公开(公告)号：JPH10214177A

公开(公告)日：1998-08-11

申请号：JP22883097

申请日：1997-08-11

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUN

Inventor： UN SON GYON ,  ZO HYON SUKU ,  KIM CHORU

IPC: G06F7/58 ,  G09C1/00 ,  H04K1/02

Abstract: PROBLEM TO BE SOLVED: To provide a method for generating random numbers sensitive to the initial value and hard to find the periodicity, by selecting pseudo random numbers through a filter defined as a nonlinear multidimensional chaos function from stored random numbers and outputting them. SOLUTION: Many multidimensional chaos functions are defined by a nonlinear function and the nonlinear multidimensional functions are stored inside a library 10. In the selection of decision algorithm in the chaos functions stored in the library 10, by extending a key space, stability is provided. The result value 3 of the nonlinear multidimensional function selected and repeatedly applied as the decision algorithm from the nonlinear function library 10 is selected and outputted as the random number 4 by being passed through the filter 20. The filter 20 is realized by the nonlinear multidimensional function driven by the system variable of time or the like and a user key, etc., and the random number 4 is safely secured in random number selection.