| 摘要 |
PURPOSE:To attain a keyword burglary preventing mechanism in terms of software by producing a false keyword having a similar structure to a regular one through a false keyword generating means and setting said false keyword in a keyword storing area excluding a specific area. CONSTITUTION:The keyword storing areas 21-25 are provided in a RAM 16 and a specific area is decided out of these areas 21-25 for storage of a regular keyword based on the random number data given from a random number generating circuit 20 in an initialization mode of the regular keyword. The position of the specific area is stored by a position designating pointer 26 and at the same time the regular keyword is set in the specific area. Then the 8-byte false keywords are successively produced based on the random number data given from the circuit 20 and set in the keyword storing areas excluding the specific area. Thus it is difficult to decide the regular keyword even though a housing is destroyed and the contents of the RAM 16 are read out since plural keywords exist.
|
