Offline/Online Lattice-Based Attribute-Based Encryption

Abstract

The invention discloses an offline / online lattice-based attribute-based encryption method. There are more and more scenarios of multi-user data sharing in 5G mobile networks. It is especially common to use attribute-based encryption technology to perform fine-grained access to user decryption permissions. Mobile devices have weak computing power and cannot complete encryption requests in a short time. Complicated calculations. Therefore, in order to improve the efficiency of encryption to apply to lightweight devices with weak computing power. The present invention performs preprocessing operations on key generation and encryption, which are divided into two stages: offline and online. In the key generation process, the offline phase does not need to know the attribute to generate the intermediate key, and the online phase generates the corresponding private key according to the attribute. During the encryption process, there is no need to know the message and access policy in the offline stage, and the complex calculations required for encryption are preprocessed. After the plaintext and access policy are known in the online stage, only a small amount of simple calculations are required to generate the ciphertext. Compared with the scheme based on LWE, the present invention has better computational performance.

Description

technical field [0001] The present invention relates to the technical field of encryption, and more specifically, to an off-line / on-line lattice-based attribute-based encryption method. Background technique [0002] Sahai and Waters extended the identity-based encryption scheme at the Omi Conference in 2005, and proposed an encryption scheme based on fuzzy identity, which can be regarded as ABE (ABE-Attribute Based Encryption), that is, attribute-based encryption scheme ([1 ] Amit Sahai, Brent Waters. Fuzzy Identity Based Encryption. Aarhus, Denmark: Springer Berlin Heidelberg, 457-473, 2004). In this scheme, the user identity is regarded as a series of attributes, and the user can decrypt the ciphertext if and only if the intersection of the user's key attribute set and the ciphertext attribute set is not less than the threshold set by the system. [0003] Since ABE is able to flexibly define access control policies, the ability to selectively share its encrypted data at a...

AI Technical Summary

Problems solved by technology

[0005] With the popularization of 5G networks, there are more and more scenarios of multi-user data sharing in 5G mobile networks. It is particularly important to use attribute-based encryption technology for fine-grained access to user decryption permissions. However, the increase in the transmission rate of 5G mobile networks does not mean that The encryption and decryption computing power of the mobile terminal itself will increase accordingly, and the computing power of lightweight devices is weak, and it is almost impossible to complete the complex calculation of encryption and decryption requests in a short time

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