A Scheme for Self-Issuable E-cash Systems

ISBN-13: 9786139815531 / Angielski / Miękka / 2018 / 88 str.

Shinsuke Tamura

Opis

Although e-cash systems are widely used, currently available e-cash is not a complete replacement of real cash, e.g. authorities can know merchandise for which the e-cash was paid from information included in e-cash despite they may be secrets of the cash holders. Also, protection of e-cash from dishonest entities in offline environments is not easy. A payee of e-cash cannot determine whether the e-cash a payer is paying was used already at other places or not when databases about already used e-cash are not available for example. To completely replace real cash with e-cash, this book develops a self-issuable e-cash scheme that satisfies all essential requirements. Namely, cash holders cannot forge e-cash and only a legitimate cash holder can use its e-cash. Also, no one except cash holders themselves can know their purchases or can link their consecutive purchases. In addition, cash holders can divide their e-cash into ones of arbitrary values to pay for small purchases, they can use e-cash that was paid by others, and e-cash is protected from dishonest uses even in offline environments where databases about issued or used e-cash are not available.

O autorze

Shinsuke Tamura received B.S., M.S. and Dr. (Eng.) degrees in Control Engineering from Osaka University in 1970, 1972 and 1991 respectively. From 1972 to 2001, he worked for Toshiba Corporation, and from 2001 to 2013, he was a professor of the department of information science, University of Fukui.