Computer-readable recording medium storing information processing program, information processing method, information processing device, and information processing system

1. A non-transitory computer-readable recording medium storing an information processing program that causes a computer to execute processing comprising:

creating first partial certificate information and second partial certificate information from certificate information that includes attribute information of a signer and certification information configured to certify the attribute information, based on a data amount of an electronic document, in response to a signing request for the electronic document;

generating an electronic signature for the electronic document and the first partial certificate information;

attaching the generated electronic signature to the electronic document and the first partial certificate information, and transmitting the electronic document and the first partial certificate information with the electronic signature attached to a submission source of the electronic document; and

transmitting the second partial certificate information to a verification device that verifies authenticity of the certificate information of the signer, using another route different from a route that connects the submission source and a submission destination of the electronic document.

2. The non-transitory computer-readable recording medium storing the information processing program according to claim 1 , wherein the creating includes

dividing the attribute information, the certification information, a summary value of the attribute information, and the summary value of the certification information into the first partial certificate information and the second partial certificate information such that a ratio of the data amount of the first partial certificate information to the data amount of the electronic document is equal to or less than a predetermined value.

3. The non-transitory computer-readable recording medium storing the information processing program according to claim 2 , wherein the creating includes,

among a first combination of the attribute information and the certification information, a second combination of the attribute information and the summary value of the certification information, and a third combination of the summary value of the attribute information and the summary value of the certification information, assigning the first combination or the second combination as the first partial certificate information in preference to the third combination.

4. The non-transitory computer-readable recording medium storing the information processing program according to claim 1 , wherein the certificate information is created based on attribute certificate information of the signer issued by an authentication authority.

5. The non-transitory computer-readable recording medium storing the information processing program according to claim 1 , wherein the authenticity of the certificate information of the signer is verified based on the second partial certificate information transmitted to the verification device and the first partial certificate information transmitted from the submission destination of the electronic document to the verification device.

6. The non-transitory computer-readable recording medium storing the information processing program according to claim 1 , wherein the authenticity of the electronic document is verified based on the electronic signature.

7. A computer-implemented method comprising:

creating first partial certificate information and second partial certificate information from certificate information that includes attribute information of a signer and certification information configured to certify the attribute information, based on a data amount of an electronic document, in response to a signing request for the electronic document;

generating an electronic signature for the electronic document and the first partial certificate information;

attaching the generated electronic signature to the electronic document and the first partial certificate information, and transmitting the electronic document and the first partial certificate information with the electronic signature attached to a submission source of the electronic document; and

transmitting the second partial certificate information to a verification device that verifies authenticity of the certificate information of the signer, using another route different from a route that connects the submission source and a submission destination of the electronic document.

8. An information processing device comprising:

a memory storing instructions; and

a processor, coupled to the memory, that executes the instructions to perform a process that:

creates first partial certificate information and second partial certificate information from certificate information that includes attribute information of a signer and certification information configured to certify the attribute information, based on a data amount of an electronic document, in response to a signing request for the electronic document;

generates an electronic signature for the electronic document and the first partial certificate information;

attaches the generated electronic signature to the electronic document and the first partial certificate information, and transmits the electronic document and the first partial certificate information with the electronic signature attached to a submission source of the electronic document; and

transmits the second partial certificate information to a verification device that verifies authenticity of the certificate information of the signer, using another route different from a route that connects the submission source and a submission destination of the electronic document.

9. An information processing system comprising:

a memory storing instructions; and

an information processing device, coupled to the memory, that executes the instructions to perform a process that: creates first partial certificate information and second partial certificate information from certificate information that includes attribute information of a signer and certification information configured to certify the attribute information, based on a data amount of an electronic document, in response to a signing request for the electronic document; generates an electronic signature for the electronic document and the first partial certificate information; attaches the generated electronic signature to the electronic document and the first partial certificate information, and transmits the electronic document and the first partial certificate information with the electronic signature attached to a submission source of the electronic document; and transmits the second partial certificate information to a verification device, using another route different from a route that connects the submission source and a submission destination of the electronic document; and

the verification device that: receives the second partial certificate information from the information processing device; receives the first partial certificate information from the submission destination of the electronic document; and verifies authenticity of the certificate information of the signer based on the received second partial certificate information and the received first partial certificate information.