A method for assessing a level of trust associated with a first node in a mobile ad hoc network , said method comprising: receiving, at a second node in the mobile ad hoc network, at least a first message associated with the first node, the message having application information comprising velocity information and at least one signal characteristic comprising tracking frequency information, wherein the application information and the at least one signal characteristic have at least one established relationship with each other; receiving, at the second node in the mobile ad hoc network, at least a second message (308. 408, 508) associated with the first node, the message having application information comprising velocity information and at least one signal characteristic comprising tracking frequency information, wherein the application information and the at least one signal characteristic have at least one established relationship with each other; determining an expectation from the application information and/or the at least one signal characteristic of the first message on the basis of a model comprising a Doppler effect defining the relationship between 1) a difference or a ratio of a first tracking frequency information of the first message and a second tracking frequency information of the second message and 2) a first relative velocity information, relative between the first node and the second node, determined on the basis of a first velocity information in the first message and a second relative velocity information, relative between the first node and the second node, determined on the basis of a second velocity information in the second message; determining whether the expectation corresponds with an observation from the application information and/or the at least one signal characteristic for the the second message to assess the level of trust associated with the first node. receiving, at a second node in the mobile ad hoc network, at least a first message associated with the first node, the message having application information comprising velocity information and at least one signal characteristic comprising tracking frequency information, wherein the application information and the at least one signal characteristic have at least one established relationship with each other; receiving, at the second node in the mobile ad hoc network, at least a second message (308. 408, 508) associated with the first node, the message having application information comprising velocity information and at least one signal characteristic comprising tracking frequency information, wherein the application information and the at least one signal characteristic have at least one established relationship with each other; determining an expectation from the application information and/or the at least one signal characteristic of the first message on the basis of a model comprising a Doppler effect defining the relationship between 1) a difference or a ratio of a first tracking frequency information of the first message and a second tracking frequency information of the second message and 2) a first relative velocity information, relative between the first node and the second node, determined on the basis of a first velocity information in the first message and a second relative velocity information, relative between the first node and the second node, determined on the basis of a second velocity information in the second message; determining whether the expectation corresponds with an observation from the application information and/or the at least one signal characteristic for the the second message to assess the level of trust associated with the first node. <EOS>