From Blind to Oblivious Identity-Based Encryption: A Generic Compiler and Instantiations

Identity-Based Encryption (IBE) schemes were introduced to simplify public-key infrastructure by using any arbitrary strings as public keys. However, a longstanding criticism of IBE is the trade-off inherent in the ``key escrow'' problem: the design of IBE ensures that the authority possesses a master secret key that allows it to generate secret keys for any identity and, consequently, decrypt any ciphertext. While concepts such as Blind IBE and Accountable Authority IBE attempt to mitigate this