A value transfer system using integrated circuit cards for exchanging electronic cash in off-line transactions employs cryptographically secure message protocols. Cards are loaded each with two schemes from a series and interaction between cards determines and uses the oldest scheme shared by the cards, causing one card to switch schemes irrevocably if that common scheme is its second scheme. In this way a switch to a new scheme can migrate through the system.
申请公布号
WO9702548(A1)
申请公布日期
1997.01.23
申请号
WO1996GB01564
申请日期
1996.06.28
申请人
NATIONAL WESTMINSTER BANK PLC;EVERETT, DAVID, BARRINGTON;VINER, JOHN