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Homomorphic encryption algorithm-based individual image safe retrieving method

A homomorphic encryption and image technology, which is applied in the field of image processing, can solve the problems of complex image feature calculation process and low retrieval accuracy, and achieve the effects of simplifying image feature calculation, protecting image features, and overcoming the large computational time complexity

Active Publication Date: 2018-08-17
XIDIAN UNIV
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of complex image feature calculation process and low retrieval accuracy in the existing security retrieval technology, and propose a personal image security retrieval method based on homomorphic encryption algorithm

Method used

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  • Homomorphic encryption algorithm-based individual image safe retrieving method
  • Homomorphic encryption algorithm-based individual image safe retrieving method
  • Homomorphic encryption algorithm-based individual image safe retrieving method

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Experimental program
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Embodiment Construction

[0040] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0041] Refer to attached figure 1 , further describe in detail the steps realized by the present invention.

[0042] Step 1, build the Paillier encryption system.

[0043] The user randomly selects two large prime numbers p and q according to the encryption parameter z of the homomorphic encryption algorithm, where z≥2 9 , p≥2 z ,q≥2 z , the user calculates the least common multiple λ of p-1 and q-1, uses the value of λ as the private key of the encryption algorithm, calculates the product N of p and q, and uses N as the first public key of the encryption algorithm.

[0044] According to the following formula, select the second public key g:

[0045]

[0046] Among them, gcd represents the operation of finding the greatest common factor, and g represents the set {0,1,2,...N 2 -1}, mod means modulo operation.

[0047] Step 2, encrypt personal images....

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Abstract

The invention discloses a homomorphic encryption algorithm-based individual image safe retrieving method. The method comprises specific steps of 1. building a Paillier encryption system; 2. encryptingan individual image; 3. pre-treating the encrypted individual image by a server; 4. performing angle integration on the encrypted individual image; 5. extracting a wavelet moment characteristic of the encrypted individual image; 6. calculating a characteristic distance; and 7. Returning a retrieval result. According to the homomorphic encryption algorithm-based individual image safe retrieving method, the individual image is descripted comprehensively by using the image wavelet moment characteristic, the individual image characteristic is calculated less complexly, and the retrieving efficiency is improved. The whole retrieval process is performed in a ciphertext domain, and the individual image is retrieved safely while user retrieval information and data are not disclosed.

Description

technical field [0001] The invention belongs to the field of image processing, and further relates to an image security retrieval method based on a homomorphic encryption algorithm in the technical field of image processing. The invention is applicable to the image retrieval in the personal image database. The user stores the encrypted personal image in the third-party server to form the image database, implements safe retrieval of the personal image database, and hides the user's retrieval information and stored data. Background technique [0002] With the development of storage technology, people store a large number of personal images in third-party servers, but the existing storage measures cannot provide personal image data protection for users because they are stored in plain text. Further, encryption of user information during retrieval cannot be ensured. In order to protect the user's personal image from being leaked during the storage and retrieval process, general...

Claims

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Application Information

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IPC IPC(8): H04N1/32
Inventor 张磊吕锡香
Owner XIDIAN UNIV
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