Abstract:

Based on the requirements of information security for spacecraft telecommand and data protection mechanism adopted, the weakness of short length spacecraft telecommand messages in secure transmission was analyzed. To overcome the weakness a message extension method based on physical chaos source and its application were presented in this paper. The channel error control measures applied with the message extension method were also presented. With the method mentioned the entropy of telecommand messages will obviously be increased and the security of transmission enhanced as well.

Key words: spacecraft telecommand, information security, message extension, cryptography, error control