Data integrity verification method supporting key updating and third-party privacy protection

Abstract

The invention discloses a data integrity verification method supporting key updating and third-party privacy protection. The data integrity verification method comprises an initialization and data outsourcing stage, a data auditing stage and a key updating stage. On the basis that a proxy re-signature technology substitutes a traditional key updating method in an existing scheme, a storage serverutilizes a re-signature key to achieve updating of data block signature, the computation cost and the communication cost of data sources are effectively lowered, and it can be ensured that TPA cannotobtain privacy data contents of the data sources in the process of integrity verification; and thus the data integrity verification method achieves the safety purpose required by data integrity verification.

Description

Technical field [0001] The invention belongs to the technical field of cloud storage security, and relates to a data integrity verification method, and more specifically, is a method for supporting key update and data integrity verification related to cloud storage security. Background technique [0002] Nowadays, cloud storage has been widely used. In order to ensure the security of outsourcing data files from various data sources (such as laptops, smart phones, websites, etc.) to storage servers, it is necessary to design data integrity verification methods to ensure storage on remote servers. The data above has not been tampered with or lost by the attacker. [0003] At present, the amount of data generated by data sources and outsourced storage has grown exponentially. However, due to the limited computing power of data sources, the introduction of a third-party audit TPA as a verifier for integrity verification has become a common strategy for serious integrity agreements. . ...

AI Technical Summary

Problems solved by technology

(2) Unforgeability

[0005] Obviously, it is an important task to design a data integrity verification protocol that can support key update and third-party privacy protection. First, the data privacy and security issues of data sources are very important. Second, if resource-constrained data sources are outsourced A large amount of data is stored, and key renewal cannot be performed through traditional methods

The current scheme can meet the requirements (1), (2). However, the requirements (3) (4) are still widely ignored, which leads to the fact that the current data integrity verification scheme cannot be well applied in practice.

More importantly, in focusing on this research topic, we found no cryptographic primitives that can be directly applied to solve all the above problems

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