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Data processing method and device and device for data processing

A technology of data processing and arrays, applied in the computer field, can solve problems such as query efficiency is difficult to meet application scenarios

Active Publication Date: 2021-06-25
HUAKONG TSINGJIAO INFORMATION SCI BEIJING LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the Sparse Table algorithm can reduce the comparison operations on encrypted data to a certain extent, the preprocessing and query process of the Sparse Table algorithm still requires multiple comparison operations on the encrypted data. When the length of the sequence n and the number of queries m are large, Query efficiency is difficult to meet the needs of actual application scenarios

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  • Data processing method and device and device for data processing
  • Data processing method and device and device for data processing
  • Data processing method and device and device for data processing

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0030] method embodiment

[0031] refer to figure 1 , shows a flow chart of the steps of an embodiment of a data processing method of the present invention, the method is applied to a multi-party secure computing system, and the method is used for the ciphertext sequence L=[L 1 , L 2 ,...,L n ], when the subscript pair (a,b) is received, return the target interval sequence [L in the ciphertext sequence L a ,...,L b ], the method specifically may i...

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Abstract

The embodiment of the invention provides a data processing method and device and a device for data processing. The method comprises the steps: constructing a matrix M based on a ciphertext sequence L = [L1, L2,..., Ln], wherein the matrix M includes log2n rows and (n-1) colums, the element Mi,j in the ith row and the jth column represents the extreme value of the ith item to the (i + 2j-1) th item in the ciphertext sequence L; determining an integer k according to the subscript pair (a, b), k satisfying 2k-1 < = b-a < 2k; obtaining a first interval extreme value and a second interval extreme value by querying the matrix M, wherein the first interval extreme value is an element Mk, a of the matrix M, and the second interval extreme value is an element of the matrix M; and based on a ciphertext, carrying out vectorization comparison on the first interval extreme value and the second interval extreme value to obtain an extreme value of a target interval sequence [La,..., Lb]. According to the embodiment of the invention, the interval extreme value query efficiency can be improved.

Description

technical field [0001] The present invention relates to the field of computer technology, in particular to a data processing method, device and device for data processing. Background technique [0002] MPC (Secure Muti-Party Computation) is an algorithm for protecting data privacy and security. Under the premise of not leaking their own data, multiple participants can use multi-party secure computing technology to perform collaborative calculations and obtain calculation results. [0003] RMQ (Range Minimum / Maximum Query, find the maximum value of the interval) query refers to a given sequence L of length n 1 , L 2 ,...,L n , it is required to support several query operations. Input a pair of subscripts (i,j) for each query operation, and return the sequence L i , L i+1 ,...,L j The minimum (or maximum) value in . Each minimum (maximum) query requires at least O(n) comparisons, and a total of O(mn) comparisons are required for m queries. [0004] In a multi-party se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/62G06F21/60
CPCG06F21/602G06F21/6245
Inventor 何昊青王国赛贾晓丰高嵩
Owner HUAKONG TSINGJIAO INFORMATION SCI BEIJING LTD