Abstract
Broadcast encryption scheme enables a sender distribute the confidential content to a certain set of intended recipients. It has been applied in cloud computing, TV broadcasts, and many other scenarios. Inner product broadcast encryption takes merits of both broadcast encryption and inner product encryption. However, it is crucial to reduce the computation cost and to take the recipient’s privacy into consideration in the inner product broadcast encryption scheme. In order to address these problems, we focus on constructing a secure and practical inner product broadcast encryption scheme in this paper. First, we build an anonymous certificate-based inner product broadcast encryption scheme. Especially, we give the concrete construction and security analysis. Second, compared with the existing inner product broadcast encryption schemes, the proposed scheme has an advantage of anonymity. Security proofs show that the proposed scheme achieves confidentiality and anonymity against adaptive chosen-ciphertext attacks. Finally, we implement the proposed anonymous inner product broadcast encryption scheme and evaluate its performance. Test results show that the proposed scheme supports faster decryption operations and has higher efficiency.
Highlights
Broadcast encryption is an efficient way to make secure group-oriented communication by distributing confidential information in an open channel to a certain set of intended recipients that are selected by the sender
Certificate-based broadcast encryption has attracted more and more attention [12, 13]. It has the feature of decentralization which makes it more suitable to be applied in the blockchain, so we build our scheme in the certificate-based cryptosystem. e motivation of this paper is to build a more feasible inner product broadcast encryption scheme with anonymity property. is new construction is more suitable to be applied to those scenarios whose broadcast plaintext needs further protection. e goals of our scheme can be summarized as the following: In terms of security, we aim to provide adaptive CCA security in the random oracle model
Jin and Yu-pu [33] proposed the notion of broadcast encryption for inner product predicate encryption under the standard model in 2012. e intended recipients output the plaintext via decryption in the scheme. en, Lai et al [8] constructed the first broadcast encryption for inner product scheme (IBBE-IP) under the random oracle model in 2018. It combines the identity-based broadcast encryption (IBBE) [23] scheme and the inner product encryption (IPE) [4] scheme which outputs the real value of the inner product via decryption to the user and is a special functional encryption that has potential practical applications
Summary
Broadcast encryption is an efficient way to make secure group-oriented communication by distributing confidential information in an open channel to a certain set of intended recipients that are selected by the sender. Kim et al [5] focused on the practical applications of the above schemes; they proposed a fully secure, function-hiding inner product encryption scheme which has obvious shorter secret key and ciphertext compared with the existing schemes. En, Lai et al [8] constructed the first broadcast encryption for inner product scheme (IBBE-IP) under the random oracle model in 2018 It combines the IBBE [23] scheme and the inner product encryption (IPE) [4] scheme which outputs the real value of the inner product via decryption to the user and is a special functional encryption that has potential practical applications.
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