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Table 3 Exchanged messages

From: TSME: a trust-based security scheme for message exchange in vehicular Ad hoc networks

Message Meaning
\(M_{b}(Id_{v_{i}},\,(x_{i},y_{i}),\,vel_{v_{i}},\,d,\,ts)\) This message is broadcast by the vehicle identified by \(Id_{v_{i}}\) to all its neighbors to notify them of its location \((x_{i},y_{i})\), its velocity \(vel_{v_{i}}\) and its direction d
ts is the timestamp associated with this message
\(M_{ack}(Id_{v_{j}},\,s_{v_{j}},\,ts)\) The acknowledgment message is sent by a vehicle identified by \(Id_{v_{j}}\) to a vehicle \(v_{i}\) to notify it of its reputation score \(s_{v_{j}}\)
ts is the timestamp associated with this message
\(M_{GH}(GH_{id},\,G_{id},\,Members,\,ts)\) The GH message is sent by a GH vehicle to all its group members to inform them of its identity \(GH_{id}\), the group identifier \(G_{id}\), and the set of members Members belonging to this group. ts is the timestamp associated with this message
\(M_{join}(Id_{v_{i}},\,GH_{id},\,ts)\) The join message is broadcast by a member vehicle identified by \(Id_{v_{i}}\) to inform other members that it is going to join the cluster whose GH’s identifier is \(GH_{id}\). ts is the timestamp associated with this message
\(M_{Blacklist}(GH_{id},\,Id_{v_{i}},\,ts)\) A Blacklist message is sent by the GH \(GH_{id}\) in order to inform the RSU that a vehicle identified by \(Id_{v_{i}}\) is acting maliciously. ts is the timestamp associated with this message
\(M_{warning}(Id_{v_{id}},\,s-flag,\,ts)\) The warning message is sent by the RSU to GHs in order to inform them about a misbehaving s-flag = ‘B’ vehicle identified by \(Id_{v_{i}}\)
The same message can be send by the RSU to GHs in order to inform them about a rehabilitated s-flag = ‘H’ vehicle identified by \(Id_{v_{i}}\)
ts is the timestamp associated with this message
\(M_{event}(Id_{v_{i}},\,type,\,(x,y),\,l,\,t_{r})\) An event message is sent by a vehicle identified by \(Id_{v_{i}}\) to its GH to report an observed event by indicating its type \(type\in \) {accident, road liberation, traffic information}, (xy) the coordinates of the event’s location, l the location of the vehicle when it generated the message, and \(t_{r}\) the reporting time