Xing-Wang Wang

Cryptanalysis and Repair of"Decentralized Multi-authority ABE for NC$^1$ from BDH"

We present a plaintext-recovery attack on both the DBDH-based construction and the CBDH-based variant of Datta, Komargodski, and Waters (Journal of Cryptology, 2023). The attack succeeds with probability one in the claimed static security model using one corrupt authority and two users, each unauthorized even when gran...