Job execution method and job execution device

A job execution method for generating second data based on first data, the method comprising:

• a key storage step for storing a private key which is necessary for encryption communication of the first data, before starting execution of a job;
• a communication step for receiving a job ID and encrypted first data;
• a job control step for controlling whether the job is to be executed, based on the job ID received in the communication step;
• a data decryption step for decrypting the encrypted first data received in the communication step;
• a data processing step for generating the second data based on the first data obtained in the data decryption step;
• and
• a log encryption step for encrypting, using a public log key, a log which shows an execution process of the job.

A job execution device for generating second data based on first data, the device comprising:

• a key storage unit configured to store a private key which is necessary for encryption communication of the first data, before starting execution of a job;
• a communication unit configured to receive a job ID and encrypted first data;
• a job control unit configured to control whether the job is to be executed, based on the job ID received by the communication unit;
• a data decryption unit configured to decrypt the encrypted first data received by the communication unit;
• a data processing unit configured to generate the second data based on the first data obtained by the data decryption unit;
• and
• a log encryption unit configured to encrypt, using a public log key, a log which shows an execution process of the job.