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These are the user uploaded subtitles that are being translated: 1 1 00:00:01,370 --> 00:00:02,940 From the previous lectures, 2 2 00:00:02,940 --> 00:00:05,923 we learned that when it comes to WPA and WPA2, 3 3 00:00:07,760 --> 00:00:11,130 the only packets that contain some information 4 4 00:00:11,130 --> 00:00:13,870 that can help us with cracking the key, 5 5 00:00:13,870 --> 00:00:15,633 are the handshake packets. 6 6 00:00:16,800 --> 00:00:19,010 And in the last lecture, we learned how 7 7 00:00:19,010 --> 00:00:22,403 to capture the handshake and store it in a file. 8 8 00:00:23,730 --> 00:00:27,320 Now the handshake does not contain any information 9 9 00:00:27,320 --> 00:00:32,320 that can help us to recover or recalculate the WPA key. 10 10 00:00:33,210 --> 00:00:36,030 The information in it can only be used 11 11 00:00:36,030 --> 00:00:39,920 to check whether a password is valid or not. 12 12 00:00:39,920 --> 00:00:44,200 Therefore, what we're going to do is to create a wordlist, 13 13 00:00:44,200 --> 00:00:46,910 which is basically a big text file 14 14 00:00:46,910 --> 00:00:50,280 that contains a large number of passwords. 15 15 00:00:50,280 --> 00:00:51,740 Then go through this file, 16 16 00:00:51,740 --> 00:00:53,950 go through the passwords one by one, 17 17 00:00:53,950 --> 00:00:56,250 and use them with the handshake 18 18 00:00:56,250 --> 00:01:00,653 in order to check whether this password is valid or not. 19 19 00:01:01,790 --> 00:01:05,880 You can actually download ready wordlists from the internet, 20 20 00:01:05,880 --> 00:01:07,910 but in this lecture, I wanna teach you 21 21 00:01:07,910 --> 00:01:10,520 how to create your own wordlist, 22 22 00:01:10,520 --> 00:01:13,300 and in the next lecture I'm going to explain to you 23 23 00:01:13,300 --> 00:01:16,170 how the wordlist and the handshake are used 24 24 00:01:16,170 --> 00:01:18,420 in order to recover the password, 25 25 00:01:18,420 --> 00:01:21,563 and we'll see how to do that in practice. 26 26 00:01:23,820 --> 00:01:25,380 So, in this lecture we're gonna learn 27 27 00:01:25,380 --> 00:01:29,380 how you create your own wordlist using a tool called Crunch. 28 28 00:01:29,380 --> 00:01:32,140 This is a really handy skill to have under your belt 29 29 00:01:32,140 --> 00:01:34,840 if you want to be a penetration tester, 30 30 00:01:34,840 --> 00:01:37,170 because you're gonna face a lot of scenarios 31 31 00:01:37,170 --> 00:01:40,850 where a wordlist attack can become very handy. 32 32 00:01:40,850 --> 00:01:42,490 So, using the tool is very simple. 33 33 00:01:42,490 --> 00:01:46,130 All you have to do is just put the name of the tool, 34 34 00:01:46,130 --> 00:01:49,560 and then you specify the minimum number of characters 35 35 00:01:49,560 --> 00:01:52,120 for the passwords to be generated. 36 36 00:01:52,120 --> 00:01:55,020 Then we're gonna specify the maximum number of characters 37 37 00:01:55,020 --> 00:01:55,933 for the password. 38 38 00:01:56,970 --> 00:01:59,310 Then you specify the characters 39 39 00:01:59,310 --> 00:02:01,780 that you want to generate passwords from. 40 40 00:02:01,780 --> 00:02:04,410 For example, you can put all lowercase characters, 41 41 00:02:04,410 --> 00:02:06,990 all uppercase, you can put numbers, digits, 42 42 00:02:06,990 --> 00:02:10,130 or you can just specify a smaller number 43 43 00:02:10,130 --> 00:02:11,833 to make the wordlist smaller. 44 44 00:02:12,750 --> 00:02:15,760 You can also use the option T, which is an optional, 45 45 00:02:15,760 --> 00:02:16,830 to give a pattern. 46 46 00:02:16,830 --> 00:02:19,500 So for example, let's say that you are looking at the person 47 47 00:02:19,500 --> 00:02:21,270 while they were typing their password, 48 48 00:02:21,270 --> 00:02:24,520 and you seen that the password would start with an A. 49 49 00:02:24,520 --> 00:02:26,940 So you can tell Crunch that the password 50 50 00:02:26,940 --> 00:02:28,070 will start with an A, 51 51 00:02:28,070 --> 00:02:31,830 and then give me all possible combination of passwords 52 52 00:02:31,830 --> 00:02:33,233 that start with an A. 53 53 00:02:34,300 --> 00:02:36,870 And after that, we use the -o option 54 54 00:02:36,870 --> 00:02:39,720 to specify the file name where the passwords 55 55 00:02:39,720 --> 00:02:40,720 are gonna be stored. 56 56 00:02:41,640 --> 00:02:43,400 So we have a small, little example here 57 57 00:02:43,400 --> 00:02:46,924 that'll generate a list of passwords 58 58 00:02:46,924 --> 00:02:51,170 that start from six characters to eight characters, 59 59 00:02:51,170 --> 00:02:53,260 and contain these characters right here. 60 60 00:02:53,260 --> 00:02:56,900 So it's gonna create combinations of 123abc, 61 61 00:02:56,900 --> 00:02:58,610 and a dollar sign. 62 62 00:02:58,610 --> 00:03:02,010 And it's gonna store it in a file called wordlist. 63 63 00:03:02,010 --> 00:03:05,820 And these passwords are gonna start with an A, 64 64 00:03:05,820 --> 00:03:07,480 and end with a B. 65 65 00:03:07,480 --> 00:03:09,660 And it will generate passwords based 66 66 00:03:09,660 --> 00:03:13,130 on all possible combinations between the A and the B, 67 67 00:03:13,130 --> 00:03:16,820 so all of the generated passwords will always start with A, 68 68 00:03:16,820 --> 00:03:17,773 and end with B. 69 69 00:03:19,000 --> 00:03:21,010 So let's have an example of the tool. 70 70 00:03:21,010 --> 00:03:22,770 Now the tool actually have a lot of options, 71 71 00:03:22,770 --> 00:03:24,530 other than what we've seen so far. 72 72 00:03:24,530 --> 00:03:28,053 So if you just type in man, crunch, 73 73 00:03:29,730 --> 00:03:32,130 you'll see all the options that you can set, 74 74 00:03:32,130 --> 00:03:34,200 and you'll see detailed description 75 75 00:03:34,200 --> 00:03:35,710 about all of these options. 76 76 00:03:35,710 --> 00:03:37,500 So it's actually really, really good. 77 77 00:03:37,500 --> 00:03:39,130 You can go ahead and spend some time 78 78 00:03:39,130 --> 00:03:41,400 to get familiar with the tool. 79 79 00:03:41,400 --> 00:03:42,830 Now I'm gonna show you the example, 80 80 00:03:42,830 --> 00:03:44,850 and based on the example, you'll be able to run 81 81 00:03:44,850 --> 00:03:46,000 all of these commands. 82 82 00:03:46,000 --> 00:03:50,130 But, if you want to run or create some advanced wordlists, 83 83 00:03:50,130 --> 00:03:52,430 then I highly recommend that you go over this. 84 84 00:03:53,950 --> 00:03:56,490 One of the really cool options that I wanna highlight 85 85 00:03:56,490 --> 00:03:58,513 is the -p option. 86 86 00:03:58,513 --> 00:04:02,100 The -p option tells Crunch to generate passwords 87 87 00:04:02,100 --> 00:04:04,310 that don't have repeating characters. 88 88 00:04:04,310 --> 00:04:07,410 For example, when you specify all lowercase characters, 89 89 00:04:07,410 --> 00:04:11,430 you specify abcd, it'll start by generating passwords made 90 90 00:04:11,430 --> 00:04:16,430 of aaaaaaa, and then abbbbb, and all of that. 91 91 00:04:17,500 --> 00:04:21,110 So, when you do this, Crunch will actually ignore these type 92 92 00:04:21,110 --> 00:04:23,280 of passwords, and it'll only create passwords 93 93 00:04:23,280 --> 00:04:25,750 that don't have any repeating characters. 94 94 00:04:25,750 --> 00:04:28,270 And that'll reduce the size of the wordlist 95 95 00:04:28,270 --> 00:04:31,440 from the number of characters to the power of the length, 96 96 00:04:31,440 --> 00:04:33,543 to the number of characters factorial. 97 97 00:04:34,970 --> 00:04:38,420 If you scroll down you'll actually see more examples 98 98 00:04:38,420 --> 00:04:40,930 of commands and the type of wordlists 99 99 00:04:40,930 --> 00:04:42,393 that will be created. 100 100 00:04:43,260 --> 00:04:44,950 So, again, you can have a look on these, 101 101 00:04:44,950 --> 00:04:47,640 and get yourself familiar with. 102 102 00:04:47,640 --> 00:04:49,300 Once you're done looking at the man, 103 103 00:04:49,300 --> 00:04:52,070 you can just press Q, and you'll be out of it. 104 104 00:04:52,070 --> 00:04:53,570 And we're gonna run our command here, 105 105 00:04:53,570 --> 00:04:55,083 so we're gonna use Crunch. 106 106 00:04:56,500 --> 00:04:58,470 And I want to generate passwords 107 107 00:04:58,470 --> 00:05:00,163 of minimum of six characters, 108 108 00:05:01,000 --> 00:05:03,610 and maximum of eight characters. 109 109 00:05:03,610 --> 00:05:06,793 And I want them to contain combinations of abc. 110 110 00:05:07,700 --> 00:05:10,910 And let's say the digits 1-2. 111 111 00:05:10,910 --> 00:05:13,270 Now in here you can actually keep listing things. 112 112 00:05:13,270 --> 00:05:16,260 You can list characters, you can list uppercase characters, 113 113 00:05:16,260 --> 00:05:17,943 or even symbols if you wanted to. 114 114 00:05:18,800 --> 00:05:20,530 Once you're done with listing the characters, 115 115 00:05:20,530 --> 00:05:23,090 we're gonna specify the file to save it to. 116 116 00:05:23,090 --> 00:05:26,297 And we're gonna save it in a file called test.txt. 117 117 00:05:29,790 --> 00:05:31,470 So the command is very simple. 118 118 00:05:31,470 --> 00:05:34,410 It's crunch, minimum length of the password, 119 119 00:05:34,410 --> 00:05:36,270 the maximum length of the password, 120 120 00:05:36,270 --> 00:05:38,240 followed by the characters that we want to use 121 121 00:05:38,240 --> 00:05:41,210 to generate passwords from, and then O 122 122 00:05:41,210 --> 00:05:44,890 to the file that the passwords are gonna be stored in. 123 123 00:05:44,890 --> 00:05:45,890 I'm gonna hit Enter. 124 124 00:05:47,590 --> 00:05:49,100 And as you can see, now it's telling us 125 125 00:05:49,100 --> 00:05:54,100 that it generated 448,000 passwords, approximately. 126 126 00:05:54,660 --> 00:05:57,710 And they're all stored in a file called test.txt. 127 127 00:05:57,710 --> 00:06:01,350 Now, the size of the file is four megabytes. 128 128 00:06:01,350 --> 00:06:06,350 And now I can open this file by doing cat, test.txt. 129 129 00:06:09,330 --> 00:06:11,610 And as you can see, now we can see all the passwords 130 130 00:06:11,610 --> 00:06:13,350 that have been generated. 131 131 00:06:13,350 --> 00:06:16,580 I'm gonna Ctrl+C out of it, 'cause it's a huge file. 132 132 00:06:16,580 --> 00:06:18,680 And as you can see, it actually contains 133 133 00:06:18,680 --> 00:06:22,233 all possible combinations of abc12. 134 134 00:06:24,570 --> 00:06:28,080 I also want to show you an example of using the -t option. 135 135 00:06:28,080 --> 00:06:30,810 So, I'm gonna set this to only six to six, 136 136 00:06:30,810 --> 00:06:32,740 so it's only six characters. 137 137 00:06:32,740 --> 00:06:34,510 And we're gonna use the -t option, 138 138 00:06:34,510 --> 00:06:36,350 which is the pattern option. 139 139 00:06:36,350 --> 00:06:38,650 And I'm gonna tell it that I want the password 140 140 00:06:38,650 --> 00:06:39,950 to always start with an A. 141 141 00:06:41,020 --> 00:06:44,040 And then I want you to fill all possible combinations 142 142 00:06:44,040 --> 00:06:47,890 of characters between the A, and the B. 143 143 00:06:47,890 --> 00:06:50,170 So I want passwords that start with an A, 144 144 00:06:50,170 --> 00:06:51,650 and end with a B. 145 145 00:06:51,650 --> 00:06:53,580 And in the middle, at the at sign, 146 146 00:06:53,580 --> 00:06:58,260 you can fill all possible combinations of abc12. 147 147 00:06:58,260 --> 00:06:59,113 Gonna hit Enter. 148 148 00:07:00,090 --> 00:07:03,070 As you can see now, the number of passwords is much less, 149 149 00:07:03,070 --> 00:07:07,820 it's only 625 passwords, because I've narrowed down 150 150 00:07:07,820 --> 00:07:09,800 the possibilities of passwords. 151 151 00:07:09,800 --> 00:07:14,800 Again, if I do cat, test.txt, 152 152 00:07:15,150 --> 00:07:17,903 you'll see that I have all the passwords right here. 153 153 00:07:19,920 --> 00:07:21,940 So this is it, tool is really useful. 154 154 00:07:21,940 --> 00:07:24,130 Can be used in many scenarios. 155 155 00:07:24,130 --> 00:07:26,380 I highly recommend that you spend some time with it, 156 156 00:07:26,380 --> 00:07:28,490 and also have a look on some 157 157 00:07:28,490 --> 00:07:31,113 of the existing wordlists out there on the internet. 13825