Abstract
Attribute-based conditional proxy re-encryption (AB-CPRE) enables ciphertext owners to carry out fine-grained decryption delegation control. In AB-CPRE schemes, we observe that the attributes associated with ciphertexts are explicitly stored along with the ciphertexts. This property is not appropriate for certain applications where attributes contain sensitive information.
We consider a new requirement for AB-CPRE: anonymity. Specifically, anonymity guarantees that no one, except users with corresponding secret keys, can gain any knowledge about the attributes related to a ciphertext. We give the formal model of anonymous AB-CPRE and propose a concrete construction. We prove that our proposed scheme is both secure and anonymous, without relying on random oracles.
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Mao, X., Li, X., Wu, X., Wang, C., Lai, J. (2018). Anonymous Attribute-Based Conditional Proxy Re-encryption. In: Au, M., et al. Network and System Security. NSS 2018. Lecture Notes in Computer Science(), vol 11058. Springer, Cham. https://doi.org/10.1007/978-3-030-02744-5_7
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