WEBVTT 00:09.150 --> 00:14.730 Elephants to come back in this lesson they're going to learn how to secure the Grupp groups and for 00:14.770 --> 00:20.180 Grand Unified bootloader which is used to load the operating system from the disco. 00:20.400 --> 00:27.270 So protecting grub is very good in the Linux environment because there is a feature of page hacker can 00:27.270 --> 00:31.360 get you a system before actually loading the operating system. 00:31.470 --> 00:31.920 OK. 00:31.950 --> 00:35.480 So let's see how hacker can get it go system. 00:35.490 --> 00:44.100 OK he can either log in or get into the system as a single user mode or he can copy or get some important 00:44.100 --> 00:47.150 information or you could good configuration file. 00:47.280 --> 00:47.850 OK. 00:47.880 --> 00:50.440 Before actually loading the operating system. 00:50.660 --> 00:51.150 OK. 00:51.240 --> 00:56.300 So let's see how hackers can get it to art and how to protect our grub. 00:56.730 --> 00:59.080 OK I'll see here when you start. 00:59.100 --> 01:06.910 So were these pop ups here and when you press the OK we get it treated more. 01:06.920 --> 01:09.230 So hackers can get into this more. 01:09.230 --> 01:14.470 You can log in as a single user mode and when he locks in it has a single user mode. 01:14.480 --> 01:19.850 He will be the root user and he can perform any operation he can damage your system. 01:20.040 --> 01:20.550 OK. 01:20.690 --> 01:26.250 Or he can copy or collect some important information with cat come on. 01:26.420 --> 01:27.010 OK. 01:27.260 --> 01:29.030 So we need to protect. 01:29.060 --> 01:29.680 OK. 01:29.990 --> 01:33.870 Our third word to get anybody in this Ditmore. 01:34.100 --> 01:34.730 OK. 01:34.940 --> 01:38.450 So just press F then who would normally 01:42.970 --> 01:44.210 Please log in as root 01:49.440 --> 01:54.510 before actually protecting the Grug you need to install a software package Corley's GP. 01:54.760 --> 01:55.450 OK. 01:55.510 --> 01:59.170 So just get all 02:01.910 --> 02:10.630 GPL VPM either text this utility which will help to copy the text on your computer screen. 02:10.640 --> 02:13.770 OK here because I can select this with mouse. 02:13.950 --> 02:20.940 So no of those stolen GPA you need to create a password for the club. 02:21.010 --> 02:27.240 OK you can medically actually said the password in human readable form or you can create an incomplete 02:27.270 --> 02:27.820 password. 02:27.850 --> 02:35.300 So here I'm going to show you how to grade encrypted password for the grubworms so just type here. 02:35.610 --> 02:46.460 Grug was W.D. and we began to look at this create an encrypted password here for the password that you 02:46.470 --> 02:48.420 are set for drub. 02:48.490 --> 02:49.060 OK. 02:49.360 --> 02:51.330 Now this is our password. 02:51.550 --> 02:54.890 So copy the text here like this. 02:54.970 --> 02:57.500 OK up to this line glub glub. 02:57.500 --> 02:59.220 God PBK D. 02:59.690 --> 03:00.260 OK. 03:00.360 --> 03:01.980 Now it is copied. 03:02.140 --> 03:03.640 Just select these lines. 03:03.730 --> 03:14.410 And after this go to the file which is present in the directory it is the rock not the cookie list to 03:14.410 --> 03:15.330 find here. 03:15.490 --> 03:20.830 OK here for me and this custom you need to open this file. 03:21.480 --> 03:22.650 So the Scopa 03:26.490 --> 03:38.280 in here you'll need to set the username and password so that the user name just typeset use is equal 03:38.380 --> 03:42.700 to add make sure don't have any space here. 03:42.730 --> 03:43.300 OK. 03:43.430 --> 03:49.510 Between the superuser and this equal operator and here in the well called Paul the username name I'm 03:49.510 --> 03:51.900 going to set the superuser as a rule. 03:51.940 --> 03:55.020 Or you can set any user name which is present. 03:55.240 --> 03:55.920 OK. 03:56.570 --> 04:06.830 And here just provide parse word underscore BBQ you have to get in here space. 04:06.910 --> 04:09.550 You certainly know here. 04:09.760 --> 04:13.470 Just plug the middle button on your mouse. 04:13.570 --> 04:19.160 This is the buzzword which is preparing for it. 04:19.210 --> 04:24.200 Just write down the data and of the read the data. 04:24.220 --> 04:27.000 The next step is you need to update the club. 04:27.010 --> 04:34.410 So just type of deck Gruppe. 04:34.790 --> 04:35.200 OK. 04:35.210 --> 04:37.860 And of course this just reboot your machine. 04:38.030 --> 04:39.620 And let's see what happens. 04:44.110 --> 04:44.560 OK. 04:45.670 --> 04:46.860 I'm going to press the 04:50.730 --> 04:55.490 OK here you can see of pressing need is asking me to enter the username and password. 04:55.680 --> 05:03.040 OK now let's enter the password sorry center the username and here into the password. 05:04.570 --> 05:11.150 In this way you can protect the bootloader from hackers from these kinds of attacks.