Three Apple engineers and three Microsoft engineers are traveling by train to a conference. At the station, the three Microsoft engineers each buy tickets and watch as the three Apple engineers buy only a single ticket. "How are three people going to travel on only one ticket?" asks a Microsoft engineer. "Watch and you'll see," answers the Apple engineer.
They all board the train. The Microsoft engineers take their respective seats but all three Apple engineers cram into a rest room and close the door behind them. Shortly after the train has departed, the conductor comes around collecting tickets. He knocks on the rest room door and says, "Ticket, please." The door ope
On Covert Acoustical Mesh Networks in Air (RE: Bad Bios)
"Abstract-Covert channels can be used to circumvent system and network policies by establishing communications that have not been considered in the design of the computing system. We construct a covert channel between different computing systems that utilizes audio modulation/demodulation to exchange data between the computing systems over the air medium. The underlying network stack is based on a communication system that was originally designed for robust underwater communication. We adapt the communication system to implement covert and stealthy communications by utilizing the near ultrasonic frequency range.