A security element having an electronic display device, particularly a digital display for representing security-relevant information or patterns is provided, wherein the represented information or patterns changes or change over time due to an algorithm and/or external influences. A method for marking, identifying or authenticating objects or living beings is provide, with the living being or object being provided with a security element having an electronic display device, particularly a digital display for representing security-relevant information or patterns, whereby the represented information or patterns changes or change over time due to an algorithm and/or external influences.