Method for verification of integrity of digital personalization data inscribed in electrical EPROM of smart card in e.g. pay TV, involves applying counter measurement program if value of verification code is different from reference value

摘要

The method involves calculating digital imprints based on octets of digital data inscribed in memory. A commutative mathematical operation is applied to a set of obtained digital imprints for calculating an integrity verification code. A value of the integrity verification code is compared with a reference value stored outside the memory. Counter measurement program is applied if the value of the integrity verification code is different from the reference value.