Data set controlling method for chip card, involves effectuating alert action if error code word is not associated to decrypted data words of decrypted data set otherwise control action is effectuated

摘要

The method involves obtaining an encrypted data set (20) comprising encrypted data words (201-204), and obtaining an error code word (110) associated to the data set. The encrypted data words are decrypted in order to form decrypted data words of decrypted data set. An alert action is effectuated if the error code word is not associated to the decrypted data words otherwise a control action is effectuated. The alert action comprises the correction of decrypted data words so that erroneous bits are not resounding on the data processing. Independent claims are also included for the following: (A) a circuit for controlling a data set comprising several data words (B) a utilization of a circuit in a chip card.