Cloud computing is a new information technology. It is the product of the scientific and technological development of the times and plays an important role in the development of this country. In order to effectively solve the security problem of cloud computing data access, an identity-based privacy protection algorithm for cloud computing is proposed. The user information is stored in the cloud server at the registration stage, and the user identity is verified by signature when the information is obtained. The strong forward secure signature scheme can ensure that the signature is both forward secure and backward secure. At present, most signature schemes based on lattice focus on forward security. Therefore, this article constructs a strong forward secure signature scheme based on lattice and applies this signature scheme to cloud user authentication to ensure security.
Blind signatures have been widely applied when privacy preserving is required, and the delegation of blind signature rights and a proxy blind signature (Proxy-BS) become necessary when the signer cannot sign. Existing Proxy-BS schemes are based on traditional cryptographically hard problems, and they cannot resist quantum attacks. Moreover, most current Proxy-BS schemes depend on public key infrastructure (PKI), which leads to high certificate storage and management overhead. To simplify key management and resist quantum attacks, we propose a post-quantum secure identity-based proxy blind signature (ID-Proxy-BS) scheme on a lattice using a matrix cascade technique and lattice cryptosystem. Under the random oracle model (ROM), the security of the proposed scheme is proved. Security shows that the proposed scheme assures security against quantum attacks and satisfies the correctness, blindness, and unforgeability. In addition, we apply the ID-Proxy-BS scheme on a lattice to e-voting and propose a quantum-resistant proxy e-voting system, which is resistant to quantum attacks and achieves the efficiency of e-voting.
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