Abstract: A method for operating a trusted geolocation beacon, the method comprising the steps of: generating (101) a public and private keys pair associated with the beacon; associating a unique identifier with the beacon; transmitting (104) the public key associated with the unique identifier to an external device; cyclically transmitting (201) beacon's identifier as well as its transmitter's signal power (202); transmitting (302) a signal comprising unencrypted, variable data; transmitting (303) a signal comprising encrypted variable data, which (after a decryption) are the same as the unencrypted variable data, the encryption being effected by using the private key associated with the beacon.