The Solution of Key Transmission in Multi-level Network Steganography

In recent years, multi-level steganography has become a new research direction in the network steganography. In order to ensure transmitting the key and the ciphertext covertly in multi-level steganography, a solution of key transmission is proposed in this paper. The proposed solution consists of 2 methods. The upper-level method is used to transmit the ciphertext. The lower-level is used to deliver the key covertly. The experimental results showed that this solution can realize synchronous transmission of the ciphertext and the key, which has a high steganographic bandwidth and a low steganographic cost, improving the security of network steganography.