FIELD: information technologies.
SUBSTANCE: electronic image is divided into blocks of pixels, authenticator of electronic image block is generated with application of secret authentication key, from authenticator of electronic image block digital watermark of this block is generated and inbuilt into the same block with further masking using secret masking key, specified operations are repeated for other blocks of digital image, electronic image certified with digital watermark is sent to receiver, and authenticity of received electronic image is conformed with application of secret authentication key and secret masking key.
EFFECT: improved protection of electronic image certified with digital watermark of sender against premeditated actions of violator on variation of its content.
3 cl, 9 dwg
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