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An image encryption method and device, and an image decryption method and device

An encryption method and encryption device technology, applied in computer security devices, instruments, calculations, etc., can solve problems such as consumption, encrypted data volume expansion, and large storage space, so as to enhance encryption effects, reduce storage requirements, and avoid extreme expansion. Effect

Active Publication Date: 2022-08-09
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this data encryption scheme will cause a sharp increase in the amount of encrypted data, causing the cloud server to consume a large amount of additional storage space, which is contrary to the cloud's desire to reduce the storage burden.

Method used

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  • An image encryption method and device, and an image decryption method and device
  • An image encryption method and device, and an image decryption method and device
  • An image encryption method and device, and an image decryption method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] like figure 1 As shown, the embodiment of the present invention is an image encryption method. Different from text data, image data has particularity: a single pixel value usually does not have clear semantics. model. Therefore, it is not necessary to perform high-intensity homomorphic encryption on each pixel. It is only necessary to introduce randomness between adjacent pixels to disrupt the original pattern and make it unrecognizable, so as to achieve the purpose of encryption.

[0043] An image encryption method according to an embodiment of the present invention includes:

[0044] Based on the encryption key, a first random sequence and a second random sequence are generated; the second random sequence is a binary sequence used to indicate the reciprocal sequence element in the first random sequence;

[0045] generating a third random sequence according to the first random sequence and the second random sequence;

[0046] According to the third random sequence, ...

Embodiment 2

[0063] like figure 2 As shown, the present invention implements an image encryption method, including:

[0064] Based on the encryption key, a first random sequence and a second random sequence are generated; the second random sequence is a binary sequence used to indicate the reciprocal sequence element in the first random sequence;

[0065] generating a third random sequence according to the first random sequence and the second random sequence;

[0066] According to the third random sequence, random base conversion is performed to decrypt the encrypted image data.

[0067] Preferably, performing random binary conversion according to the third random sequence to decrypt the encrypted image data, including:

[0068] (1) Split the encrypted image data, and obtain the i-th element from the lowest position to the highest position of the encrypted image data;

[0069] (2) Perform decryption to restore the first image data according to the following formula.

[0070]

[007...

Embodiment 3

[0084] The present invention implements an image encryption device, comprising:

[0085] The first and second sequence generation modules, based on the encryption key, generate a first random sequence and a second random sequence; the second random sequence is a binary sequence, and is used to indicate the reciprocal sequence element in the first random sequence;

[0086] a third sequence generation module, which generates a third random sequence according to the first random sequence and the second random sequence;

[0087] The image encryption module performs random binary conversion according to the third random sequence, and encrypts the input first image data.

[0088] The present invention implements an image decryption device, comprising:

[0089] The first and second sequence generation modules, based on the encryption key, generate a first random sequence and a second random sequence; the second random sequence is a binary sequence, and is used to indicate the recipr...

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PUM

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Abstract

The invention provides an image encryption and correction method and device, and an image decryption method and device, belonging to the technical field of image encryption. Based on the encryption key, a first random sequence and a second random sequence are generated; the second random sequence is a binary sequence, and is used to indicate the reciprocal sequence element in the first random sequence; according to the first random sequence, the second random sequence A second random sequence is used to generate a third random sequence; according to the third random sequence, random base conversion is performed to encrypt the input first image data, so that the constant base number is re-expressed by random base, avoiding the need for The extreme expansion of the data volume of the image after encryption reduces the storage requirements of the cloud server and the calculation load of the encrypted domain processing; the present invention is based on the second random sequence used to indicate the reciprocal sequence element in the first random sequence and the first random sequence A random sequence is used to generate a third random sequence, which makes the encryption result more random and enhances the encryption effect.

Description

technical field [0001] The present application relates to the technical field of image encryption, and in particular, to an image encryption method and device, and an image decryption method and device. Background technique [0002] In a cloud storage environment, users and the cloud have different needs. Users want their data privacy to be protected, and the cloud wants to be able to perform certain processing on user data, such as data compression and retrieval, to more effectively save storage space and shorten response time. Users can encrypt data to protect data privacy, while the cloud needs to process the encrypted data without decrypting it, which promotes the development of signal processing in the encryption domain and has received extensive attention. [0003] Graig Centry proposed a homomorphic encryption scheme in the paper "A fully homomorphic encryption scheme", which is used to encrypt generalized data, which can perform various operations on the encrypted d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F21/60
CPCG06F21/602G06F21/60
Inventor 杨建权常杰王员根钱静朱国普
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI