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CMAC, also known as OMAC1, is an efficient message authentication code (MAC) and has been standardized by NIST and other organizations. It has been widely applied in IPSec, IKE and many wireless networks. Multi-user security captures a practical scenario where an adversary targets a particular service related to multiple users. Lots of MAC constructions have been rigorously analyzed in the multi-user model. However, the concrete analysis for CMAC in the multi-user model is still a blank in the literature. To fill the gap, we provide a concrete multi-user security bound for CMAC in this paper. Our bound is better than that from generic reduction and we observe that the online security of CMAC in the multi-user model does not degrade from the single-user model.

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Security Analysis of CMAC in the Multi-user Model

  • 会议论文

  • 发表日期：

    2025年

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  • Xiangyang Zhang,
  • Yaobin Shen,
  • Lei Wang

摘要

CMAC, also known as OMAC1, is an efficient message authentication code (MAC) and has been standardized by NIST and other organizations. It has been widely applied in IPSec, IKE and many wireless networks. Multi-user security captures a practical scenario where an adversary targets a particular service related to multiple users. Lots of MAC constructions have been rigorously analyzed in the multi-user model. However, the concrete analysis for CMAC in the multi-user model is still a blank in the literature. To fill the gap, we provide a concrete multi-user security bound for CMAC in this paper. Our bound is better than that from generic reduction and we observe that the online security of CMAC in the multi-user model does not degrade from the single-user model.