Data management system

A data management method comprising:

• receiving, by a data management system, a status update request in which a target is specified, wherein
• the status update request includes:
• a first argument group that is one or more arguments used for first processing,
• an argument group summary that is a summary of the first argument group, and
• an electronic signature on the argument group summary,
• executing, by the data management system, first tamper-evidence processing of detecting whether the argument group summary in the status update request is tampered with, by using the electronic signature in the status update request,
• executing, by the data management system, second tamper-evidence processing of, when no tampering is detected in the first tamper-evidence processing, detecting whether the first argument group in the status update request is tampered with, by using the argument group summary where the no tampering is detected, and
• executing, by the data management system, status update processing of updating a status of the target specified in the status update request, when no tampering is detected with the first argument group in the second tamper-evidence processing, wherein
• the status update processing includes transaction processing that is processing of updating first information and second information in an ACID (Atomicity, Consistency, Isolation, Durability) transactional manner,
• the first information is a first object group for the target,
• the first object group is one or more first objects,
• a first object from among the one or more first objects is mutable data that represents the status of the target,
• the second information is a second object group for the target,
• the second object group is one or more second objects, and
• a second object from among the one or more second objects is tamper-evident data,
• the transaction processing includes
• first processing of creating, updating, or deleting the first object corresponding to the specified target, and
• second processing of adding the second object including at least one of a content of the first processing and a summary of the first object to the second object group corresponding to the specified target.

A computer program product comprising a non-transitory storage medium that stores instructions which cause a computer to execute:

• receiving a status update request in which a target is specified,
• the status update request including:
• a first argument group that is one or more arguments used for first processing,
• an argument group summary that is a summary of the first argument group, and
• an electronic signature on the argument group summary;
• executing first tamper-evidence processing of detecting whether the argument group summary in the status update request is tampered with, by using the electronic signature in the status update request;
• executing second tamper-evidence processing of, when no tampering is detected in the first tamper-evidence processing, detecting whether the first argument group in the status update request is tampered with, by using the argument group summary where the no tampering is detected;
• and
• executing status update processing of updating a status of the target specified in the status update request, when no tampering is detected with the first argument group in the second tamper-evidence processing, wherein
• the status update processing includes transaction processing that is processing of updating first information and second information in an ACID (Atomicity, Consistency, Isolation, Durability) transactional manner,
• the first information is a first object group for the target,
• the first object group is one or more first objects,
• a first object from among the one or more first objects is mutable data that represents the status of the target,
• the second information is a second object group for the target,
• the second object group is one or more second objects, and
• a second object from among the one or more second objects is tamper-evident data, the transaction processing includes:
• first processing of creating, updating, or deleting the first object corresponding to the specified target, and
• second processing of adding the second object including at least one of a content of the first processing and a summary of the first object to the second object group corresponding to the specified target.