Various types of
network traffic provide for various types of hidden
communications
Embedding within TCP
session can provide for two-way communications
Multicast
UDP or ICMP traffic could be used for a steganographic broadcast
The variations in types of network traffic provide for many potential
uses of steganography.
Using TCP sessions provide the potential for full-duplex
communications due to its connection-oriented nature.
Multicast UDP or ICMP, for example, could be used for broadcast of a
steganographic message.