Verfahren zur Entdeckung inkorrekter Überschreibung gespeicherter Daten

摘要

It is aimed to determine whether or not the rewrite of a stored data has been made by a person other than the regular creator. Therefore, in storing the data, a first code is generated by converting the password and a predetermined portion of the stored data (e.g., data itself or time stamp) in a predetermined procedure, and stored in correspondence to the stored data. Thereafter, in reading the stored data, a second code is generated by converting the password and the predetermined portion of the stored data in the predetermined procedure, and the comparison is made between the generated second code and the first code stored in correspondence to the stored data to determine that the rewrite has been made if unmatched.