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A volatile covert channel structure

Author: ZhongJingMin
Tutor: LanShaoHua
School: Nanjing University of Technology and Engineering
Course: Applied Computer Technology
Keywords: Covert network channel volatile transmission delay BP neural network Information security Channel capacity
CLC: TP393.08
Type: Master's thesis
Year: 2011
Downloads: 20
Quote: 1
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Abstract


Network covert channel is an extension of information hiding technology, But,It’s not like the encryption method to expose the ciphertext to the attacker, Network covert channel hidden the existence of communication. The information is transmitted from one sie to the other side secretly. Therefore, covert channel is an important way to ensure transmission of information, A good covert channel can withstand attacks and interference from the third part, and has a larger channel capacity and transmission rate.This paper presents a concept of "volatile" of network covert channels, generally speaking when the covert channel is attacked by the attacker. The communication volatile like the water evaporate, even if all packets is interceped for analysis, It’s still not recognize the existence of covert channel, and also can not obtain the secret information that be transmitted. The paper gives a "volatile" network covert channel structure, and the specific design and implementation of a "volatile" network covert channel. That is the network covert channel based on transmission delay. Network covert channel based on transmission delay is the type of time covert channels, It’s through the BP neural network learning algorithm to predict the next packet transmission delay, the delay value is amplified through a mapping function to another range; because the network Extension is constantly changing in a short time, so the value of the time used to amplify the delay characteristics of packet sender sends the interval is changing, The receiver at the specific time interval wait for feature package to identify the secret information. The experimental data analysis, network covert channel based on time delay meet the requirement of "volatile" and has a strong anti-detection and interference.the experiment of the network covert channel based on delay enhance the covert channel, Discusse the capacity of covert channel channel and the relationship with channel hidding ability.

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