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Control of the current taken by an electronic circuit used in reading the security code from a device such as a bankers card of portable telephone to mask the period during which the code is read, but to reduce the masking period
Control of the current taken by an electronic circuit used in reading the security code from a device such as a bankers card of portable telephone to mask the period during which the code is read, but to reduce the masking period
Procedure in which a masking current is applied to variations in the current taken by an electronic circuit during a fraction of the total time (ti-tj) but which includes any period where confidential data is being read from a EEPROM memory. An Independent claim is made for an electronic circuit for implementing the above procedure.
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