As the practical
covert channel detection requires small window-size, the number of the observed IPDs is set to l = 2000.
The main area of study in the modern steganography, consequently are in the network steganography, also, are the
covert channels. A
covert channel is any communication channel that can be exploited by a process to transfer information in a manner that violates the systems security policy [2].
Israel's intelligence effort, they say, began in 2012, when the Obama administration first opened a
covert channel with Tehran.
In this paper we reveal one such
covert channel on Android platform of relatively low permission requirements and hence more stealthiness compared with other exposed channels so far.
Among the topics are RFID standards, hardware attacks, an overview of cryptography, privacy versus performance in denial-of-service attacks on RFID systems, and
covert channel attacks in RFID-enabled supply chains.
Silently sending SMS messages can create a
covert channel for siphoning sensitive information from a device.
British intelligence twice rebuffed attempts by the secret wartime opposition in Nazi Germany to open up a
covert channel of communications.
Other features include simultaneous recording and playback, timer recording, alarm and pre-alarm recording, a
covert channel function for sensitive applications, and built-in motion detection.