The three techniques extend SPS by using one or a set of intermediate trusted nodes.
Each intermediate node calculates its trust value whenever it receives the RREQ packet.
"This is a very important advance," says Toshiba's Shields, because it would enable technologists to share quantum keys on networks where the intermediate nodes can't be trusted, and it could also lead to more complex multiparty communication protocols based on distributed entanglement.
In fact, the following assumptions they make are unable to cope with the characteristics of MASNets: First, the intermediate routers are assumed to be trusted and do not contribute to the security incident.
The tendency is for both sides to choose betrayal (thus obtaining an intermediate result) unless a high level of trust exists between them.
This game-based forwarding strategy depends on two aspects: the past behavior of the network when the intermediate node acted as a source and the trust level that the intermediate node has in the source node.
Otherwise, after very few successful transmissions, it would appear as if the intermediate nodes are always cooperative regardless of the derived trust values.
The timer is used to examine the same RREQ packets that arrive at different times to the intermediate node, and then, the one with the highest trust value is forwarded.
Over time, this difference is likely to translate into clinically meaningful intermediate outcomes, such as better patient acceptance through increased trust in the device, fewer false-positive hypoglycaemia alarms, better prevention of hypoglycaemia and lower mean glucose values.
PINQ employs a request/reply model, which avoids adding noise to the intermediate results of the computation by keeping them on a trusted data server or an abstraction of a trusted data server provided by a distributed system.
