Here’s the link to RFC 0044: Relay Nodes.
This RFC will propose a method to enforce a joining “cost” for new or restarting vaults to join the network. This is a mechanism to prevent mass joining quickly and therefor will introduce a cost of such an attack that is proportional to the network “effort” over time.
SAFE has already taken advantage of securing groups and group consensus. It also, with disjoint groups, secures hops which prevents nodes masquarading as network identities. It still though has a weakness in a possible attack where an attacker can easily restart many nodes constantly to target a network location. The difficulty of such an attack is not considered here, merely the opportunity of such an attack exists in some form.
The Effort of the network should allow that a proportionate amount of effort is carried out by a node wishing to join. This distinction requires a measurement of such work as well as a task that is adventageous to the network. One such tas that is currently under-rewarded is providing the access points (relays) for client nodes. This function is onerous on nodes in the netwoork, but at the same time it is critical.This is the initial observation.