Method for determining, onboard a first mobile entity , a level of trust for a second mobile entity in communication with the first mobile entity , the method comprising: determining , by the first mobile entity , direct trust data based on a number of positive interactions and negative interactions between the second mobile entity and the first mobile entity ; calculating , by the first mobile entity , an initial reputation indicator based on the direct trust data , wherein the initial reputation indicator includes a belief value, a disbelief value, an uncertainty value, and a base trust rate; calculating , by the first mobile entity , a confidence level based on the belief value, the base trust rate, and the uncertainty value; and determining an updated reputation indicator based on the initial reputation indicator and the confidence level wherein the belief value indicates a statistical probability that the second mobile entity is trustworthy, the disbelief value indicates a statistical probability that the second mobile entity is untrustworthy, and the uncertainty value is the corresponding uncertainty of these probabilities; ; wherein the base trust rate is indicative of the trust level for data transmitted from an unknown mobile entity that has not been in contact with the first mobile entity in the past; wherein a positive interaction is an interaction where the data received from the second mobile entity match defined quality criteria; wherein a negative interaction is an interaction where the data received from the second mobile entity do not match the quality criteria; wherein the updated reputation indicator indicates a level of trust of the first mobile entity in the second mobile entity . determining , by the first mobile entity , direct trust data based on a number of positive interactions and negative interactions between the second mobile entity and the first mobile entity ; calculating , by the first mobile entity , an initial reputation indicator based on the direct trust data , wherein the initial reputation indicator includes a belief value, a disbelief value, an uncertainty value, and a base trust rate; calculating , by the first mobile entity , a confidence level based on the belief value, the base trust rate, and the uncertainty value; and determining an updated reputation indicator based on the initial reputation indicator and the confidence level wherein the belief value indicates a statistical probability that the second mobile entity is trustworthy, the disbelief value indicates a statistical probability that the second mobile entity is untrustworthy, and the uncertainty value is the corresponding uncertainty of these probabilities; ; wherein the base trust rate is indicative of the trust level for data transmitted from an unknown mobile entity that has not been in contact with the first mobile entity in the past; wherein a positive interaction is an interaction where the data received from the second mobile entity match defined quality criteria; wherein a negative interaction is an interaction where the data received from the second mobile entity do not match the quality criteria; wherein the updated reputation indicator indicates a level of trust of the first mobile entity in the second mobile entity . <EOS>