Chaos based Enigma encryption method

An encryption method and chaotic technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve the problem that Enigma encrypted ciphertexts are easy to be cracked

Inactive Publication Date: 2012-04-11
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the deficiencies in existing methods, the present invention proposes a chaos-based

Method used

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  • Chaos based Enigma encryption method
  • Chaos based Enigma encryption method
  • Chaos based Enigma encryption method

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Embodiment Construction

[0063] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0064] In this embodiment, the grayscale image is encrypted, such as Figure 4 As shown, the size of the grayscale image is 512×512, and the format is Lena.bmp, Figure 4 There are 512×512 pixels in total, and the gray value of each pixel is an integer between 0-255. Figure 4 The gray value of the middle pixel is extracted according to the principle of top-to-bottom and left-to-right to obtain a 512×512 integer array as plaintext.

[0065] The present embodiment adopts the Enigma encryption method based on chaos, comprising the following steps:

[0066] Step 1: Set initial parameters: In this embodiment, 4 mapping relationships are set to replace plaintext;

[0067] Step 1-1: Establish 4 mapping relationships y 1 = f 1 (x),y 2 = f 2 (x),y 3 = f 3 (x),y 4 = f 4 (x), mapping relationship y=f i (x) is obtained by the random function ...

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Abstract

The invention discloses a chaos based Enigma encryption method, which relates to an encryption system and is used for data and information protection. By using the method disclosed by the invention, the cyclicity problem of Enigma is improved, a cycle is expanded through chaotic mapping, and each input value mapped in the process of plain-text encryption is determined by a state value of the chaotic mapping every time, so that even in a long plain text, a periodic characteristic is difficult to occur; the distribution of passwords is better, in the Enigma encryption method disclosed by the invention, through combining with nonlinear chaotic mapping, an encryption process is completely non-linearized, so that the randomness of generated ciphertexts is better; because each ciphertext is associated with a front encrypted plain text, a slightest modification on the plain text causes a great change of the ciphertext, therefore, the method has a good avalanche effect, and can be widely applied to various mediums such as texts and images and the like; and obtained encryption results have good expressions on encryption effect and histograms thereof, adjacent pixel correlation analysis, differential attack analysis and text encryption.

Description

technical field [0001] The invention relates to an encryption system for data and information protection, in particular to a chaos-based Enigma encryption method. Background technique [0002] Encryption mechanism of Enigma: Enigma is a portable electronic mechanical device, the main structure of which is as follows: figure 1 As shown, in order to describe its encryption principle, it is simplified to only take the internal structure of six letters figure 2 ,exist figure 2 As can be seen in the figure, Enigma is mainly divided into three parts: Keyboard, Scrambler Unit and Lamp Board. The corresponding relationship between left and right of each rotor is different, and all of them can rotate counterclockwise. When encrypting, it is necessary to set the initial positions of the three rotors as the key first, and then key in the plaintext through the keyboard. After the replacement of the three rotors, the corresponding ciphertext will be displayed on the display. For th...

Claims

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Application Information

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IPC IPC(8): H04L9/00
Inventor 朱志良卜超于海刘国奇
Owner NORTHEASTERN UNIV
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