Information processing apparatus and method, program, and recording medium

An information processing method for an information processing apparatus which communicates with another information processing apparatus, the method comprising:

• generating a random number;
• generating first authentication data based on the generated random number, the first authentication data regarding the authentication of the another information processing apparatus;
• transmitting the first authentication data to the another information processing apparatus;
• receiving second authentication data regarding the authentication of the another information processing apparatus, the second authentication data being generated based on the first authentication data by the another information processing apparatus;
• decrypting the second authentication data using at least one decryption method corresponding to at least one encryption method;
• and
• verifying, based on the decrypted second authentication data and the generated random number, whether the another information processing apparatus is a valid communications partner.

A program for an information processing apparatus which communicates with another information processing apparatus, the program allowing a computer to execute the steps of:

• controlling the generation of a random number;
• controlling the generation of first authentication data based on the generated random number, the first authentication data regarding the authentication of the another information processing apparatus;
• controlling the transmission of the first authentication data to the another information processing apparatus;
• controlling the reception of second authentication data regarding the authentication of the another information processing apparatus, the second authentication data being generated based on the first authentication data by the another information processing apparatus;
• controlling the decryption of the second authentication data using at least one decryption method corresponding to at least one encryption method;
• and
• controlling the verification of, based on the decrypted second authentication data and the generated random number, whether the another information processing apparatus is a valid communications partner.

A recording medium in which a program for an information processing apparatus communicating with another information processing apparatus is recorded, the program allowing a computer to execute the steps of:

• controlling the generation of a random number;
• controlling the generation of first authentication data based on the generated random number, the first authentication data regarding the authentication of the another information processing apparatus;
• controlling the transmission of the first authentication data to the another information processing apparatus;
• controlling the reception of second authentication data regarding the authentication of the other information processing apparatus, the second authentication data being generated on the basis of the first authentication data by the another information processing apparatus;
• controlling the decryption of the second authentication data using at least one decryption method corresponding to at least one encryption method;
• and
• controlling the verification of, based on the decrypted second authentication data and the generated random number, whether the another information processing apparatus is a valid communications partner.

An information processing apparatus for communicating with another information processing apparatus, the apparatus comprising:

• a random number generating section generating a random number;
• a first authentication data generating section generating first authentication data on the basis of the random number generated by the random number generating section, the first authentication data regarding the authentication of the another information processing apparatus;
• an authentication data transmitting section transmitting the first authentication data to the another information processing apparatus;
• an authentication data receiving section receiving second authentication data regarding the authentication of the another information processing apparatus, the second authentication data being generated on the basis of the first authentication data by the another information processing apparatus;
• a decrypting section decrypting the second authentication data using at least one decryption method corresponding to at least one encryption method;
• and
• an authenticating section verifying, based on the decrypted second authentication data and the generated random number, whether the another information processing apparatus is a valid communications partner.