Three-dimensional characteristics of a complex physical structure are used to generate a unique identifier. In effect, the characteristics reperesent the basis of a "physical one-way hash function" that faciliates ready derivation of an identifier based on the physical structure, the structure itself...http://www.google.fr/patents/US6584214?utm_source=gb-gplus-shareBrevet US6584214 - Identification and verification using complex, three-dimensional structural features
Identification and verification using complex, three-dimensional structural ...
