Image ciphering, deciphering method and device
An encryption method and image technology, applied in the field of image decryption and decryption, can solve problems such as low security and encryption cracking
Inactive Publication Date: 2010-12-08
HUAWEI TECH CO LTD +1
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Problems solved by technology
[0004] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the coefficients embedded in the watermark and encrypted in the above method are respectively fixed as the AC coefficient and the DC coefficient in the coefficient matrix, that is, the encrypted area is fixed, and the encryption is easy. Cracked by an attacker, the security is not high
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[0044] An image processing method in the embodiment of the present invention is described in detail below, see figure 1 , methods include:
[0045] 101. Obtain the low frequency coefficient of the image
[0046] In this example, a three-level wavelet transform is performed on the image waiting to be sent, and the low-frequency coefficient {a 1 , a 2 , a 3 , a 4 , a 5 , a 6 ......a n}.
[0047] 102. Divide the low-frequency coefficients into at least two groups of coefficients:
[0048] The low-frequency coefficients are divided into at least two groups of coefficients according to certain rules, such as figure 2 As shown, the steps include:
[0049] 201. Randomly generate binary numbers through keys
[0050] In this example, the key randomly generates binary numbers with the same number of low-frequency coefficients as
[0051] 202. Compare the low frequency coefficient with the binary number
[0052] In this example, the low-frequency coefficients are compare...
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The embodiment of the invention discloses an image encryption method, which comprises the following steps: low-frequency coefficients of an image are obtained; the low-frequency coefficients are divided into at least two groups of coefficients; at least a group of coefficients are selected from at least two groups of coefficients, and the encryption of at least one group of selected coefficients is carried out. The embodiment of the invention further discloses an image decryption method, which comprises the following steps: the encrypted image is received; the low-frequency coefficients of the image are obtained; the low-frequency coefficients are divided into at least two groups of coefficients; at least one group of coefficients are selected from at least two groups of coefficients, andthe decryption of the selected at least one group of coefficients is carried out. The proposal can overcome the problem of poor confidentiality caused by fixed and open encrypted coefficients in the prior art by dividing the low-frequency coefficients of the image into at least two groups and selecting at least one group of coefficients for carrying out the encryption. The embodiment of the invention further correspondingly discloses an image encryption device and an image decryption device.
Description
technical field [0001] The present invention relates to the technical field of image multimedia, in particular to image decryption, a method and a device for decrypting. Background technique [0002] With the rapid transmission and wide use of images in the network. Users have put forward higher requirements for copyright authentication and secure transmission of image information. For the authentication of image copyright, digital watermarking technology can be used to hide copyright information in the image to achieve the purpose of identifying the ownership of the work and tracking the source of illegal infringement; for the safe transmission of image information, image encryption technology can be used to hide the identity of the image itself. Authentic information to ensure the safe transmission of information in the channel. [0003] In order to meet the requirements of copyright authentication and secure transmission of image information, a method of jointly protect...
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IPC IPC(8): H04N7/24G06T1/00
Inventor 李伟黄继武刘红梅张永平郝韬
Owner HUAWEI TECH CO LTD