A computing system may generate and/or use a behavior photographic identification (“behavior photo ID”) that is based, at least in part, on anonymized parameters related to the behavior of a person. The behavior can include a history of phone calls, texts, or internet browsing. The behavior photo ID, which may be used to uniquely identify the person, may digitally modify a digital photo to encode behaviors or activities of the person. In some implementations, the behavior photo ID may be modified periodically, or from time to time, to produce an updated behavior photo ID that reflects new external events as well as relatively recent behaviors or activities of the person.