公开(公告)号：DE19600081C2

公开(公告)日：1999-11-18

申请号：DE19600081

申请日：1996-01-03

Applicant: IBM

Inventor： BUBLITZ HERRMANN R ,  HAENEL WALTER ,  RINDTORFF KLAUS

IPC: G06F11/00 ,  G06F11/14 ,  G07F7/10 ,  G06F12/16 ,  G06F17/60 ,  G06K19/07

Abstract: A method and a system are proposed for increasing the data integrity on smartcards. In accordance with the invention a sequence of write processes on a smartcard is defined as a unit for which the integrity of the data to be written is ensured. The write process may involve the writing of data to one or more files. The data of an integrity unit i.e. a unit of data for which the integrity is to be ensured is preferably written to shadow memory. The method in accordance with the invention decreases considerably the likelihood that data will be corrupted through an error in writing the data on the smartcard. Data can be restored or completed through the interface of read-write units. The method in accordance with the invention can serve as a basis for maintaining data files external to the smartcard consistent with data on the smartcard.