Abstract:

The existing security schemes are not suitable for interplanetary Internet, because they have some problems: be lack of interplanetary network security, the certification about interplanetary Internet nodes, and low efficiency in key management and secure authentication and high complexity in cipher algorithm. We propose the lightweight cryptography and lightweight security algorithm for interplanetary backbone networks. It can solve the problem that encounters malicious nodes in the process of backbone networks networking by threshold secret sharing mechanism. By the concept of CPK based on ECC, authentication is efficient without the third-party CA, and the lightweight ECC we proposed can speed up point multiplication to reduce the computational complexity; the key management can meet the resource limit in deep communication, and the key security depends on the exponential computation complexity of the elliptic discrete logarithm decomposition; the scheme also uses the improved two-way authentication to ensure the communication security between common spacecraft and satellite, which can prevent man-in-the-middle attack.

Key words: deep space communication, authentication, key management, lightweight