Efficient data encryption, updating and access control method for cloud storage

Abstract

The invention discloses an efficient data encryption, updating and access control method for cloud storage, which belongs to the technical field of network information safety and computer software. The method can realize quick block encryption replacement for plaintext data, so that data confidentiality is guaranteed while abuse of user data by a cloud server can be prevented. The method can realize efficient updating for ciphertext data without re-encrypting and uploading a whole data file, so that system transmission and storage efficiency is improved. The method can realize dual permission control for the data file, ciphertext access rights are formulated by data owners but executed by the cloud server, and secret key materials for decrypting ciphertexts are controlled by the data owners, so that data file control is enhanced, and permission revocation can be flexibly realized. Encryption of the plaintext data and processing of the ciphertext data can be realized by the method at low cost, duel replacement for the plaintext data enables a data applicant to obtain completely different ciphertext results in each time of application and prevents the cloud server from abusing the user data, accordingly data confidentiality is further enhanced, and the method has bright application prospect in data cloud storage.

Description

technical field [0001] The invention relates to an efficient data encryption, update and access control method for cloud storage, which can be used to directly update and access control ciphertext data stored on a cloud server, and belongs to the technical fields of network information security and computer software. Background technique [0002] With the advent of the information age, how to realize the safe storage of massive data has become an important problem to be solved urgently. The emergence of cloud storage technology provides a good opportunity to solve this problem. The use of cloud storage can reduce the storage cost of enterprises, avoid security risks such as data loss and damage, and improve data management efficiency and utilization. The next important growth point has huge market prospects. However, the remote off-site storage of data also leads to difficult security issues involving confidentiality, encrypted data update, and authority control. [0003] ...

AI Technical Summary

Problems solved by technology

One of the main problems of this type of method is that it cannot solve the permission revocation, so it is necessary to add time constraints to the authorization or introduce a third-party trusted organization to realize authorization management. There are still many problems to be solved

[0006] To sum up, the remote off-site storage of plaintext data in cloud storage services requires the data encryption method to take into account both confidentiality and operability, and distrust of third-party storage service providers also makes ciphertext data update and data access control face challenges. It is very difficult, so it is necessary to propose an efficient method that can solve the above problems

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