Visual Authentication of Digital Documents
Integrity and authentication of digital documents is assured, if the complete route from input to output, i. e. from Alice to Bob is safe. To assure this safety a digital document is watermarked, with the shape of the watermark known to the transmitter. This guarantees that between creation and encryption no manipulation stays undetected, because a changed final documents is recognizable by the wrong watermark. The document including the watermark is send to the receiver after successful visual verification. The receiver can check its authenticity with the two following criterions: On the one hand, directly via the embedded watermark, which a third party can not alter without detection.
– On the other hand, the duration of the transmission is used as a criterion for control. This duration is about a few seconds. This duration is too short for successful manipulation with today`s technology.
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