Method, apparatus, system and information storage medium for wireless communication

A wireless communication apparatus provided in each of a plurality of electronic instruments for wirelessly transmitting and receiving data among said plurality of electronic instruments, said wireless communication apparatus comprising:

• communication means for performing wireless data transmission and reception with a communication apparatus of other electronic instrument;
• storage means for storing identification information and a secret algorithm of an electronic instrument to which said wireless communication apparatus belongs;
• conversion means for converting data by using identification information of the other electronic instrument and a secret algorithm of the electronic instrument to which said wireless communication apparatus belongs to transmit the converted data to the other electronic instrument through said communication means, and for reconverting another converted data transmitted from the other electronic instrument to said communication means into an original form by using identification information of the other electronic instrument and a secret algorithm of the electronic instrument to which said wireless communication apparatus belongs;
• and
• control means for sending identification information of the electronic instrument to which said wireless communication apparatus belongs toward the other electronic instrument and for receiving identification information of the other electronic instrument through said communication means before the transmission and reception of the converted data.

A wireless communication system for wirelessly transmitting and receiving data among a plurality of electronic instruments, each of said electronic instruments having identification information and a secret algorithm,

• wherein each of said electronic instruments comprises:
• first means for mutually exchanging identification information with other electronic instrument which is a partner of wireless communication before performing data communication;
• and
• second means for performing transmission and reception of encrypted data with said partner electronic instrument with which identification information has been mutually exchanged;
• and
• wherein said second means includes:
• conversion/transmission means for generating a cryptographic key by using identification information of said partner electronics instrument and a secret algorithm of each of said electronic instruments to encrypt data by a cryptographic program utilizing the cryptographic key into encrypted data which is in turn transmitted to said partner electronic instrument;
• and
• reception/decryption means for generating the same cryptographic key as the cryptographic key generated by said conversion/transmission means by using identification information of said partner electronic instrument and a secret algorithm of each of said electronic instruments to decrypt encrypted data from said partner electronic instrument by a cryptographic program utilizing the cryptographic key.

An information storage medium provide din an electronic instrument which wirelessly transmits and receives encrypted data relating to other electronic instrument, storing:

• first information including identification information and a secret algorithm of the electronic instrument to which said information storage medium is included;
• second information for exchanging mutually identification information with the other electronic instrument before wireless communication;
• and
• third information for carrying out transmission and reception of encrypted data between the electronic instrument to which said information storage medium is included and the other electronic instrument;
• wherein said third information includes:
• information for generating a cryptographic key from identification information of the other electronic instrument and a secret algorithm of the electronic instrument to which said information storage medium is included, and for encrypting data by a cryptographic program utilizing the cryptographic key to transmit encrypted data to the other electronic instrument;
• and
• information for generating the same cryptographic key from identification information of the other electronic instrument and a secret algorithm of the electronic instrument to which said information storage medium is included, and for decrypting encrypted data from the other electronic instrument by a cryptographic program utilizing the cryptographic key.