Cryptanalysis and Discussion on Two Attribute-Based Encryption Schemes
Yi‐Fan Tseng, Jheng-Jia Huang, Hao-Yu Yang, Tsung-Yu Chien, Chieh-Han Wu · 2022
Attribute-based encryption (ABE), which was first conceptualized by Sahai and Waters in 2005, has been developed into one of the most popular research topics in modern cryptography. Various variants of ABE has been designed and proposed in literature, e.g., ABE supporting user/attribute revocation, pairing-free ABE, etc. In this work, we study two ABE schemes proposed by Sethia et al. and Guo et al., respectively, in 2001. We found that, the scheme of Sethia et al. is insecure against the collusion attacks, and the scheme of Guo et al. fails to revoke a user. Therefore, in this manuscript, we will review on their schemes, and give the corresponding cryptanalysis. Besides, the discussion on the reasons to the attacks and possible improvement will be presented as well.