  Satellites, are both crucial and, despite common misbelieve, very fragile
parts our civilian and military critical infrastructure. While, many efforts
are focused on securing ground and space segments, especially when national
security or large businesses interests are affected, the small-sat, newspace
revolution democratizes access to, and exploitation of the near earth orbits.
This brings new players to the market, typically in the form of small to medium
sized companies, offering new or more affordable services. Despite the
necessity and inevitability of this process, it also opens potential new venues
for targeted attacks against space-related infrastructure. Since sources of
satellite ephemerides are very often centralized, they are subject to classical
Man-in-the-Middle attacks which open venues for TLE spoofing attack, which may
result in unnecessary collision avoidance maneuvers, in best case and
orchestrated crashes, in worst case. In this work, we propose a countermeasure
to the presented problem that include distributed solution, which will have no
central authority responsible for storing and disseminating TLE information.
Instead, each of the peers participating to the system, have full access to all
of the records stored in the system, and distribute the data in a consensual
manner,ensuring information replication at each peer node. This way, single
point of failure syndromes of classic systems, which currently exist due to the
direct ephemerids distribution mechanism, are removed. Our proposed solution is
to build data dissemination systems using permissioned, private ledgers where
peers have strong and verifiable identities, which allow also for redundancy in
SST data sourcing.
