A system and method are disclosed for sending advertising data to an end user device. The system includes but is not limited to a processor in data communication with a computer readable medium; and a computer program embedded in the computer readable medium, the computer program including but not limited to instructions to send first password data to a first group of end user devices that have exchanged a first advertising key data in a first advertising category; and instructions to send first advertising data encoded using the first password to the first group of end user devices.