Verbindungsherstellung zwischen Computern beruhend auf der Dekodierung einer steganographisch in einem Audioobjekt eingebetteten Adresse

摘要

The security of various documents, e.g. passports, is enhanced by hiding machine-detectable multi-bit information within an image on the document, and later using such information for document authentication. The hidden information may correlate, for example, with textual information printed on the document. Photo-swapping and other forgery problems are thereby redressed.