| 摘要 |
PURPOSE:To prevent data from being simply decoded by preparing plural conversion data to reconvert data by conversion data at the time of converting the data and then storing and reading out them and properly using different kinds of conversion data to write data in a data storage part. CONSTITUTION:Exclusive OR operation between data inputted from a data I/O terminal Tio and selected conversion data is executed by an exclusive OR circuit 3 and the operated result is stored in a storage element 1. At the time of reading out data, one kind of writing conversion data out of plural ones prepared in the external are set up in a converting data memory 4 through a buffer circuit 5. A prescribed address area is specified and exclusive OR operation between the data outputted from the element 1 and the selected conversion data is executed by an EXOR circuit 2 and the operated result is outputted from a data I/O terminal Tio. Consequently, the stored data can not be simply decoded by a third person. |
