Study performance indicators covert channels of steganographic systems in telecommunication networks

Automatic Detection of Covert Channels in Networks

CoChaT Covert Channels in Timed Systems

Serge Haddad was professor at Université Paris-Dauphine when I obtained a position of professor there in september 2004. We did some research work together from this time on, and this cooperation went on after our respective position changes : in Ecole Normale Supérieure de Cachan (feb. 2008) for S. Haddad and in Université Pierre et Marie Curie (sept. 2008) for me. More precisely, a first step...

Steganographic Communication in Ordered Channels

In this paper we focus on estimating the amount of information that can be embedded in the sequencing of packets in ordered channels. Ordered channels, e.g. TCP, rely on sequence numbers to recover from packet loss and packet reordering. We propose a formal model for transmitting information by packet-reordering. We present natural and well-motivated channel models and jamming models including ...

Steganographic Timing Channels

This paper describes steganographic timing channels that use cryptographic primitives to hide the presence of covert channels in the timing of network traffic. We have identified two key properties for steganographic timing channels: (1) the parameters of the scheme should be cryptographically keyed, and (2) the distribution of input timings should be indistinguishable from output timings. Thes...

Covert Channels | Here to Stay? Covert Channels | Here to Stay?

We discuss the di culties of satisfying high-assurance system requirements without sacri cing system capabilities. To alleviate this problem, we show how trade-o s can be made to reduce the threat of covert channels. We also clarify certain concepts in the theory of covert channels. Traditionally, a covert channel's vulnerability was measured by the capacity. We show why a capacity analysis alo...