Transmissions over time based covert channels across a network
We created a system in order to transmit and receive data by modifying the time intervals between packets.
sudo apt-get install libnetfilter-queue-dev
sudo pacman -S libnetfilter_queue
Setup iptables rules based on the example_rules_single_computer.sh file provided.
N.B. once you’ve activated these iptables rules, then packets will not be sent out from the computer until you run the program below.
Run the transmitter using:
echo "helloworld" | ./timeshifter 0 2000 3000
Run the reciever using:
./timeshifter 1 2000 3000
Then ping a remote host, the transmitting packet's intervals will be modulated with your data, the pong replies will then be decoded by the reciever.
Please see https://www.anfractuosity.com/projects/timeshifter/ for additional explaination