Signature generating method, signature verifying method, and information processing device
AssigneeCanon Kabushiki Kaisha
InventorYuji Suga
Life of this patent
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Abstract
A method and device for verifying content using signature data for the content, where the content includes dynamically changing information. The method and device include inputting content including dynamically changing information, obtaining at least one of an upper and a lower limit of the dynamically changing information, generating target data based on the at least one of the upper and lower limits, generating signature data by attaching a signature to the target data, and verifying the signature based on the target data. The content is then verified using the signature data.
Claims20
A signature generating method comprising:
- an input step of inputting content including dynamically changing information;
- an obtaining step of obtaining at least one of an upper limit and a lower limit of the dynamically changing information;
- a target-data generating step of generating, based on the at least one of the upper limit and the lower limit, target data;
- and
- a signature generating step of generating signature data for the target-data by attaching a signature to the target data.
A signature verifying method comprising:
- an input step of inputting content containing dynamically changing information and inputting signature data for the content;
- an obtaining step of obtaining at least one of an upper limit and a lower limit of the dynamically changing information;
- a target-data forming step of forming, from the at least one of the upper limit and the lower limit, target data;
- and
- a signature verifying step of verifying the signature data based on the target data.
An information processing device comprising:
- inputting means for inputting content containing dynamically changing information;
- obtaining means for obtaining at least one of an upper limit and a lower limit of the dynamically changing information;
- target-data generating means for generating, based on the at lease one of the upper limit and the lower limit, target data;
- and
- signature generating means for generating signature data by attaching a signature to the target data.
An information processing device comprising:
- input means for inputting content containing dynamically changing information and inputting signature data for the content;
- obtaining means for obtaining at least an upper limit or a lower limit of the dynamically changing information;
- target-data forming means for forming, from the upper limit or the lower limit, target data;
- and
- signature verifying means for verifying the signature data based on the target data.
Dependencies are inferred from the claim text.