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As outlined in Figure above, the basic steps for outbound packet processing are as follows:
- 12.
- Poll for message data waiting to be sent.
- 13.
- If there is no message data waiting, immediately send the packet and return.
- 14.
- Create a new formatted message with header based on the properties of the RTP packet who's payload is being used as cover-medium.
- 15.
- Read as much of the waiting data as will fit in the formatted message.
- 16.
- Encrypt the message.
- 17.
- Embed the message into the RTP payload cover-medium.
- 18.
- Send the modified RTP packet in place of the original via the NetFilter user-space queue.
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