An Image Encryption Algorithm Based on Hyperchaotic System and Variable-Step Josephus Problem

Table 1

32 cases in the 2-bit binary numbers addition and subtraction rules.

+	00	01	10	11	−	00	01	10	11
00	00	01	10	11	00	00	11	10	01
01	01	10	11	00	01	01	00	11	10
10	10	11	00	01	10	10	01	00	11
11	11	00	01	10	11	11	10	01	00