Patent ID: 8472528

Claim:
A method for marking a digital document with a digital image with manipulation recognition for video surveillance systems while inserting integrity information and at least one message, characterized in that the watermarking method comprises the steps of: converting the digital image to a converted digital image, dividing up the converted digital image into a plurality of blocks, every block having a plurality of coefficients; establishing a plurality of mapped message values for each one of the messages, a plurality of predetermined coefficients being mapped onto a vector that depends on a secret key; inserting every bit of every message into a least one of the mapped message values; establishing a plurality of mapped integrity values for the integrity information, a plurality of predetermined coefficients being mapped onto a message-dependent vector, said message-dependent vector being derived from at least one of the messages and the secret key; inserting every piece of the integrity information into at least one of the mapped integrity values; updating every predetermined coefficient that is used for establishing the mapped message values, using the inserted mapped message values, thereby achieving that the mapping of the updated predetermined message coefficients onto the secret key-dependent vector and the inserted mapped message values is identical; and updating every predetermined coefficient that is used to calculate the mapped integrity values with the inserted mapped integrity values, thereby achieving that the mapping of the updated predetermined integrity coefficients onto the message-dependent vector and the inserted mapped integrity values is identical.