Data diddling refers to be unauthorized modification of data by dishonest employees of an organization . it is mostly done by the staff . by this modification any employee performing reconciliation can embezzle millions of money by making modification in data . he can also illegally transfer money to his account .
trapdoors - it refers to the special routines of a program which allow programmer to monitor storage area of memory or other technical details of system in order to check whether the program is performing correctly or not .