Method for electronic transaction with digital signature

Details Method for electronic transaction with digital signature Method for electronic transaction with digital signature

1989-07-05

1991-05-21

Tarcza, Thomas H.

Cryptography

Particular algorithmic function encoding

Public key

380 23, 380 25, H04K 900

Patent

active

050181963

ABSTRACT:
A mediation can be requested to a computer connected to a communications network when transacting parties A and B effect an electronic transaction and trouble takes place during the transaction. The transaction is effected by a procedure where the transacting party B transmits its preliminary digital signature to the transacting party A. When the transacting party B agrees with the contract document M transacting part A has submitted, the transacting parties A and B exchange their formal signature with each other. These signatures are obtained by coding data including a hash total h(M) obtained by transforming the contract docmument M, identifiers of the transacting parties A and B and a data identifier indicating whether the data are prepared for the preliminary on the formal signature by the public key cryptosystem using a secrete key for one of the transaction parties. When a trouble takes place, the mediation organization decodes the signatures submitted by the transacting parties as evidences by using a public key and checks as the basic of h(M) and the identifiers of the transacting parties whether the evidence data concern the same transaction or not. Finally, it decides the sort of the signatures based on the data identifiers and deduces a conclusion of the mediation.

REFERENCES:
patent: 4658093 (1987-04-01), Hellman
patent: 4759063 (1988-07-01), Chaum
patent: 4853961 (1989-08-01), Pastor
patent: 4868877 (1989-09-01), Fischer
patent: 4881264 (1989-11-01), Merkle
patent: 4885777 (1989-12-01), Takaragi et al.
"The Use of Public Key Cryptography for Signing Checks", Proceeding of Crypto 82, Advances in Cryptoloty, Longpre, Aug. 23-25, 1982, U.S.A., pp. 191-192.
Takaragi et al., "Authentication Method for Electronic Contracts with IC Card Key Management", The Transactions of Electrical Engineers of Japan C, vol. 107-C, No. 1, Jan. 1987, pp. 46-53.
Ikeno et al., "Modern Cryptology", The Transactions of the Institute of Electronics and Communication Engineers of Japan, Sep. 1, 1986 (In Japanese).
Takaragi et al., "A Practical and Fair Protocol for Signing Contracts", Jul. 8, 1988.

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