Lower Bounds for the Number of Decryption Updates in Registration-Based Encryption

ePrint Report: Lower Bounds for the Number of Decryption Updates in Registration-Based Encryption

Mohammad Mahmoody, Wei Qi, Ahmadreza Rahimi

Registration-based encryption (Garg, Hajiabadi, Mahmoody, Rahimi, TCC'18) aims to offer what identity-based encryption offers without the key-escrow problem, which refers to the ability of the private-key generator to obtain parties' decryption keys at wish. In RBE, parties generate their own secret and public keys and register their public keys to the key curator (KC) who updates a compact public parameter after …

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