A network covert channel violates security rules and leaks information imperceptibly. Many researchers have been studying how to construct it, and the basic methods involve exploiting packets head, packets sorting and packets timing, etc. To construct a more secret covert channel, this paper proposes a novel approach based on packet classification. With this method, covert information is encode...

While the secure transaction schedulers in multilevel secure database systems synchronize transactions cleared at different security levels, they must consider the problem of covert channel. Through the covert channel, malicious users leak secret information in a way of intentional interference among the transactions that they invoked. Much work had been done for closing the covert channel. Alt...

Cloud computing is becoming increasingly popular because of the dynamic deployment of computing service. Another advantage of cloud is that data confidentiality is protected by the cloud provider with the virtualization technology. However, a covert channel can break the isolation of the virtualization platform and leak confidential information without letting it known by virtual machines. In t...

Attention can be directed to particular spatial locations, or to objects that appear at anticipated points in time. While most work has focused on spatial or temporal attention in isolation, we investigated covert tracking of smoothly moving objects, which requires continuous coordination of both. We tested two propositions about the neural and cognitive basis of this operation: first that cove...

Covert Channel are the methods to conceal a message in the volatile medium carrier such as radio signal and network packets. Until now, covert channels based on the packet length produce abnormal packet length when the length of the message is long. Abnormal packet length, especially in the normal network will expose the covert channels to network security perimeter. Therefore, it motivates the...

We identify a class of covert timing channels with the following properties. (1) existing covert timing channel analysis techniques are inappropriate for the channels in this class; and (2) it includes the fastest (i.e., highest capacity) covert channels known to date. Since channels in this class are exploited by counting the occurrences of certain events, we call them counting channels. We de...

Covert timing channels aim at transmitting hidden messages by controlling the time between transmissions of consecutive payload packets in overt network communication. Previous results used encoding mechanisms that are either easy to detect with statistical analysis, thus spoiling the purpose of a covert channel, and/or are highly sensitive to channel noise, rendering them useless in practice. ...

Abstract Covert research has a mixed reputation within the scientific community. Some are unsure of its moral worth, others would proscribe it entirely. This stems largely from lack knowledge about reasons for choosing covert method. In this chapter, these will be reconstructed in detail and all elements that allow one to judge level ethicality laid out reader. particular, chapter answer follow...

Covert channel is a major threat to the information system security and commonly found in operating systems, especially in cloud computing environment. Owing to the characteristics in cloud computing environment such as resources sharing and logic boundaries, covert channels become more varied and difficult to find. Focusing on those problems, this paper presents a universal method for detectin...