Electrical computers and digital processing systems: support – Multiple computer communication using cryptography
Patent
1998-03-26
2000-12-26
Peeso, Thomas R.
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
713168, 713169, 713170, 380255, 380264, 380270, G06N 1700
Patent
active
061675148
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method, apparatus, system and information storage medium for a wireless communication which are used for performing the wireless transmission/reception of data among a plurality of electronic instruments.
BACKGROUND TECHNOLOGY
In the prior art, there is the probability that data wirelessly transmitted, for example, between two electronic instruments are intercepted.
To avoid this problem, one of the two electronic instruments encrypts data which is in turn transmitted to the other electronic instrument. The other electronic instrument then decrypts the encrypted data.
One of known encrypting/decrypting methods is the common-key type cryptographic system in which the encryption key used to encrypt data to be transmitted is identical with the decryption key used to decrypt the encrypted and transmitted data, this single key for encryption and decryption being kept secret. Generally, the Data Encryption Standard (DES) and the Revest-Shamir-Adleman (RSA) system are used as the known encrypting/decrypting methods. The RSA system is a public key cryptosystem in which an encryption key is publicly opened, but a decryption key is kept secret.
When DES is used to perform data transmission between two electronic instruments, both electronic instruments must know previously about the data transmission.
If a plurality of electronic instruments is used to perform the transmission/reception of data, a number of keys are required. More particularly, 45 keys are required by ten electronic instruments.
On the other hand, RSA requires a system for previously registering the public keys. Such a system causes to increase the installation cost or the like. Further, the data processing by RSA is slow.
SUMMARY OF THE INVENTION
In view of such problems, an object of the present invention is to provide a method, apparatus, system and information storage medium for performing wireless transmission/reception of encrypted data without previous provision of any cryptographic key and without any system for registering a cryptographic key.
According to a first aspect of the invention, there is provided a wireless communication method for wirelessly transmitting and receiving data among a plurality of electronic instruments, each of the electronic instruments having identification information and a secret algorithm, the wireless communication method comprising: electronic instruments in the plurality of electronic instruments, before data communication is performed between the two electronic instruments; and instruments; instruments converts data to be transmitted by using a secret algorithm of the one of the two electronic instruments and identification information of the other electronic instrument, and sends the converted data to the other electronic instrument; and receives and reconverts the converted data by using a secret algorithm of the other electronic instrument and identification information of the one of the two electronic instruments.
The converted data may be encrypted data.
In in the conversion/transmission step, the one of the two electronic instruments may generate a cryptographic key by using a secret algorithm of the one of the two electronic instruments and identification information of the other electronic instrument to encrypt data by a cryptographic program which utilizes the cryptographic key; and generate a cryptographic key by using a secret algorithm of the other electronic instrument and identification information of the one of the two electronic instruments to decrypt the encrypted data by a cryptographic program which utilizes the cryptographic key.
According to a second aspect of this invention, there is provided a wireless communication apparatus provided in each of a plurality of electronic instruments for wirelessly transmitting and receiving data among the plurality of electronic instruments, the wireless communication apparatus comprising: with a communication apparatus of other electronic instrument; of an electronic instrument to which
REFERENCES:
patent: 5016276 (1991-05-01), Matumoto et al.
Menezes et al., "Handbook of Applied Cryptography", 1965, pp. 491, 497, 498.
T. Matsumoto et al., "Key Predistribution System*, Key Sharing without Communication: The Key Predistribution Systems," Transactions of Inst. of Electronics, Inform. and Comm. Engineers A, vol. J71-A, No. 11, 1988, pp. 2046-2053.
S. Miyafuchi, "Does KPS Protect Privacy?", Electronics, Sep. 1995, pp. 51-53.
T. Matsumoto et al., "A Prototype KPS and Its Application-IC Card Based Key Sharing and Cryptographic Communication," Transactions of Institute of Electronics, Inform. and Comm. Engineers, vol. E73, No. 7, 1990, pp. 1111-1119.
T. Matsumoto et al., "Sharing of Encryption Key, Key Sharing System KPS for Large-Scale Networks and Its Realization," Technical Research Report of IEICE, vol. 89, No. 482, (ISEC89-52), 1990, pp. 33-47.
M. Yamai, "Ethernet and TCP/IP," Open Design, vol. 1, No. 3, 1994, pp. 1-32 .
Hoshina Masaki
Kobayashi Michio
Matsui Tetsuya
Peeso Thomas R.
Seiko Epson Corporation
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