Taking advantage of the upgrading of the Spacecraft Computer Unit (SCU) towards a more optimized architecture, for Eurostar 3000 (E3000) Satellite platform and supported by ESA ARTES4 R&D funding, EADS Astrium has designed and developed a new security function for the Telecommand (TC) link between the Ground and Space segments.
The aim of the new security function is to provide better confidentiality protection for the TC data and to provide at the same time all the guarantees about the authentication of the source of the data, and their integrity.
This security function is based on the use of the AES algorithm, for the protection of the data and on the use of the GCM mode for the implementation of the upper security layer, more dedicated to the authentication and to the integrity aspects.
Security methods, AES and GCM modes are based on the NIST standards; FIPS 197 and SP800-38D, and are implemented within the dedicated module of E3000 Data Handling Subsystem (DHS), named AES CDU.
The main benefits of this product and its associated services are:
- Confidentiality: security service to keep the content of information accessible to only those authorized to access it - encryption,
- Integrity: security service to make sure that data is not modified, deleted or inserted with other data by unauthorised users - checksum or signature,
- Authentication: service assuring that origin of messages is correctly identified - signature.
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