In this paper, we propose CoCo, a novel framework for establishing covert timing channels. The CoCo covert channel modulates the covert message in the inter-packet delays of the network flows, while a coding algorithm is used to ensure the robustness of the covert message to different perturbations. The CoCo covert channel is adjustable: by adjusting certain parameters one can trade off differe...

In this paper, we examine general mechanisms that a covert channel may exploit and derive new minimum requirements for setting up a covert channel. We also propose a new classification of covert channels based on our analysis. Unlike the non-interference approaches, our approach is constructive, allowing the direct examination of system architectures at different abstraction levels for the pres...

Many parasites and pathogens cause silent/covert infections in addition to the more obvious infectious disease-causing pathology. Here, we consider how assumptions concerning superinfection, protection and seasonal host birth and transmission rates affect the evolution of such covert infections as a parasite strategy. Regardless of whether there is vertical infection or effects on sterility, ov...

Covert channels is a vital setup in the analysing the strength of security in a network. Covert Channel is illegitimate channelling over the secured channel and establishes a malicious conversation. The trap-door set in such channels proliferates making covert channel sophisticated to detect their presence in network firewall. This is due to the intricate covert scheme that enables to build rob...

In this paper we analyze the possibility for malicious agents to transmit an information possibly hidden in a Multi Level Security System via a covert channel. We give a framework for which we get two decidability results. Firstly, given a code and a system one can decide whether the system allows a covert channel for this code. Secondly, one can decide whether there exists a code to transmit o...

Covert channels emerged in mystery and departed in