Security publishing and subscribing system and publishing and subscribing method based on block chain technology

Abstract

The embodiment of the invention provides a secure publishing and subscribing system and method based on a block chain technology. The system comprises a key server, a message subscribing client, a message publishing server and a block chain comprising a plurality of block chain nodes, the method comprises the following steps: receiving a ciphertext and an encryption tag sent by a message publishing server; receiving an attribute value, a trap door value and a pre-decryption key sent by the subscription client; verifying whether the ciphertext is matched with the attribute value or not; if yes,verifying whether the encryption tag is matched with the trap door value or not; if so, pre-decrypting the ciphertext by using the pre-decryption key to obtain a pre-decrypted ciphertext; and sendingthe pre-decrypted ciphertext to the message subscription client, so that the message subscription client decrypts to obtain a subscription message. According to the embodiment of the invention, the security of the stored data in the publishing and subscribing system can be improved.

Description

technical field [0001] The invention relates to the technical field of the Internet of Things, in particular to a secure publish-subscribe system and publish-subscribe method based on blockchain technology. Background technique [0002] The publish-subscribe system is a middleware system, which has the characteristics of asynchronous transmission, multi-party communication, and loose coupling. It can completely decouple the two parties in communication in terms of time, space, and control flow, while entities are in a loose manner. Data transmission, at the same time, the message publisher and the subscriber do not know each other's existence. Subscribers only need to submit their interested requests to the middleware. As long as a publisher publishes a message to the middleware, the middleware can send the message to all interested subscribers. [0003] Benefiting from the development of wireless sensing technology, the Internet of Things has achieved considerable developm...

AI Technical Summary

Problems solved by technology

[0004] However, it is precisely because of the decoupling characteristics of the publish-subscribe system that attacks against the data stored in the system emerge in endlessly, that is to say, the security of the data stored in the existing publish-subscribe system still needs to be improved

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