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

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

3. 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

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

5. 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) GND-FWD

6. 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

7. 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

8. 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

9. 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

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

11. 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)

12. 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)

13. 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