IP Channel (IPTC) [11]

Transmitting 1-bit or 0-bit by choosing send or not send a packet during interval w

Passive

Yes

Time-Replay Channel (TRTC) [9]

Transmitting 1-bit or 0-bit by choosing historic legitimate IPDs as additional input from different baskets

Active

Yes

Botnet Traceback Watermark (BTW) [15]

Injecting modified control text

Passive

Yes

JitterBug [6]

Operates small delays in keystrokes to affect the original IPDs

Passive

Yes