The present invention relates to an access authorization system comprising at least one arrangement of a plurality of microparticles. In addition to simple mechanical access controls, such as for example keys, combined mechanical and electronic access controls or wholly electronic access controls are also realized in conjunction with access authorization systems, in particular computer systems or computer networks but also access controls for buildings.
In this context, queries are made of, for example, access cards or passwords.
However, having proven problematic for electronic access controls is the fact that experts can circumvent such access controls, whereby these experts take advantage of vulnerabilities in the electronic access controls and “hack into” them.
There is thus the need to make access authorization systems even more secure, in particular to the effect of preventing or obstructing unauthorized persons from gaining access to protected systems by means of access authorization.
Color-coded microparticles consisting of a plurality of colored layers in a preselected color sequence, wherein the color sequence represents an identification code, are already known from DE 26 51 158 A1. The microparticles are thereby made of melamine-alkyd resin, whereby, for example, 7 layers of color are deposited one atop the other at a thickness of approximately 100 μm on a polyester carrier film of approximately 50 μm.
DE 198 53 764 A1 relates to a system for securing and marking products using microparticles which each have a respective plurality of color layers forming a code.