Welcome to the resource topic for 2025/808
Title:
Partially Registered Type of Multi-authority Attribute-based Encryption
Authors: Viktória I. Villányi, Vladimir Božović
Abstract:Attribute-based encryption can be considered a generalization of public key encryption, enabling fine-grained access control over
encrypted data using predetermined access policies. In general, we distinguish between key-policy and ciphertext-policy attribute-based encryption schemes. Our new scheme is built upon the multi-authority
attribute-based encryption with an honest-but-curious central authority
scheme in a key-policy setting presented earlier by Božović et al., and it
can be considered an extension of their scheme. In their paper, trust was
shared between the central authority and the participating authorities,
who were responsible for issuing attribute-specific secret keys. The central authority was not capable of decrypting any message as long as there
exists an honest attribute authority. In our new scheme, we maintain this
feature, and add another level of security by allowing users to participate
in the key generation process and contribute to the final user-specific attribute secret keys. Users gain more control over their own secret keys,
and they will be the only parties with access to the final user-specific
secret keys. Furthermore, no secure channels, only authenticated communication channels are needed between users and authorities. After the
modifications our scheme will be closer to the registered multi-authority
attribute-based encryption. We refer to our scheme as a partially registered type of multi-authority attribute-based encryption scheme. We
prove the security of our scheme in the Selective-ID model.
ePrint: https://eprint.iacr.org/2025/808
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