| role user (Ui, Sj, GW : agent, | | Kdi: symmetric_key, | | Kug: symmetric_key, | | H: hash_func, | | P: text, | | SND_US,RCV_US: channel (dy)) | | played_by Ui | | def= | | local State : nat, | | T1,K1,Na,Nb,SIDj,IDi,SK : text | | const user_sensor_sk,sc_user_id:protocol_id | | initState 0 | | transition | | (1) State = 0RCV_US(start)=> | | State 2 T1 new() | | K1 new() | | Na exp(P,K1) | | SND_US(Na | | .xor((IDi.SIDj),Kug) | | .H(Na.xor((IDi.SIDj),Kug).Kdi.T1) | | .T1) | | secret(IDi,sc_user_id,) | | secret(IDi,sc_sensor_id,) | | (2) State = 2 RCV_US(Nb | | .H(Nb.Kdi.H(Na.xor((IDi.SIDj),Kug).Kdi.T1).Na.T1))=> | | State 4 SK≔ H(exp(Nb,K1)) | | witness(Ui,Sj,user_sensor_sk,SK) | | request(Ui,Sj,user_sensor_sk,SK) | | end role |
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