This work demonstrates a new method to generate decryption keys in attributed-based encryption, highlighting solutions to key-escrow problems.
Attributed-based encryption (ABE) enables fine-grained access control over encrypted data. However, ABE requires a single trusted authority to issue decryption keys, which makes ABE have a key-escrow problem. If an adversary breaks through the system, then the adversary can decrypt all ciphertext encrypted through the system. In this work, we generalize the notion of registration-based encryption (RBE) to key-policy attributed-based encryption (KP-ABE). Through the introduction of RBE, users can autonomously generate their own keys, thereby effectively resolving the key-escrow problem of KP-ABE.
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Kao et al. (2025) studied this question.
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