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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 .
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