Abstract
The construction method of the covert channel has always been a topic of research and exploration in the field of information security, and the use of IP data packets for covert channel construction is also an important method. Based on the above content, this paper proposes an enlarging-the-capacity packet sorting covert channel. We establish enlarging-the-capacity packet sorting covert channel model and derive the functional relationship between the total number of covert information transmitted and the number of ports. This method can send more secret information when the network status is not ideal. The simulation results show that the covert channel of the extended packet sorting has high performance in different packet loss rates and delays, and is superior to other IP covert channel.
Highlights
A covert channel in a network refers to the transmission of secret information using a portion of the system that is not transmitting data
The IP covert channel based on packet sort sets the time interval of sending packets to each port as t1, and the time T is the time it takes to transmit a set of secret information: T = n · t1 (4)
The relationship between the number of ports in the IP covert channel based on the packet sorting, the number of IP covert channel packet intervals based on the packet interval, and the different time intervals in the IP covert channel based on the packet interval are used to represent the relationship
Summary
A covert channel in a network refers to the transmission of secret information using a portion of the system that is not transmitting data. This paper mainly studies the covert timing channel, which means that the sender embeds information into time-related parameters Both parties send and receive secret messages through preset rules, such as rate of change, sequence, interval, and other time parameters [15]–[20]. The receiver will sort the corresponding ports based on the order in which the data packets arrive, and it will read the secret data through the lookup mapping table. This paper designs an enlarging-the-capacity packet sorting covert channel, modifying the time interval of packet transmission in IP covert channel based on packet sorting and using different time intervals to transmit data. These intervals can be used to transmit a set of data so that when the number of ports is constant, more hidden information can be transmitted
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