Output-cryptograph mixed feedback chaos stream cipher encrypting and decrypting method

An output feedback, encryption and decryption technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve the problems of complex mapping form, affecting the system implementation cost and system speed, etc., to achieve strong flexibility, simple form, and good confidentiality. Effect

Inactive Publication Date: 2006-05-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The digital implementation of these systems requires the use of floating-point arithmetic and complex mapping forms
Affects the implementation cost of the system and the speed of the system

Method used

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  • Output-cryptograph mixed feedback chaos stream cipher encrypting and decrypting method
  • Output-cryptograph mixed feedback chaos stream cipher encrypting and decrypting method
  • Output-cryptograph mixed feedback chaos stream cipher encrypting and decrypting method

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Experimental program
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Effect test

Embodiment Construction

[0026] Such as figure 1 As shown, the specific steps of the encryption process are:

[0027] The internal state x(t) of the key stream generator passes through the chaotic signal generator and generates chaotic signal u(t) after multiple chaotic iterations. The mathematical expression is expressed as:

[0028] u(t)=U(x(t))=F z (x(t));

[0029] The chaotic signal u(t) passes through the separation link and is separated according to the even bits and odd bits to generate the output feedback signal e(t) and the signal o(t) used for key stream generation. The mathematical expression is expressed as:

[0030] e ( t ) = H ( u ( t ) ) = Σ j = 1 r u 2 ...

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Abstract

This invention discloses one output key message mixture feedback chaotic flow code decoding method, which multiple overlap one section number parameter section linear chaotic mapping signals to generate Key flow. After merging with chaotic odd bit to generate key code flow, couple bit and message merge as back feedback to keys generator to overcome the limit accuracy effect through sequence. The invention has the following technique effects : a, good security saving without stealer to get enough chaotic track information and to output key message mixture key codes system to resist each attack method; b, simple type to realize system by set formula; c, good flexibility to adjust code speed.

Description

technical field [0001] The invention relates to an encryption and decryption method of an output-ciphertext mixed feedback chaotic flow cipher. Background technique [0002] Chaotic systems have some characteristics that are closely related to cryptography, such as sensitivity to initial conditions and control parameters, ergodicity, mixing, and so on. Chaotic cryptography has been listed as an important research frontier of modern cryptography. A large number of chaotic encryption schemes are continuously proposed, but research shows that many of them are not secure enough. Since chaotic systems are deterministic, some tools in chaos theory can be used to identify chaotic systems. Some analytical methods for attacking chaotic systems through chaotic orbital information have been proposed. Based on these methods, once the intruder obtains enough information of the chaotic orbit, it is possible to use this information to reduce the complexity of obtaining the key of the ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/00
Inventor 沈海斌严晓浪
Owner ZHEJIANG UNIV
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