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Blind recognition method for self-synchronization scrambling code generation polynomial

A technology of generating polynomial and self-synchronization, which is applied in the direction of interference to communication, encryption device with shift register/memory, digital transmission system, etc., to achieve the effect of fast recognition speed, simple algorithm and broad application prospects

Inactive Publication Date: 2011-09-28
36TH RES INST OF CETC
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Problems solved by technology

[0014] This attack method is based on the correlation between the combination function and its variables and the 0, 1 imbalance of the source. It can be used to analyze the generator polynomial of the LFSR with the initial state, but this method cannot be used to analyze The self-synchronizing connected LFSR generator polynomial

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  • Blind recognition method for self-synchronization scrambling code generation polynomial
  • Blind recognition method for self-synchronization scrambling code generation polynomial
  • Blind recognition method for self-synchronization scrambling code generation polynomial

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Embodiment Construction

[0029] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments. These examples should be understood as only for illustrating the present invention but not for limiting the protection scope of the present invention. After reading the contents of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent changes and modifications also fall within the scope defined by the claims of the present invention.

[0030] Such as figure 2 As shown, the self-synchronizing scrambling code generator polynomial blind recognition method provided by the preferred embodiment of the present invention includes the following steps:

[0031] ①According to the received data, select a sequence with an appropriate length N as the ciphertext sequence, which doubles as the test sequence C;

[0032] Represent the digital sequence in polynomial form, and rec...

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Abstract

The invention discloses a blind recognition method for a self-synchronization scrambling code generation polynomial. The method aims at a scrambling code sequence with a self-synchronization form. And a correlation degree alpha, which is a measure index, is introduced. a scrambling code data sequence with an enough length (a cryptograph sequence C) needs to be acquired; a key sequence Z can be obtained through the cryptograph sequence; the correlation degree alpha is obtained through calculating; the correlation degree is compared with a preset decision threshold. Blind recognition of self-synchronization scrambling code generation polynomial can be realized only through communication contents. Algorithm is simple. Identification speed is fast. The invention is suitable for the following fields of intelligent communication, signal reconnaissance, cipher analysis, communication confrontation and the like, and especially has wide application prospects in blind recognition for the scrambling code and in stream-cipher analysis.

Description

technical field [0001] The invention relates to a blind recognition method of a self-synchronizing scrambling code generating polynomial in a digital communication system, which is applicable to the fields of intelligent communication, communication reconnaissance, cryptanalysis, information confrontation and the like. Background technique [0002] Self-synchronizing scrambling technology is widely used in modern communications. Self-synchronizing scrambling is based on linear feedback shift registers (LFSR), and it is important in cryptography, secure communication, error-correcting code theory, information hiding technology, etc. These fields are also the hotspots of current non-cooperative communication research. [0003] At present, there are relatively few research results on blind recognition of self-synchronizing scrambling codes, and the scope of application is also limited. T. Siegenthaler introduced a classic ciphertext-only attack method in "Correlation immunity ...

Claims

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Application Information

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IPC IPC(8): H04L9/00H04L9/18H04L9/06H04K1/00H04K3/00
Inventor 张永光王挺楼财义
Owner 36TH RES INST OF CETC
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