Virtual optical encryption method based on chaotic mapping

A technology of chaotic mapping and encryption method, applied in the field of information security, can solve the problems of lack of systematic research on mathematical foundation

Inactive Publication Date: 2012-09-12
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, compared with encryption systems based on mathematical theory, the mathematical basis of virtual optical encryption systems lacks systematic research, such as security analysis, characteristics and generatio

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  • Virtual optical encryption method based on chaotic mapping
  • Virtual optical encryption method based on chaotic mapping
  • Virtual optical encryption method based on chaotic mapping

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Embodiment Construction

[0041] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0042] like figure 1 As shown, it is a virtual optical encryption system, where the information plane U 0 is the plaintext, and the image plane is the encrypted ciphertext U c , λ is the wavelength, f is the focal length of the lens, d 0 is the distance from the information plane to the front surface of the imaging lens, d i is the distance from the rear surface of the lens to the image plane, d d 1 +d 2 , d 1 is the distance from the random template to the beam splitter, d 2 Be the distance from the lens to the beam splitter, d represents the distance from the two-dimensional space-time chaotic sequence to the front surface of the lens; the key is Θ=(U m , d 0 , d, λ, f), where U m is a random template, which will be generated by the following method.

[0043] For the selected parameters (init, w, α), generate a two-dimensional space-tim...

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Abstract

The invention discloses a virtual optical encryption method based on chaotic mapping and belongs to the field of information security technology and non-mathematical encryption and decryption technology. Random templates of key parameters are generated through spatial-temporal chaotic mapping, system security is enhanced and an information encryption method based on a virtual optical system is formed. Aiming at the most important problem in a virtual optical encryption system, namely, generation of the random templates, the method is based on the spatial-temporal chaotic mapping and the random templates with fine statistical performance are generated. Combining the random templates with other key parameters in the virtual optical encryption system, an encrypted ciphertext is obtained by calculating discrete Fresnel transform of a plaintext and the random templates and discretion of complex amplitude transmittance function of a lens. A decrypted plaintext is obtained by calculating reverse Fresnel transform.

Description

technical field [0001] The invention relates to a virtual optical encryption method based on space-time chaotic mapping, belonging to the technical field of information security. Background technique [0002] The traditional encryption mechanism is based on mathematical theory, and the virtual optical encryption mechanism based on optical imaging system uses the principle of optical imaging to realize the optical encryption process by computer programming method, and takes the propagation law in the optical process and the geometric parameters of the structure as the Key to achieve high-level data encryption and information hiding. Due to the particularity of the optical imaging system, light waves are a multi-dimensional information carrier with multiple attributes such as amplitude, phase, wavelength, and polarization. At the same time, the addition of elements such as random templates in the virtual optical encryption system makes the key space more complex. It is broad ...

Claims

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Application Information

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IPC IPC(8): H04L9/00
Inventor 杨庚徐宁陈蕾徐小龙杨晓玲朱薇
Owner NANJING UNIV OF POSTS & TELECOMM
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