hoc networks (VANETs) are rising as a hopeful way to realize smart cities and address a lot of vital transportation problems such as road security, convenience, and efficiency. To achieve data confidentiality, integrity and authentication applying lightweight cryptosystems is widely recognized as a rather efficient approach for the VANETs. The Khudra cipher is such a lightweight cryptosystem with a typical Generalized Feistel Network, and supports 80-bit secret key. Up to now, little research of fault analysis has been devoted to attacking Khudra. On the basis of the single nibble-oriented fault model, we propose a differential fault analysis on Khudra. The attack can recover its 80-bit secret key by introducing only 2 faults. The results in this study will provides vital references for the security evaluations of other lightweight ciphers in the VANETs.

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