Abstract: A method for locating an asset in an environment, the method comprising. The method comprises capturing, with a camera, a first image of the asset, wherein in the first image, a light source positioned on or adjacent to the asset is in a first state; capturing, with the camera, a second image of the asset, wherein in the second image, the light source is in a second state; and determining the location of the asset in the environment based on the first image, second image and camera-specific information.

Abstract: The sender stores a pair of sender's public and private keys and a public key of the receiver, and carries out the steps of: A—generating a master key, that is a secret shared with the receiver, by key derivation from a current root key and using the sender's private key and the receiver's public key, and updating the root key with the generated master key; B—generating, by key derivation from said master key, a chain of message keys for securing messages to communicate to the receiver; C—generating a next pair of sender's public and private keys, sending the next sender's public key to the receiver and executing again the steps A and B using the next sender's private key and the same receiver's public key; wherein the current root key used in the step A is at a first iteration of step A, an initial root key prestored in the sender, said initial root key being a secret shared with the receiver, and at each subsequent iteration of the step A, the root key that has been updated at the preceding iteration of

Abstract: A method for locating an asset in an environment, the method comprising receiving, at a first receiver, signal from a tag associated with the asset, wherein the tag is positioned on or adjacent to the asset; receiving, at the first receiver, a signal from the tag associated with the asset at a second time, wherein the second time is different to the first time, and wherein the first receiver has moved location in the environment between the first time and the second time; receiving, at a second receiver, a signal from the tag associated with the asset; and determining the location of the asset in the environment based on the signal received at the first receiver at the first time, the signal received at the first receiver at the second time, the signal received at the second receiver, a track of the location of the first receiver in the environment at the first time and the second time, and a location of the second receiver in the environment at the time when the second receiver received the signal.