| 摘要 |
<p>Information is read from a medium, such as a paper sheet, on which the information is written. The information thus read is encoded by use of encoding keys. The encoding keys are those created at each encoding or already created and reused. The encoded information is written on another paper sheet or another medium. In decoding, information is read from the medium on which the encoded information is written. The information thus read is decoded by use of the encoding keys as the decoding keys. The decoded information is written on another paper sheet or another medium. <IMAGE></p> |
