Cloud data semi-quantum security sharing method and system based on proxy re-encryption

Abstract

The invention belongs to the technical field of quantum communication, and discloses a cloud data semi-quantum security sharing method and system based on proxy re-encryption, and the method comprisesthe steps: enabling an authorization end to generate a binary random number through a quantum random number generator, encrypting binary data through the random number, and storing the binary data into a cloud server; enabling the authorization end and the cloud server to share a binary key through a quantum key distribution protocol; enabling the authorization end to use a random number to encrypt the shared key as a conversion key and send the conversion key to the cloud server; and enabling the cloud server to use the shared key encryption conversion key as a final conversion key, and usethe final conversion key to convert the encrypted data stored in the cloud server into secret data which can be shared by the receiving end, and enabling the receiving end to decrypt the secret data by using the own key to perform data sharing. Compared with some quantum secret sharing schemes based on an entangled state or quantum computing, the loud data semi-quantum security sharing method andsystem do not need to prepare a multi-particle entangled state, and do not need quantum Fourier transform and a d-level quantum system, thereby reducing the complexity and difficulty of implementation.

Description

technical field [0001] The invention belongs to the technical field of quantum communication, and in particular relates to a semi-quantum secure sharing method and system for cloud data based on proxy re-encryption. Background technique [0002] At present, while cloud storage provides convenience for the storage and sharing of massive data, it also brings security risks. In terms of data sharing, most of the previous practices were to directly store data on the server, and then restrict it through access control methods, so that users with access rights can share it. However, this approach is not suitable for the cloud computing environment, because storing data in plain text cannot guarantee the confidentiality requirements for service providers, and once the cloud data service center is illegally invaded, the security of user data will be lost live. [0003] Proxy re-encryption is a method of secret sharing, but it is different from common secret sharing. In general, s...

AI Technical Summary

Problems solved by technology

However, there is currently no scheme for quantum proxy re-encryption

[0005] Through the above analysis, the existing problems and defects of the prior art are as follows: (1) The classic proxy re-encryption scheme provided by the prior art cannot realize one-time encryption, especially when the same data is shared multiple times

Poor security against chosen plaintext attacks and chosen ciphertext attacks during each sharing of the same data

[0006] (2) Some previous data sharing schemes cannot flexibly realize fine-grained secret data sharing

[0007] (3) The existing quantum secret sharing technology requires the preparation of multi-particle entangled states, or requires quantum Fourier transform and d-level quantum systems, resulting in increased complexity and difficulty in communication

It is difficult to achieve fine-grained data sharing for a specific data

[0010] (3) Most of the existing quantum secret sharing technologies rely on the entanglement characteristics of entangled states to realize secret sharing, so it is necessary to prepare multi-particle entangled states that are more complex than Bell states, or to perform Bell state measurements, Z-based measurements, or Reflecting more complex measurements or operations, the difficulty of implementation is greatly increased, and current technical means are almost impossible to achieve; there are also some quantum secret sharing schemes that use quantum Fourier transform to achieve quantum secret sharing. Quantum Fourier transform has high theoretical efficiency. However, in the specific implementation, it is necessary to realize the complex quantum circuit composed of multiple H gates and controlled revolving gates (such as the simplest controlled S gate and T gate) of the d-level quantum system, which is more difficult to realize. The current technical means almost impossible

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