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Enhanced functional encryption with bilateral access control: Optimizing security, practicality, and efficiency
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AI
DOI：10.1016/j.csi.2026.104182.png)
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Abstract
En 中文
The inner product functional encryption (IPFE) is a powerful cryptosystem. However, in cases where different keys (vectors) form a maximal linearly independent system concerning the encrypted vector, these nonhomogeneous linear equations can inadvertently expose the underlying vector, and reveal sensitive information. While it is possible to control this process by integrating an Identity-Based Encryption scheme into IPFE, a constant bound on the number of keys will result in a linear decrease in the permissible decryption frequency of each ciphertext as the diversity of ciphertexts increases, since different encryption parties must share the common keyspace associated with the key identity. This limitation makes it difficult to utilize the IPFE scheme under identity granularity in scenarios with massive potential users. To address this thorny problem, we introduce the identity-based matchmaking encryption scheme (IB-ME) and improve its ciphertext matchmaking mechanism for splitting the key space of different ciphertext identities. This approach allows the number of IPFE scheme's key-decryption executions under the identity granularity, which initially had a constant limit, to transform into a resilient threshold that grows with the number of ciphertexts. Furthermore, we incorporate the above proposed enhanced ciphertext matchmaking mechanism into IB-ME, enabling the twice-identity matchmaking process of IB-ME to be accomplished through a single polynomial. This modification reduces the required base parameters and results in a more efficient IB-ME scheme. We also prove the security of the two schemes. The first scheme is under a selective security model, while the second one is under a standard security model. Finally, we compare the two proposed schemes with related schemes and apply them on a generalized platform.
Keywords:
IPFE
IB-ME
IBE
Access control
Formal proof
Security model
Journal
C
IF:
3.1
Papers:
65
Citations:
0
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