The computer-implemented or hardware-implemented method of entity identification, comprising: a) providing a network of nodes with input from a plurality of sensors; b) generating, by each node of the network, an activity level, based on the input from the plurality of sensors; c) comparing the activity level of each node to a threshold level; d) based on the comparing, for each node, setting the activity level to a preset value or keeping the generated activity level; e) calculating a total activity level as the sum of all activity levels of the nodes of the network; f) iterating a)-e) until a local minimum of the total activity level has been reached; and g) when the local minimum of the total activity level has been reached, utilizing a distribution of activity levels at the local minimum to identify a measurable characteristic of the entity. The disclosure further relates to a computer program product and an apparatus for entity identification.