1 2a 3abc 4message digest 5abcdefghijklmnopqrstuvwxyz 6ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 712345678901234567890123456789012345678901234567890123456789012345678901234567890 8