Unlimited revocable attribute-based encryption method

Abstract

The invention discloses an unlimited revocable attribute-based encryption method. The method is characterized in that an encryption system has the characteristic of no limitation, a system initialization algorithm is irrelevant to an access strategy or the quantity of attributes in an attribute set, and a generated public parameter is a constant quantity of group elements, so that the dynamic requirements of addition of new roles, entities, attributes and strategies in the system are met. In order to achieve efficient user revocation, the cryptographic system revokes in a manner that a timestamp is embedded in a ciphertext, and each unrevoked user needs to receive an additional key update material associated with the timestamp generated by a trusted authorization mechanism to generate a complete decryption key. The method can be used for a cloud-assisted Internet of Things environment, confidentiality, integrity, expandability and access control services are provided for users in the cloud-based Internet of Things environment, and meanwhile effective user revocation is supported.

Description

technical field [0001] The present invention relates to the field of information security and communication, and specifically relates to an encryption method based on an unlimited revocable attribute. This method not only realizes fine-grained access control and ensures the confidentiality of data, but also realizes the user revocation function, and has Unlimited features, the system initialization algorithm has nothing to do with the access strategy or the number of attributes in the attribute set, and can adapt to the addition of new roles, entities, attributes and strategies in the system at any time, enhancing the security and usability of the system. Background technique [0002] In recent years, the application of the Internet of Things has been widely used in different fields such as e-medicine, smart factories, and smart cities to provide services such as intelligent identification, positioning, and supervision. However, as the number of smart devices grows, more res...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the drawbacks of the prior art, the present invention provides an efficient, safe and unrestricted revocable attribute-based encryption method, which solves the problem that the traditional attribute-based encryption method cannot cope with the dynamic change of user rights, and has the feature of unlimited and can Meet the dynamic needs of the addition of new roles, entities, attributes and policies in the system