Algorithm 3 Change the Pseudonym

1:procedureShould_I_Change_my_Pseudonym() 2:    if ((the speed variation, i.e., the difference between $Max\_speed$ and $Min\_speed$), is ≥$Speed\_var\_thr$) AND (the time while $v_i$ was silent is ≥$Min\_silent\_time$) AND (the time while $v_i$ was silent is ≤$Max\_silent\_time$) AND (the distance while $v_i$ was silent is ≥$Min\_silent\_dist$) AND (the set $My\_set$ of $v_i$ is ≥ the threshold $k\_prv$) AND (the $Set\_novelty\_ratio$ value is ≥$10\%$)) then 3:           $Change\_the\_Pseudonym\left(\right);$                                      ▹ and reinitialize the regular pseudonym change timer 4:    else if (the time while $v_i$ was silent is >$Max\_silent\_time$) then             Force $v\_i$ to leave the silence state in order to ensure efficient pseudonym changes and achieve the vivacity and assiduity requirements. 5:    end if 6:end procedure