Color image lossless encryption method on basis of two-dimensional discrete wavelet transform and spatiotemporal chaos
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A two-dimensional discrete wavelet, spatiotemporal chaotic technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as weak security, complex data format and representation, and perception degradation.
Active Publication Date: 2015-06-03
HENAN UNIVERSITY
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Problems solved by technology
Color images contain more information than grayscale images, and the data format and representation are more complex
Therefore, the encryption method for grayscale images cannot be directly extended to the encryption of color images.
In addition, these algorithms also have problems such as weak security, perception degradation, and information loss.
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Embodiment 1
[0068] Embodiment one, see figure 1 As shown, a color image lossless encryption method based on two-dimensional discrete wavelet transform and space-time chaos includes the following steps:
[0069] Step 1. Input a color plaintext image I of size W×H 0 , separating the image I 0 The three primary color components of R, G, and B, get a component matrix IR with a size of W×H 0 , IG 0 and IB 0 ;
[0070] Step 2. Utilize the external key Key, and according to the plaintext image I 0 , to generate the system parameters and initial values of the one-way coupling map grid, and perform iterative operations on the space-time chaotic system to obtain the key stream K 1 and K 2 ;
[0071] Step 3. To the component matrix IR 0 , IG 0 and IB 0 Carry out two-dimensional discrete wavelet transform respectively to obtain subband groups with size m×n: {LL11, LH11, HL11, HH11}, {LL21, LH21, HL21, HH21} and {LL31, LH31, HL31, HH31}, each The subband group includes a low frequency su...
Embodiment 2
[0077] Embodiment 2 is basically the same as Embodiment 1, the difference is that in step 2, the iterative operation of the space-time chaotic system is performed using the following steps to obtain the key stream K 1 and K 2 :
[0078] Step 2.1. Set the length of the external key Key to 320 bits, and divide it into 40 blocks equally, that is, Key=B 1 B 2 B 3 …B 40 , according to the one-way coupled mapping lattice x n + 1 ( i ) = ( 1 - a ) [ 1 - ϵ x n 2 ( i ) ] + a [ 2 - ϵ x n 2 ( i ...
Embodiment 3
[0091] The third embodiment is basically the same as the second embodiment, the difference is: the system parameters a and ε and the initial value x in the step 2.1 k (0)(k=1,2,...,6) is calculated using the following formula:
[0092] x 1 ( 0 ) = mod ( ( B 1 ⊕ B 2 ⊕ B 3 ⊕ B 4 ⊕ B 5 + Σ i = 1 W / 2 Σ ...
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Abstract
The invention relates to a color image lossless encryption method on the basis of two-dimensional discrete wavelet transform and spatiotemporal chaos. The color image lossless encryption method comprises the following steps: separating three primary color components of a color plaintext image to obtain matrices IR0, IG0 and IB0; by utilizing an external key and combining the plaintext image, generating spatiotemporal chaos system parameters and initial values and carrying out iterative operation on a spatiotemporal chaos system to obtain key streams K1 and K2; carrying out two-dimensional discrete wavelet transform on the components IR0, IG0 and IB0 to obtain three groups of sub-bands; utilizing the key stream K1 to respectively carry out disorder processing on the three groups of sub-bands and compressing the sub-bands; respectively carrying out two-dimensional discrete wavelet transform on each group of processed sub-bands to obtain a wavelet encrypted image I1; utilizing the key stream K2 to carry out diffusion treatment on the image I1 to obtain a final ciphertext image C. Compared with an existing image encryption method, the color image lossless encryption method provided by the invention has the advantages of high safety, good encryption effect, lossless information, high encryption speed, high attack resistance and the like and can be widely applied to the fields of medicine, biological gene, military and the like.
Description
technical field [0001] The invention relates to the field of image encryption, in particular to a color image lossless encryption method based on two-dimensional discrete wavelet transform and space-time chaos. Background technique [0002] Nowadays, a large number of digital images are easily disseminated on the computer network. How to protect image information from illegal copying, forgery, tampering, and illegal access has become a hot spot in the field of information security. Due to the characteristics of large amount of data and strong correlation between adjacent pixels in digital images, when traditional encryption algorithms such as DES, AES, RSA, etc. are used for image encryption, there are generally problems such as low encryption efficiency and weak security. The study found that the excellent characteristics of the chaotic system itself are very suitable for information encryption, so the digital image encryption technology based on chaos theory has attracted ...
Claims
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