Electronic watermark generating apparatus, electronic watermark verifying apparatus, method of generating electronic watermark, and method of verifying electronic watermark

An electronic watermark verifying apparatus comprising:

• one or more circuits operable to:
• analyze appliance characterizing information in which electronic watermark information used for detecting whether information has been tampered with or not is embedded and which is generated using physical data acquired by a sensor measuring characteristics of an electronic appliance, and specify an embedded position of the electronic watermark information, wherein the embedded position is determined using difference data generated based on different values of the appliance characterizing information;
• extract the electronic watermark information from the embedded position in the appliance characterizing information, wherein the electronic watermark information is extracted as different bit parts from the appliance characterizing information, and a bit size of each of the bit parts is less than a bit size of the appliance characterizing information;
• and
• verify the electronic watermark information.

A method of generating an electronic watermark, comprising:

• generating appliance characterizing information that characterizes an electronic appliance, using physical data acquired by a sensor that measures characteristics of the electronic appliance;
• generating, in relation to the appliance characterizing information, electronic watermark information that is used to detect whether the appliance characterizing information has been tampered with or not;
• analyzing the appliance characterizing information, and determining an embedded position for embedding the electronic watermark information in the appliance characterizing information, wherein the embedded position is determined using difference data generated based on different values of the appliance characterizing information;
• and
• embedding the electronic watermark information, wherein the electronic watermark information is embedded as different bit parts in the appliance characterizing information, and a bit size of each of the bit parts is less than a bit size of the appliance characterizing information.

A method of verifying an electronic watermark, comprising:

• analyzing appliance characterizing information in which electronic watermark information used for detecting whether information has been tampered with or not is embedded and which is generated by using physical data acquired by a sensor measuring characteristics of an electronic appliance, and specifying an embedded position of the electronic watermark information, wherein the embedded position is determined using difference data generated based on different values of the appliance characterizing information;
• extracting the electronic watermark information from a position in the appliance characterizing information in which the electronic watermark information is embedded, wherein the electronic watermark information is extracted as different bit parts from the appliance characterizing information, and a bit size of each of the bit parts is less than a bit size of the appliance characterizing information;
• and
• verifying the electronic watermark information extracted from the appliance characterizing information.