Program execution system, program execution method, and program

A program execution system comprising:

• a data holding apparatus including first circuitry configured to transmit a first ciphertext obtained by encrypting data with a common key, to a data processing apparatus;
• and
• the data processing apparatus that includes second circuitry configured to transmit, to the data holding apparatus, both:
• a public key corresponding to a secret key that is held in an isolated region, and
• a hash value that is obtained by applying a hash function to the public key and to which a signature is added by a hardware secret key included in hardware that implements the isolated region, wherein
• the first circuitry of the data holding apparatus is configured to transmit a second ciphertext obtained by encrypting the common key with the public key, to the data processing apparatus,
• the second circuitry of the data processing apparatus is configured to:
• acquire the common key that is obtained by decrypting the second ciphertext with the secret key, and
• acquire the data by decrypting the first ciphertext with the common key in the isolated region, and
• in the isolated region, the second circuitry of the data processing apparatus is configured to calculate a result of processing the data by a program that is held in the isolated region.