Method and apparatus for ciphertext retrieval of numerical type data based on cloud storage

Abstract

The present invention provides a method and apparatus for ciphertext retrieval of numerical data based on cloud storage. The method includes: generating a key sequence according to the key of an OAIS data packet to be retrieved, and splitting the key sequence into a plurality of value sequence values with set lengths; translating the plaintext query sentence of the OAIS data packet to be retrieved into a corresponding ciphertext query sentence, wherein a plaintext searching condition that the user inputs is included in the plaintext query sentence, and a ciphertext searching condition obtained by the plaintext searching condition is included in the ciphertext query sentence; submitting the equivalent searching condition corresponding to the ciphertext searching condition to the cloud server to retrieve and then obtaining the retrieval result; mapping the identification of the retrieval result in the database to obtain the corresponding identification of the sequence values; extracting the corresponding identifications of all the sequence values which are larger or smaller than the mapped sequence value to obtain a identification set; obtaining the corresponding data from the cloud server according to the identification set. The invention can improve the ciphertext retrieval efficiency of the cloud storage on the basis of ensuring data security.

Description

technical field [0001] The present invention relates to cloud storage retrieval technology, in particular to a ciphertext retrieval method and device based on cloud storage numerical data. Background technique [0002] In the current major enterprise applications, project archives usually adopt the network application mode of cloud storage, which not only saves costs, but also frees enterprises from the tedious management of software and hardware maintenance and security protection. The main problem brought by cloud storage is security. Data encryption is an effective means to ensure data security in cloud storage. Usually, for a sufficiently secure encryption algorithm, after data is encrypted, the ciphertext no longer has any original Plaintext features. Therefore, ciphertext retrieval has become a key technical problem in solving cloud security storage. [0003] The retrieval methods used in data retrieval include fuzzy retrieval of character data and numerical data ret...

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Problems solved by technology

[0009] figure 2 In the workflow shown, range retrieval is almost infeasible, because after Y>p is translated into XQuery language, the obtained retrieval condition hypothesis will become Y 1 >p 1 , the encryption changes the size characteristics of the original plaintext, Y 1 >p 1 The retrieved ciphertext can only meet the requirements greater than p 1 condition, after decryption, these plaintexts do not meet the requirements greater than p, such range retrieval is completely invalid in the cloud storage structure

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