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An Improved Anti-tapping Method Based on Fountain Code

A fountain and decoding technology, applied in the baseband system, baseband system components, wireless communication, etc., can solve the problem of high decoding rate of eavesdroppers

Active Publication Date: 2020-08-28
LIAONING UNIVERSITY OF TECHNOLOGY
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  • Claims
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Problems solved by technology

[0005] Therefore, in the existing coding method, due to the randomness of the arrangement of each column of the coding matrix, there is a possibility that the eavesdropper and the receiver can restore the source information at the same time or in advance, so that the decoding rate of the eavesdropper reaches a high

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  • An Improved Anti-tapping Method Based on Fountain Code
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  • An Improved Anti-tapping Method Based on Fountain Code

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Embodiment 1

[0051] An improved anti-eavesdropping method based on fountain codes is characterized in that it comprises the following steps:

[0052] Step 1: Perform channel estimation on the channel between the source and the receiver, and obtain the channel deletion probability P between the two er ;

[0053] Step 2: The source quantifies the source information to obtain source message symbols, and then performs grouping, and each group has k source message symbols;

[0054] Step 3: The coding matrix source randomly generates k / (1-P according to the RSD degree distribution function er ) column coding matrix P 1 , the P 1 The columns in are rearranged according to the value of degree d from large to small, and the obtained k×k / (1-P er ) coding matrix is ​​set to P 1 ', P 1 ', the column corresponding to degree 1 is arranged in the back; continue to obtain the coding matrix P according to the RSD degree distribution function 2 , whose column is long enough to satisfy m≥k, where m re...

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Abstract

An improved anti-eavesdropping method based on fountain codes, comprising the following steps: 1. Channel estimation is performed between the source and the receiving end to obtain the channel deletion probability Per between the two; 2. The source quantifies the source information Obtain the binary message codeword, and then group it; 3. Obtain the improved LT encoding matrix P'; 4. According to the encoding matrix P', multiply it with the source message codeword to obtain the improved LT code, and the improved LT 5. The receiving end receives the LT code encoding symbol, if the encoding symbol is correct, it will participate in BP decoding until all source message codewords are decoded, and then send ACK confirmation characters to the source; 6. After the source receives the ACK confirmation character sent by the receiver, it stops sending the improved LT coded symbols; prepares the next group of k message symbols and repeats step 4 until all source messages are sent. The present invention combines channel noise to increase the probability that the eavesdropper lags behind the receiver in recovering information, and achieves the purpose of increasing the bit error rate of the eavesdropper.

Description

technical field [0001] The invention belongs to the technical field of wireless transmission information security, in particular to an improved anti-eavesdropping method based on a fountain code. Background technique [0002] With the rapid development of the information age, wireless transmission has become an indispensable part of people's daily life. Due to the broadcast characteristics of wireless communication, the interception and malicious use of data pose a huge threat to wireless communication, and wireless voice communication is also vulnerable to the threat of eavesdropping within the transmission range, especially when some commercial secrets, military secrets and sensitive personal information are involved. If it is eavesdropped during the transmission, it will cause huge losses, and the problem of wireless communication security has to be solved. [0003] The LT code is a kind of practical code with unlimited code rate belonging to the fountain code. The LT co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04B7/0456H04W12/00H04W12/126
CPCH04B7/0456H04L25/0202H04L25/0242H04W12/00
Inventor 牛芳琳王南孙福明张娅
Owner LIAONING UNIVERSITY OF TECHNOLOGY