WEBVTT 1 00:02.450 --> 00:03.050 Welcome back. 2 00:03.080 --> 00:04.280 We now continue. 3 00:05.000 --> 00:07.580 So we have already fished out the first three characters. 4 00:08.000 --> 00:11.960 And then now we entered the first three characters correctly, 932. 5 00:11.990 --> 00:14.060 The fourth character, fifth, and so on. 6 00:14.060 --> 00:15.020 We still don't know. 7 00:15.020 --> 00:18.620 So we click okay now, and hits our breakpoint. 8 00:19.130 --> 00:20.480 Continue to step over. 9 00:22.150 --> 00:24.910 Now it's comparing the first character, which is nine. 10 00:25.300 --> 00:26.260 This is correct. 11 00:27.070 --> 00:31.720 And then now it's comparing the second character, which is three. 12 00:31.750 --> 00:33.640 So we are here, nine, three. 13 00:34.750 --> 00:35.980 Continue stepping. 14 00:37.060 --> 00:38.320 Now it's going to look back up. 15 00:40.340 --> 00:44.390 Now is comparing the third character, which is two, which is over here. 16 00:44.390 --> 00:47.420 So now we are going to look for the fourth character. 17 00:48.050 --> 00:49.550 So we continue to step. 18 00:52.520 --> 00:53.900 And over here, click on this. 19 00:53.900 --> 00:59.390 You see that we entered the fourth character as four, but it is looking for two. 20 00:59.840 --> 01:05.870 So the fourth character of the serial key, of the serial number, is two. 21 01:06.710 --> 01:07.100 Okay. 22 01:07.100 --> 01:10.370 So now we run, and it shows the bad message. 23 01:11.970 --> 01:22.590 Run again, and this time we are going to enter 9322, 9322, and replace the four with two, and hit okay. 24 01:22.620 --> 01:26.400 This time we are targeting the fifth character, hits our breakpoint. 25 01:29.700 --> 01:30.720 Nine. 26 01:36.040 --> 01:37.120 Three. 27 01:39.970 --> 01:40.900 Look back. 28 01:42.960 --> 01:44.040 Two. 29 01:49.560 --> 01:50.490 Two again. 30 01:50.490 --> 01:51.780 So we got 9322. 31 01:51.780 --> 01:53.850 Now we're going to look for the fifth character. 32 01:54.540 --> 01:58.530 So we step over, look backwards. 33 02:00.690 --> 02:01.710 This is the fifth character. 34 02:01.710 --> 02:02.820 Let's see what it is. 35 02:02.850 --> 02:06.960 We enter five as the fifth character, but it is looking for seven. 36 02:06.960 --> 02:12.120 So seven is our fifth character of the serial key. 37 02:13.110 --> 02:18.120 Now we run, and it shows the bad message. Run again. 38 02:18.330 --> 02:24.570 This time we enter 932279, 932279. 39 02:24.570 --> 02:27.180 So the fifth character we have just fished out is seven. 40 02:28.680 --> 02:30.720 The sixth character is our next target. 41 02:30.720 --> 02:31.620 So we hit enter. 42 02:31.620 --> 02:34.410 Now hit our breakpoint. 43 02:37.020 --> 02:37.980 Nine. 44 02:43.580 --> 02:44.690 Three. 45 02:50.520 --> 02:51.630 Two. 46 02:56.510 --> 02:57.470 Two. 47 03:00.620 --> 03:01.130 Look. 48 03:03.770 --> 03:04.580 Seven. 49 03:04.580 --> 03:06.500 So we are now at seven character. 50 03:06.530 --> 03:07.610 We are now at the fifth character. 51 03:07.610 --> 03:09.560 Next one is going to be the sixth character. 52 03:11.970 --> 03:15.630 Continue stepping and let's check it out. 53 03:16.560 --> 03:19.230 So the sixth character, we entered six. 54 03:19.230 --> 03:22.260 But it is checking for nine. 55 03:22.260 --> 03:24.780 So that means the sixth character should be nine. 56 03:26.220 --> 03:32.310 Okay, so we run, that message shows, run again. 57 03:32.310 --> 03:40.680 And now we are going to enter 932279, 932279, and change the sixth character to nine. 58 03:41.520 --> 03:45.240 Next one we are going to target the seventh character over here. 59 03:45.240 --> 03:46.260 Click okay. 60 03:46.590 --> 03:47.880 We hit our breakpoint. 61 03:48.570 --> 03:50.400 Now we continue to step over. 62 03:51.330 --> 03:52.590 This is nine. 63 03:57.200 --> 03:58.370 Three. 64 04:04.710 --> 04:05.670 Two. 65 04:10.690 --> 04:11.800 Two. 66 04:18.490 --> 04:19.510 Seven. 67 04:19.510 --> 04:20.830 Okay, so we've got this. 68 04:20.950 --> 04:21.610 Seven. 69 04:21.610 --> 04:22.720 Next one is nine. 70 04:28.050 --> 04:28.710 Nine. 71 04:28.710 --> 04:29.190 Correct. 72 04:29.190 --> 04:32.250 So now we are going to look for the seventh character. 73 04:32.250 --> 04:33.630 So let's step over. 74 04:35.830 --> 04:36.550 Loop. 75 04:38.900 --> 04:43.100 Click on this, and the seventh character is a null terminator. 76 04:43.100 --> 04:45.080 - is zero. 77 04:45.170 --> 04:50.180 If this were a character, you have it will have a quote, a single quote, but it is not. 78 04:50.210 --> 04:52.280 Therefore, this is a null terminator. 79 04:52.280 --> 05:01.640 That means our serial key is only 932279, 932279, because the seventh character is a null terminator. 80 05:01.760 --> 05:04.910 So now we have already fished out the serial password. 81 05:04.940 --> 05:08.810 Okay, so let's run this, and we are going to test it. 82 05:08.810 --> 05:11.180 Now click on this, run again. 83 05:12.110 --> 05:20.450 And we are going to delete all the back one and just leave 932279, 932279. 84 05:20.450 --> 05:20.990 Sorry. 85 05:21.350 --> 05:24.890 So let's click okay now to see whether it's right. 86 05:25.820 --> 05:27.560 Here's our breakpoint, run again. 87 05:28.370 --> 05:31.130 And we got the good message. 88 05:31.130 --> 05:31.790 Good work. 89 05:31.850 --> 05:38.570 So this is how we can do a deep loop tracing to fish out the serial key. 90 05:38.840 --> 05:40.790 That's all for this video. 91 05:40.790 --> 05:45.500 In the next one, we will try to do a patching to always show the good message. 92 05:45.500 --> 05:49.820 No matter what the serial key, you give it a try first before you watch the next one. 93 05:49.820 --> 05:50.690 Thank you.