0214609-A2 is referenced by 22 patents and cites 2 patents.

An electronic transaction in which in order to improve a reliability of message certification by digital signature and enable the use of the digital signature in a formal transaction in place of conventional signature or seal, the following procedures are implemented utilizing the fact that, in a public key cryptograph system represented by an RSA system, a first encoded message derived by encoding a first decoded message by using a public key of a first transacting party is equal to a second encoded message derived by encoding a second decoded message by using a public key of a second transacting party: a) Check sender/receiver; b) Add content certification function c) Double check the person by the possession of a secret key and the response by a terminal; d) Add a time limit to an effective period of an electronic seal; e) Add a grace period to the electronic seal; ; and f) Send back a tally impression from the receiver to the sender.

Title
Electronic transaction method and system.
Application Number
EP19860112177 19860903
Publication Number
0214609 (A2)
Application Date
September 3, 1986
Publication Date
March 18, 1987
Inventor
Kurashiki Nobuhiro
Shiraishi Takayoshi
Sasaki Ryoichi
Takaragi Kazuo
Assignee
Hitachi
JP
IPC
H04L 09/00
H04L 09/32
H04L 09/14
H04L 09/06
G07F 07/10
G06Q 40/00
G06Q 20/00
H04L 09/00
H04L 09/32
H04L 09/14
H04L 09/06
G07F 07/10
G06Q 40/00
G06Q 20/00
H04L 09/00
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