Information processing apparatus, information processing system, and information processing method

An information processing system comprising:

• an information processing apparatus;
• and
• a non-volatile memory device,
• wherein the information processing apparatus comprises
• security information management circuitry that manages a plurality of pieces of unencrypted key information in plaintext;
• and
• a first controller that instructs the security information management circuitry to encrypt and decrypt data using at least one of the plurality of pieces of key information and performs control to transmit and receive the encrypted data,
• wherein the security information management circuitry comprises
• a volatile first memory that stores first key information for encrypting data to be transmitted and received and second key information for encrypting the first key information, and
• a nonvolatile second memory that stores third key information for encrypting the first key information and the second key information, and
• wherein the first controller performs control to store, before power supply voltage to the security information management circuitry is cut off, encryption information of the first key information encrypted based on the third key information and encryption information of the second key information encrypted based on the third key information in a nonvolatile third memory that is provided separately from the security information management circuitry and the first controller.

An information processing method to perform encryption processing and decryption processing of data to be transmitted and received by using at least one of a plurality of pieces of key information comprising:

• storing first key information for encrypting data to be transmitted and received and a second key information for encrypting the first key information, into a volatile first memory in a security information management circuitry;
• storing third key information for encrypting the first and second key information, into a non-volatile second memory in the security information management circuitry;
• and
• storing, after a supply of the power supply voltage to the first memory is resumed, the first key information and the second key information obtained by decrypting encryption information of the first key information and encryption information of the second key information in the third memory based on the third key information, into the first memory.