Efficient cloud storage replica proof method, system and application supporting public verification

Abstract

The invention belongs to the technical field of cloud storage security, and discloses an efficient cloud storage copy certification method, system and application supporting public verification, generating a corresponding copy packaging key according to a key generation protocol; generating a corresponding copy according to an IAE packaging algorithm ; According to the IAE decapsulation algorithm, restore the corresponding file. Under the random oracle model, it is proved that the existing encrypted storage scheme (i.e. the PRI-POREP scheme) is not safe for the chosen message attack, and it is proved that the μPRI-POREP of the present invention can initiate a chosen message attack in the random oracle model as a whole The opponent is safe. Compared with the multi-round encoding of the existing scheme (PRI-POREP), the replica encoding algorithm of the present invention can complete the encapsulation in only one round, which greatly improves the encoding efficiency of the replica. Additionally, the invention shows how the system of the invention can be extended to support efficient dynamic updates, ie to support block-level file updates.

Description

technical field [0001] The invention belongs to the technical field of cloud storage security, and in particular relates to an efficient cloud storage copy proof method, system and application supporting public verification. Background technique [0002] Present: Cloud storage services offer individuals and businesses a cost-effective, high service availability, and on-demand scaling alternative to outsourcing data without costly upfront investments. However, the potential for dishonest storage service providers, internal / external attackers, and many other malicious actions makes outsourcing files a serious security risk. Among them, secure proof of storage is a key aspect. Over the past decade, various proof-of-storage solutions have been devised to meet customers' need to verify outsourced data integrity / retrievability, such as Provable Data Possession (PDP) [Ateniese, et al.: Provable datapossession at untrusted stores, CCS 2007.] and Proofs of Retrievability (POR) [Sha...

AI Technical Summary

Problems solved by technology

[0004] (1) In the existing copy storage proof scheme PRI-POREP, there is a chosen message attack

[0005] (2) In the existing copy storage proof scheme PRI-POREP, the practicability is poor, and the calculation overhead of storing the copy is huge. For example, if it is assumed that the complete exponentiation operation of a 1024-bit RSA module takes 1 millisecond, then provided in 1MB The RSA decryption operation on the file takes about 8.2 seconds

So it takes the client about 2.18 years to make a copy of a 1MB file, which is very inefficient for a practical cloud storage system

[0006] (3) In the existing copy storage proof scheme PRI-POREP, efficient dynamic updates are not supported, and to update files, all copies need to be downloaded

Therefore, the computational cost is proportional to the file size and the number of copies, and the overhead is large

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