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Efficient Revocable Multi-Authority Attribute-Based Signcryption for Edge Server-Assisted IoT
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DOI：10.1109/tetc.2026.3719257.png)
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Abstract
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Internet of Things (IoT) technology has revolutionised data management. Cloud-assisted IoT solves the problem of limited storage and computing power of IoT devices, but data security issues, such as confidentiality, and authenticity remain a huge challenge. Multi-authority attribute-based signcryption (MA-ABSC) can effectively solve this problem and avoid the single-point bottleneck problem in attribute-based signcryption (ABSC) with a single authority. However, in existing MA-ABSC schemes the length of the user secret key and the ciphertext increases linearly with the number of authorities, which leads to more storage requirements for IoT devices. This paper proposes an efficient MA-ABSC scheme, in which both the length of the user secret key and the ciphertext are independent of the number of authorities. We also outsource part of the unsigncryption work to the edge servers to reduce the computation cost. In addition, our scheme enables efficient revocation of data users. Security analysis proves that MA-EABSC is indistinguishable under adaptive chosen ciphertext attacks, and existentially unforgeable under adaptive chosen message attacks. The experiments show that our scheme is very efficient and practical for edge server-assisted IoT.
Keywords:
Attribute-based signcryption
multi-authority
outsourced computation
access control
user revocation
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