Published in International Symposium on System and Information Security, 2006
Visual document authentication is a method by which humans can check document authenticity directly, without relying on computers for cryptography. In order to be applicable, it is essential that the document is represented as an image, recognizable to humans. Representing text documents as images has a series of drawbacks, like high memory and bandwidth requirements. In this paper we present two protocols for electronic exchange of visually authenticable digital documents, one requiring high bandwidth, but easy to implement in current infrastructure, and the other with low bandwidth requirements and preservation of the original document.