Identified Problems and Challenges

Many problems and challenges that arise when considering the use of steganography with RTP stem from properties of the underlying transport mechanism, the nature of real-time audio, or the RTP protocol itself. The following sections outline various problems and challenges that were identified when attempting to use steganography with RTP.

• Unreliable Transport
• Cover-Medium Size Limitations
• Latency
• Tracking of RTP Streams
• Raw vs. Compressed Audio
  • Lossy vs. Lossless Compression
  
  
• Media Gateway Audio Modifications
  • Audio Codec Conversion
  • Down-sampling and Normalization
  • Audio Stream Mixing
  
  
• Mid-session Audio Codec Change