Crowd intellectual sensing truth value discovering method protecting privacy
A crowd-sensing, privacy-protecting technology, applied in the field of cloud computing and big data privacy protection, can solve the problems of complex computing and high overhead, and achieve the effect of simple implementation process, low overall overhead, and improved security.
Inactive Publication Date: 2018-09-04
ANHUI UNIVERSITY
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Problems solved by technology
[0007] The purpose of the present invention is to provide a method for discovering the true value of crowd sensing that protects user privacy, so as to solve the problems of complex calculations and high overhead in the traditional privacy-protecting crowd sensing truth discovery method
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[0027] The implementation process of step S10 is as follows:
[0028] Assuming that the system includes K users and 1 cloud server, the trusted third party TA generates Kc arbitrary and different secret values s for K users 1 ,...,s Kc , And then randomly distribute these secret values to K users, each user U k Get a set of secret values S k , TA uses this group to generate a private key for each user Among them, TA generates a private key for the cloud server
[0029]
[0030] among them, Δ is the maximum value of data uploaded by all users, S represents the set of all secret values, t represents the initial time of generating the secret key, and λ is a security parameter, Is a hash function, f is a pseudo-random function cluster determined from the keyword s A pseudo-random function randomly selected in, mod represents modulo operation.
[0031] Explain here p k And p 0 Meaning: p k Represents the sum of the pseudo-random function value generated by the kth user with its...
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The invention discloses a crowd intellectual sensing truth value discovering method protecting privacy. The method comprises the following steps that (1) a trusted third-party TA allocates private keys to a cloud server and users; (2) the cloud server generates an initial truth value at first, each user encrypts a difference between an observation value of the user and the initial truth value andthen transmits the encrypted difference to the cloud server, the cloud server calculates the sum of difference information sent by the users through security summation, and the users separately updateweights according to the sum; (3) each user encrypts the weight of the user and a product of the weight and the observation value and then sends the encrypted weight and product to the cloud server,and the cloud server calculates the sum of weights and the sum of products of the weights and observation values through security summation again, so as to update the truth value; and (4) the above steps are repeated till a convergence standard is met, and then the truth value is output. The method adopts a symmetric encryption-based security summation method, reduces calculation overhead, and protects the privacy of the user in discovery of the truth value.
Description
Technical field [0001] The invention relates to the field of cloud computing and big data privacy protection, in particular to a group intelligence perception truth value discovery method for protecting user privacy. Background technique [0002] With the development of science and technology, more and more mobile devices use sensors, which makes it possible to mine real information by gathering the perception data of each sensor, and the group intelligence perception truth value discovery system was born. [0003] Because the quality of each sensor and the surrounding noise are different, the perception data uploaded by each user is different from the true value. Therefore, a certain algorithm is required to obtain the most likely true value from a large amount of data. [0004] The mobile group intelligence perception truth value discovery system uses the sensors carried by the user's mobile device to collect the perception data of the user's environment, and then uploads these dat...
Claims
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Login to View More IPC IPC(8): H04L29/06H04L29/08H04L9/08
CPCH04L9/0833H04L63/0435H04L63/065H04L67/10
Inventor 田苗苗陆雪孙洪山吴佩敏徐嵘程孝泗
Owner ANHUI UNIVERSITY