该文将轻量级密码算法PRESENT用于智能卡芯片存储加密中,用于保证卡内代码及数据的安全。首先指出总线置乱方法存在选择明文攻击隐患,而异或加密方法在Flash擦除操作时会导致密钥泄露,进而指出引入PRESENT算法的重要性。同时,该文给出PRESENT算法在智能卡芯片中的具体实现方法,包括电路设计、密钥分散存储和故障攻击抵御措施。与传统方法相比,该文所提方法即保证了智能卡芯片运行的效率,又提高了存储加密的安全性。
The lightweight block cipher PRESENT algorithm is applied in the storage encryption algorithm of smart cards to provide security for the code and data in the card. This paper shows that the bus scrambling technique is susceptible to chosen-plaintext attacks, while the Exclusive OR encryption technique can be broken during the erasing of the Flash. The paper then describes implementation of storage encryption based on the PRESENT algorithm including the circuit design, the distributed storage of the key and countermeasures for fault attacks. The method ensures the security and efficiency of smart cards that is not possible withprevious methods.