Recording communication of Skype

1
Recording communication of Skype

• Made by
• Martin Fúsek

2
Problems

• Text messages recording
• Analysis and implementation of voice recording

3
Schematic
Application
Skype
SendMessage/WndProc
Internet
WM_COPYDATA
File
4
Application progress

• Windows Api initialization
• Connection with Skype
• Program send to all windows message with demand
  for communication with Skype
• Waiting for respond
• Skype Api translation
• Messages are sending via window massage loop in
  UTF8 null terminated string
• Sound recording
• Saving protokol of communication

5
Structure of protocol

• Protocol is stored as text file with UTF8
  character encoding
• Part of record is separated by tabulation
  character
• Records is separated by new line character
• If one part of record have more parts, parts are
  separated by space character
• Example Outgoing chat massage
• o\t
• ltmonthgt/ltdaygt/ltyeargt lthourgtltminutegtltsecondgt\t
• ltsendergt\t
• ltrecipient separated by spacegt\t
• lttextgt\t\n

6
Technology of sound recording

• Type of recording in Microsft Windows
• through waveOut waveIn
• MCI
• DirectShow
• Type of sound unit
• Default sound recording unit
• Using hardware cable
• Using software cable

7
Software cable

• Is based on virtual sound device and must by
  implemented as sound card driver
• Type of sound card driver
• DMA based (usual sound cards)
• Extension of Windows kernel (VAC)
• USB audio
• Firewire audio

8
Conclusion

• I made connection between Skype and my
  application and my application record text
  massages.
• Sound recording is implemented through
  waveIn/waveOut via default recording unit
• Full solution must be made by implementing
  software cable