Communication system, information processing device, communication method, and computer-readable medium

A communication system comprising a first information processing device, a second information processing device, and a key supply base, wherein

• the first information processing device includes:
• at least one first memory storing computer-executable instructions;
• and
• at least one first processor configured to access the at least one first memory and execute the computer-executable instructions to:
• obtain key data from the key supply base;
• encrypt first data using the key data, and generate second data in which attribute information regarding encryption is added to the encrypted first data;
• and
• upload the second data to an external device, and
• the second information processing device includes:
• at least one second memory storing computer-executable instructions;
• and
• at least one second processor configured to access the at least one second memory and execute the computer-executable instructions to:
• obtain the key data from the key supply base;
• download the second data from the external device;
• and
• identify the key data based on the attribute information included in the second data, and decrypt the first data included in the second data using the key data.