EP 0224639 B1 19910724 - METHOD TO CONTROL THE MEMORY ACCESS OF AN IC CARD AND IMPLEMENTING DEVICE
Title (en)
METHOD TO CONTROL THE MEMORY ACCESS OF AN IC CARD AND IMPLEMENTING DEVICE
Publication
Application
Priority
DE 3524371 A 19850708
Abstract (en)
[origin: US4819204A] A method for controlling memory access to a user area and an initial code area of a main memory of a chip card includes carrying out an internal release procedure with a data comparison of an initial code from the initial code area and a data word from a terminal; firmly coupling addresses of the main memory and of a control memory to each other; marking several storage locations of the main memory as the initial code area with one control bit at a time in the control memory; marking a first code deposited in the associated storage location of the first code area as activated or deactivated with one further control bit at a time in the control memory; generating an initial release signal in a release procedure only if a storage location is addressed by an activated initial code and if agreement with the data word entered by the terminal prevails; and preventing generation of the initial release signal if a deactivated code word is addressed and/or if the respective first code does not agree with the data word, and an apparatus for carrying out the method.
IPC 1-7
IPC 8 full level
B42D 15/10 (2006.01); G06F 12/14 (2006.01); G06F 21/02 (2006.01); G06F 21/24 (2006.01); G06F 21/60 (2013.01); G06F 21/62 (2013.01); G06K 17/00 (2006.01); G07F 7/10 (2006.01)
CPC (source: EP US)
G07F 7/1008 (2013.01 - EP US)
Citation (examination)
EP 0127809 A1 19841212 - SIEMENS AG [DE]
Designated contracting state (EPC)
AT CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0224639 A1 19870610; EP 0224639 B1 19910724; AT E65632 T1 19910815; DE 3680476 D1 19910829; JP S6210745 A 19870119; US 4819204 A 19890404
DOCDB simple family (application)
EP 86108602 A 19860624; AT 86108602 T 19860624; DE 3680476 T 19860624; JP 15591586 A 19860702; US 88222286 A 19860707