Link 1 is a computer network standard developed by NATO to provide information exchange for air defence.
NATO TDL Standards are being developed by the Data Link Working Group (DLWG) of the Information Systems Sub-Committee (ISSC).
Today the Link 1 TDL Standard is not only used by NATO nations but also in Partnership for Peace (PfP) countries.
The following tracks are exchanged by Link 1 between different users of the Recognized Air Picture (RAP).
[citation needed] Moreover, there is no IT security of information transmitted, as the result of no Electronic countermeasure (ECM) resistance and insufficient encryption.