First, scaling issues were not considered in the
paper. The international air traffic and the increasing
carried passenger’s number are factors which need to
be taken into account: on-board entities may need to
exchange or check the validity of used certificates or
keys. This requires the use of a PKI adapted to the
aeronautical specific context. This PKI is also
fundamental to secure the negotiation protocol and
build the SSPD introduced in this paper.