| 摘要 |
<p>A pseudo random number generation device (100) generates a pseudo random number as follows. In C.2, S1[B4<SUB>1</SUB>] is decided from B4<SUB>1</SUB> set in a second internal memory, and S2[B4<SUB>0</SUB>] is decided from B4<SUB>0</SUB>. R[J] is generated from S1[I], S1[B4<SUB>1</SUB>], and S2[B4<SUB>0</SUB>]. In C.3, S1[I] is newly generated according to S1[B4<SUB>1</SUB>] and S2[B4<SUB>0</SUB>]. In C.4, B4 is updated from S2(I). In the aforementioned process, the association of R[J] with S2(I) is cut off and it is difficult to estimate S2(I) from R[J], which increases the safety. Moreover, the S1[I], S1[B4<SUB>1</SUB>], S2[B4<SUB>0</SUB>], and the like are four-byte codes and processing speed can be increased.</p> |
