Double-image encryption method based on interference and logic mapping
A technology of logical mapping and encryption method, which is applied in the field of dual image encryption based on interference and logical mapping, and can solve the problem of non-linear low-plaintext images in image encryption
Active Publication Date: 2019-10-22
厦门强云网络科技有限公司
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Problems solved by technology
[0005] The purpose of the present invention is to provide a dual-image encryption method based on interference and logical mapping, which solves the problem of low nonlinear image encryption and the outline of the plaintext image in the interference method existing in the prior art
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0158] Embodiment 1, using a random phase mask instead of the master key exp(jM 1 ’(x,y)), the decryption result is as follows Figure 7(a)-Figure 7(b) shown.
Embodiment 2
[0159] Embodiment 2, using a random phase mask instead of the master key exp(jM 2 (x,y)), the decryption result is as Figure 8(a)-Figure 8(b) shown.
[0160] From Figure 7(a)-Figure 7(b) and Figure 8(a)-Figure 8(b) No information about the plaintext image can be seen.
[0161] Other key security tests:
[0162] (1) Using the wrong wavelength
Embodiment 3
[0163] Embodiment 3, when the wavelength λ increases by 10nm, the decryption result is as follows Figure 9(a)-Figure 9(b) As shown, the correlation coefficients are 0.0833 and 0.0864, respectively.
[0164] (2) Using the wrong axial distance
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The invention discloses a double-image encryption method based on interference and logic mapping. The double-image encryption method includes the steps: splicing an image O1 (mu, upsilon) and an imageO2 (mu, upsilon) into an image Oe (mu, upsilon); generating a sequence S1, a sequence S2 and a sequence S3 based on logic mapping; scrambling the image Oe (mu, upsilon) by using the sequence S1; obtaining an image Oe '(mu, upsilon); decomposing the image Oe '(mu, upsilon) into an image O1' (mu, upsilon) and an image O2 '(mu, upsilon); calculating a pure phase mask exp (jM1 (x, y)) and a pure phase mask exp (jM2 (x, y)) in the image O1 '(mu, upsilon); scrambling the pure phase mask exp (jM1 (x, y)) by using the sequence S2 to obtain a mask exp (jM1 '(x, y)); and scrambling the pure phase maskexp (jM2 (x, y)) by using the sequence S3 to obtain a mask exp (jM2 '(x, y)), and carrying out inverse free space wave propagation on the image O2' (mu, upsilon) twice to obtain a ciphertext image V (xi, eta). The double-image encryption method can improve nonlinearity of an encryption system, and can improve safety.
Description
technical field [0001] The invention belongs to the technical field of image encryption methods, and relates to a double image encryption method based on interference and logical mapping. Background technique [0002] Image is an important carrier of information, and its security during transmission is particularly important, so the research on image encryption is of great significance. [0003] In recent years, optical methods have been widely used in information security due to their advantages of parallel processing and high speed. The dual random phase encoding method proposed by Refregier Philippe and Javidi Bahram in 1995 can encrypt images into ciphertext with static white noise. Traditional dual random phase encoding methods are vulnerable to different types of attacks due to their inherent linearity. In recent years, it has been developed to Fresnel transform domain, fractional Fourier domain and gyrator transform domain. Yuan Lin et al. proposed a method for dua...
Claims
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CPCH04N1/44
Inventor 隋连升赵小宇杜聪张笑
Owner 厦门强云网络科技有限公司