Safe and efficient ciphertext retrieval method and vehicle-mounted system based on the Internet of Vehicles cloud system

Abstract

The invention belongs to the technical field of transmission control procedures, and discloses a safe and efficient ciphertext retrieval method and a vehicle-mounted system based on the Internet of Vehicles cloud system. The data owner extracts keywords from the file, and uses a sorting algorithm to calculate the weight of the keywords. value and hash value, and generate a file identifier and file header for each file, and send it to the super node; the data owner encrypts the file and uploads it to the cloud server for storage; The structure is constructed and updated; when the searcher performs keyword search, the super node searches the index structure according to the received keyword hash value, and sends the associated file ID, user ID and file header submitted by the searcher to To the cloud service provider; the cloud service provider compares the file header submitted by the searcher with the file header stored on the cloud, and sends the corresponding ciphertext to the searcher with access rights. The invention has strong security and high retrieval efficiency.

Description

technical field [0001] The invention belongs to the technical field of transmission control procedures, and in particular relates to a safe and efficient ciphertext retrieval method and a vehicle-mounted system based on a car-linked cloud system. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: as in-vehicle devices become more and more intelligent, in-vehicle information services, as the main means of obtaining information, are far from meeting the needs of passengers. The powerful computing and storage capabilities of cloud computing, the convenience of network access control and many other advantages can effectively solve the limitations of existing vehicle information services. The emergence of the Internet of Vehicles cloud system combines cloud computing and VANETs (vehicle ad hoc networks). However, in terms of information retrieval and data sharing, high-density vehicle node distribution and high-speed...

AI Technical Summary

Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: the retrieval efficiency is low. On the one hand, because most of the retrieval processes for the index structure are linear at the present stage, the efficiency of the retrieval scheme is still low. Update and iterate the index structure in a timely manner in an environment with highly dynamic data changes; on the other hand, existing solutions store all ciphertexts and index structures in the cloud, and all keywords need to be uploaded to the cloud when searching, and the cloud server needs Retrieve the index structure in the cloud, and then return the result to the vehicle system. The distance between the cloud and the ground will also reduce the retrieval efficiency; in addition, the high-speed movement of the vehicle during the data upload and download process may Cause data packet loss and delay, etc., causing great hidden dangers to data security;

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