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Space Data Link Secure Protocol Simulator

Space Data Link Secure Protocol Simulator. Bruno Saba DCT/TV/IN 15/04/2010. Rationale. A Secure Space Data Link Protocol has been developped for CNES by Thales Alenia Space (CNES R&D funds)

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Space Data Link Secure Protocol Simulator

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  1. Space Data Link Secure Protocol Simulator Bruno Saba DCT/TV/IN 15/04/2010

  2. Rationale • A Secure Space Data Link Protocol has been developped for CNES by Thales Alenia Space (CNES R&D funds) • The same contract included the developement of this simulator, in order to validate all the concepts of the Secure Protocol Space Data Link Secure Protocol Simulator CNES DCT/TV/IN B. Saba 14/04/2010

  3. Main Features • Simulation of a complete end to end Secure TM/TC link between a ground center and a spacecraft • Ground Data Link Layer Node for TC Forward link (GND-FWD) • Forward link ( TC : Ground  Spacecraft) • Spacecraft Data Link Layer Node for TC Forward link (SC-FWD) • Spacecraft Data Link Layer Node for TM Return link (SC-RTN) • Return link (TM : Spacecraft  Ground) • Ground Data Link Layer Node for TM Return link (GND-RTN) • Simulator management Space Data Link Secure Protocol Simulator CNES DCT/TV/IN B. Saba 14/04/2010

  4. Block Diagram Space Data Link Secure Protocol Simulator CNES DCT/TV/IN B. Saba 14/04/2010

  5. Blocks description • Ground Data Link Layer for TC Forward Link (GND-FWD) • Supports ground part of CCSDS TC data link protocol sublayer • Supports ground part of Secure Protocol • Generates TC frames (from a scenario file) and gives them to the Forward Link for transmission • Forward Link “Sender” • Transmits the TC frames to the “transmission channel” • Transmission channel : UDP/IP socket (localhost) Space Data Link Secure Protocol Simulator CNES DCT/TV/IN B. Saba 14/04/2010

  6. Blocks description (cont’d) • Forward Link “Receiver” • Receives the TC frames from the UDP/IP socket “transmission channel” (localhost) • Gives the received TC frames to the Spacecraft Data Link Layer Node for Forward link • Spacecraft Data Link Layer Node for TC Forward Link (SC-FWD) • Supports on-board part of CCSDS TC data link protocol sublayer • Supports on-board part of Secure Protocol • Provides CLCW to the Spacecraft Data Link Layer Node for TM Return link SC-FWD Space Data Link Secure Protocol Simulator CNES DCT/TV/IN B. Saba 14/04/2010

  7. Blocks description (cont’d) • Interface between Spacecraft Nodes • Supports routing of CLCW and Security TM data from SC-FWD to SC-RTN nodes • Spacecraft Data Link Layer Node for TM Return Link (SC-RTN) • Supports on-board part of CCSDS TM data link protocol sublayer • Supports on-board part of Secure Protocol • Generates TM Frames and inserts CLCW at the right place in TM data stream • Return Link “Sender” • Transmits the TM frames + CLCW to the “transmission channel” • Transmission channel : UDP/IP socket (localhost) SC-RTN Space Data Link Secure Protocol Simulator CNES DCT/TV/IN B. Saba 14/04/2010

  8. Blocks description (cont’d) • Return Link “Receiver” • Receives TM frames + CLCW from the UDP/IP socket “transmission channel” (localhost) • Gives the received data to the Ground Data Link Layer Node for Return Link • Ground Data Link Layer Node for TM Return link (GND-RTN) • Supports ground part of CCSDS TM data link protocol sublayer • Supports ground part of Secure TM protocol • Interface between ground nodes • Supports routing of CLCW and Security TM Data from GND-RTN to GND-FWD nodes GND-RTN Space Data Link Secure Protocol Simulator CNES DCT/TV/IN B. Saba 14/04/2010

  9. Blocks description (cont’d) • Simulator Management • Provides complete control of the simulator by the user, both on-line or off-line • On-line : with operator present • Off-line : no operator present, use of ASCII files • Reads scenario from file • TC and TM channels configurations (Unprotected, Authenticated, Authenticated and Encrypted) • Keys used, • … • Writes log results to file • Frames exchanges, errors, etc… • Provides synchronisation between processes Space Data Link Secure Protocol Simulator CNES DCT/TV/IN B. Saba 14/04/2010

  10. Software architecture Space Data Link Secure Protocol Simulator CNES DCT/TV/IN B. Saba 14/04/2010

  11. Next Step • Split the simulator in two completely independent programs • (1) Ground node • Elaborates TC frames (from scenario, or from a file received from Internet) • Computes TC security functions • Performs the ground part of the CCSDS TC link protocol (COP-1 management, …) • Sends the Secure TC Frames to the Spacecraft Node via UDP/IP socket • Receives TM frames from UDP/IP socket • Computes TM security functions • Retrieves CLCW and pass it on to the COP-1 management process • Compares the plaintext TM frame with the expected data (from scenario, or from a file received from Internet) • Performs control and monitoring functions, and synchronisation with the other node (exchange of data files via Internet) Space Data Link Secure Protocol Simulator CNES DCT/TV/IN B. Saba 14/04/2010

  12. Next Step (cont’d) • (2) Spacecraft node • Receives Secure TC frames from UDP/IP socket • Performs the Spacecraft part of the CCSDS TC link protocol (FARM-1 management) • Computes Security functions for TC link • Generates CLCW and Security TM data, and pass them on to the TM frame generation process • Compares the plaintext received TC frames with the expected data (from scenario, or from a file received from Internet) • Generates TM frames (from scenario, or from a file received from Internet) • Computes security functions for TM link • Performs the Spacecraft part of the CCSDS TM link (inserts CLCW, …) • Sends the TM frames to the Ground node via UDP/IP socket • Performs control and monitoring functions, and synchronisation with the other node (exchange of data files via Internet) Space Data Link Secure Protocol Simulator CNES DCT/TV/IN B. Saba 14/04/2010

  13. Conclusion • From the existing simulator, CNES can easily reuse the basic blocks to develop a new simulator for interoperability testing • This new simulator will be composed of two independant parts • Ground Node simulator • Spacecraft Node simulator • The interface between Ground Node and Spacecraft Node being based on UDP/IP, the frames could be sent easily via Internet to realize interoperability tests between two different Space Agencies Space Data Link Secure Protocol Simulator CNES DCT/TV/IN B. Saba 14/04/2010

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