Communication system and communication method

A communication method of a communication system configured of an information processing apparatus and a device that perform communication,

• wherein the information processing apparatus comprises the steps of:
• storing one or more keys;
• polling-request generating of generating a polling request in which an identifier identifying the key is included;
• and
• obtaining of reading the key identified by the identifier, and decrypting encrypted data by the key to obtain a random number, the encrypted data being included in a polling response supplied from the device in response to the polling request;
• and
• wherein the device comprises the steps of:
• generating a random number;
• storing one or more keys;
• reading a key corresponding to the identifier included in the polling request;
• encrypting the generated random number by the read key;
• and
• generating the polling response including data of the encrypted random number.

An information processing apparatus that performs communication with a device, comprising:

• storage means that stores one or more keys;
• polling-request generating means that generates a polling request in which an identifier identifying the key is included;
• and
• obtaining means that reads the key identified by the identifier from the storage means, and that decrypts encrypted data by the key to obtain a random number, the encrypted data being included in a polling response supplied from the device in response to the polling request.

A communication method of an information processing apparatus that performs communication with a device, comprising:

• a reading controlling step of controlling reading of one key from one or more keys stored in storage means;
• a polling-request generating step of generating a polling request in which an identifier identifying the key is included;
• and
• an obtaining step of reading the key identified by the identifier from the storage means under control of the reading controlling step, and decrypting encrypted data by the key to obtain a random number, the encrypted data being included in a polling response supplied from the device in response to the polling request.

A program of a computer that controls an information processing apparatus that performs communication with a device, comprising:

• a reading controlling step of controlling reading of one key from one or more keys stored in storage means;
• a polling-request generating step of generating a polling request in which an identifier identifying the key is included;
• and
• an obtaining step of reading the key identified by the identifier from the storage means under control of the reading controlling step, and decrypting encrypted data by the key to obtain a random number, the encrypted data being included in a polling response supplied from the device in response to the polling request.

A recording medium having a program recorded thereon, the program causing a computer that controls an information processing apparatus that performs communication with a device to execute processing comprising:

• a reading controlling step of controlling reading of one key from one or more keys stored in storage means;
• a polling-request generating step of generating a polling request in which an identifier identifying the key is included;
• and
• an obtaining step of reading the key identified by the identifier from the storage means under control of the reading controlling step, and decrypting encrypted data by the key to obtain a random number, the encrypted data being included in a polling response supplied from the device in response to the polling request.

A device that performs communication with an information processing apparatus, comprising:

• random-number generating means that generates a random number;
• storage means that stores one or more keys;
• reading means that reads a key from the storage means, the key corresponding to an identifier for identifying the key included in a polling request from the information processing apparatus;
• encrypting means that encrypts the random number generated by the random-number generating means by the key read by the reading means;
• and
• polling-response generating means that generates the polling response including data of the random number encrypted by the encrypting means.

A communication method of a device that performs communication with an information processing apparatus, comprising:

• a random-number generating step of generating a random number;
• a reading controlling step of controlling processing for reading a key from storage means where one or more keys are stored, the key corresponding to an identifier for identifying the key included in a polling request from the information processing apparatus;
• an encrypting step of encrypting the random number generated by processing in the random-number generating step by the key whose reading has been controlled by processing in the reading controlling step;
• and
• a polling-response generating step of generating the polling response including data of the random number encrypted by processing in the encrypting step.

A program of a computer that controls a device that performs communication with an information processing apparatus, comprising:

• a random-number generating step of generating a random number;
• a reading controlling step of controlling processing for reading a key from storage means where one or more keys are stored, the key corresponding to an identifier for identifying the key included in a polling request from the information processing apparatus;
• an encrypting step of encrypting the random number generated by processing in the random-number generating step by the key whose reading has been controlled by processing in the reading controlling step;
• and
• a polling-response generating step of generating the polling response including data of the random number encrypted by processing in the encrypting step.

A recording medium having a program recorded thereon, the program causing a computer that controls a device that performs communication with an information processing apparatus to execute processing comprising:

• a random-number generating step of generating a random number;
• a reading controlling step of controlling processing for reading a key from storage means where one or more keys are stored, the key corresponding to an identifier for identifying the key included in a polling request from the information processing apparatus;
• an encrypting step of encrypting the random number generated by processing in the random-number generating step by the key whose reading has been controlled by processing in the reading controlling step;
• and
• a polling-response generating step of generating the polling response including data of the random number encrypted by processing in the encrypting step.