METHOD OF CREATING AND CHECKING ELECTRONIC IMAGE CERTIFIED BY DIGITAL WATERMARK Russian patent published in 2010 - IPC G06K9/00 H04L9/28 H03M7/40 

FIELD: information technology.

SUBSTANCE: binary sequence of a secret identification key and a binary sequence of a secret embedding key, a cryptographic function and several Fourier coefficients of the electronic image are pre-generated for the sender and the receiver. An electronic image certified by a digital watermark is created for the sender, for which the electronic image is divided into M units with pixel size n×n. An identifier for the m-th unit of the electronic image is created. The binary sequence of the digital watermark of the m-th unit of the electronic image is determined. The digital watermark is embedded into the m-th unit of the electronic image and operations for certifying units of the electronic image for the sender with the digital watermark are repeated until completion. The receiver is sent the electronic image certified with the digital watermark. Authenticity of the electronic image received by the receiver is checked.

EFFECT: invention increases security of an electronic image certified by a digital watermark from deliberate altering of the content of the image.

3 cl, 9 dwg