Time type network covert channel construction method based on discrete wavelet transform

Abstract

The invention discloses a time type network covert channel construction method based on discrete wavelet transform, and belongs to the technical field of network information security. According to the time type network covert channel construction method disclosed by the invention, a secret message is embedded in a wavelet domain coefficient of a normal IPD sequence, and the embedding position and intensity are controlled to reduce the time domain changes to the original carrier and the properties of the original carrier as much as possible; and the generated covert communication data streams have normal rules and features and better anti-detection property. Meanwhile, the secret message bits are embedded in a part of approximation coefficients of wavelet decomposition by adopting the odd-even quantification method, and the network noise interference can be resisted to a certain extent without importing additional synchronization cost, and the robustness is relatively good.

Description

technical field [0001] The invention relates to a method for constructing a temporal network hidden channel based on discrete wavelet transform, and belongs to the technical field of network information security. Background technique [0002] The rapid development of computer network technology has brought great convenience to the sharing and transmission of information, but at the same time, security issues such as information leakage and network attacks have become increasingly prominent. The communication process of secret information (such as involving national, military secrets, commercial secrets, personal privacy, etc.) is facing great security threats and hidden dangers. The traditional solution uses cryptography to encrypt information so that the attacker cannot obtain its content, but the messy ciphertext is enough to provide favorable evidence. [0003] As a kind of steganographic technology, network covert channel is a covert communication technology that uses n...

AI Technical Summary

Problems solved by technology

However, most of the existing algorithms will generate abnormal data streams or features. The reason is that the embedding of secret messages changes the inherent communication time attributes of normal carrier data streams and increases the probability of detection and analysis by the attacked party.

In addition, in the time-based implicit channel, the synchronization between the two parties is more difficult, because it is easily affected by the unstable network environment, such as delay, jitter and other noise interference.

In order to ensure communication reliability, confirmation mechanisms or error correction codes similar to TCPACKs are generally used at present, but the introduction of these synchronization mechanisms often increases the complexity of the algorithm and transmission overhead, and reduces the bandwidth of the hidden channel.

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