US 12,437,117 B2
Management system that determines authenticity of contents, communication apparatus, management method, method of controlling communication apparatus, and storage medium
Daiyu Ueno, Tokyo (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Feb. 23, 2024, as Appl. No. 18/585,912.
Claims priority of application No. 2023-031655 (JP), filed on Mar. 2, 2023; and application No. 2024-001764 (JP), filed on Jan. 10, 2024.
Prior Publication US 2024/0296250 A1, Sep. 5, 2024
Int. Cl. G06F 21/64 (2013.01)
CPC G06F 21/64 (2013.01) 26 Claims
OG exemplary drawing
 
1. A management system that manages contents associated with a hash value registered in a blockchain, comprising:
at least one memory storing instructions; and
at least one processor that, upon executing the stored instructions, performs the functions of:
a reception unit configured to receive target contents as a target of authenticity determination and an identification number for identifying authentic contents used as a reference for determining authenticity of the target contents;
a determination unit configured to determine the authenticity of the target contents by comparing a hash value which is generated from the target contents and a hash value of the authentic contents indicated by the identification number, which is registered in the blockchain; and
a notification unit configured to perform notification of a result of the authenticity determination,
wherein in a case where a determination is made that the target contents are not authentic, the notification unit performs notification of information on authentic contents associated with the identification number,
wherein the target contents include predetermined data, a hash value of the predetermined data, and a signature value generated by encoding the hash value using a secret key,
wherein the determination unit compares a hash value obtained by decoding the signature value using a public key and the hash value of the predetermined data included in the target contents and determines whether or not the hash value of the predetermined data has been altered,
wherein the predetermined data includes image data generated through photographing, and thumbnail data generated by reducing the image data,
wherein the determination unit determines whether or not the image data has been altered, after determining whether or not the thumbnail data has been altered, and
wherein in a case where the determination unit determines that the thumbnail has not been altered and the image data has been altered, the notification unit performs notification of difference information obtained based on the thumbnail data and the image data.