1 00:00:00,740 --> 00:00:01,770 Welcome back. 2 00:00:02,360 --> 00:00:04,100 In our next Cochimi. 3 00:00:05,240 --> 00:00:18,500 We see three, we are going to take a look at how to use the understanding of ASCII code and hex numbers 4 00:00:18,980 --> 00:00:19,750 to solve it. 5 00:00:21,000 --> 00:00:23,340 So if you want to give it a try. 6 00:00:24,650 --> 00:00:27,910 Please post the video and give it a try. 7 00:00:30,090 --> 00:00:33,940 So this is how I solve it. 8 00:00:35,760 --> 00:00:40,680 Jesse Tree into our session one. 9 00:00:43,680 --> 00:00:47,640 It is detected in Alphabet City form, which. 10 00:00:53,030 --> 00:00:57,080 This is a result of the import. 11 00:01:00,650 --> 00:01:01,060 OK. 12 00:01:04,380 --> 00:01:11,670 Directory into the browser to begin the process of analysis. 13 00:01:16,070 --> 00:01:20,540 Yes, to analyze, analyze. 14 00:01:25,160 --> 00:01:26,920 Watch the bottom right corner. 15 00:01:30,910 --> 00:01:39,580 To see when it has completed now, it has completed the analysis heading over to the symbol's table 16 00:01:39,580 --> 00:01:45,310 and expand on the functions folder and look for the main function. 17 00:01:49,230 --> 00:01:55,350 Head over to the decompiled window, and this is your main function. 18 00:01:57,580 --> 00:02:02,260 Let's change the signature of the main function. 19 00:02:09,310 --> 00:02:17,350 It is raining, this first barometer has Occy and his second parameter. 20 00:02:20,310 --> 00:02:25,800 As China starts to her movie. 21 00:02:32,730 --> 00:02:34,320 Now we will try to run. 22 00:02:35,840 --> 00:02:36,950 The me. 23 00:02:41,080 --> 00:02:47,590 Quota register and open you, Craney. 24 00:02:50,370 --> 00:02:51,780 Open the terminal here. 25 00:02:54,730 --> 00:02:56,590 And let's run see three. 26 00:03:00,320 --> 00:03:07,820 S. three without any parameters, will you the string please provide the secret password? 27 00:03:10,840 --> 00:03:17,230 Go back to your browser and you will see. 28 00:03:18,960 --> 00:03:31,500 Yet see three, if they ran any parameter, were you this message, please provide the secret passageway, 29 00:03:33,570 --> 00:03:34,870 take on the terminal. 30 00:03:34,890 --> 00:03:38,880 Again, this is because of the check here. 31 00:03:42,250 --> 00:03:55,300 If oxes not do, then he was sure this message so because Occy in this case is the one, so this condition 32 00:03:55,300 --> 00:04:09,520 is not satisfied and he jumped to the Aspen to show this message now to provoke an argument three days 33 00:04:11,590 --> 00:04:13,950 and now you see a different string. 34 00:04:14,710 --> 00:04:20,560 This time he has satisfied recognition Huaxi oxys do. 35 00:04:21,820 --> 00:04:22,900 So this is true. 36 00:04:23,990 --> 00:04:25,810 And so it enters the block. 37 00:04:26,380 --> 00:04:29,140 And thus these instructions. 38 00:04:30,130 --> 00:04:34,180 The first line you can the string string. 39 00:04:43,200 --> 00:04:53,360 Then over here, he start to streamline to this variable as to therefore we know that as far to is a 40 00:04:53,360 --> 00:04:55,610 length that's renaming. 41 00:04:59,880 --> 00:05:00,630 To link. 42 00:05:05,980 --> 00:05:09,390 One is the barometer pass. 43 00:05:11,530 --> 00:05:16,260 To the program, which is destroying a. 44 00:05:20,220 --> 00:05:22,230 Even the 90s, less than five. 45 00:05:24,040 --> 00:05:28,000 Then you show the strain, which is appearing here. 46 00:05:30,110 --> 00:05:35,850 Not the length of our stream history, so this is true. 47 00:05:36,290 --> 00:05:37,940 That is why it is showing this. 48 00:05:39,790 --> 00:05:42,010 So that is try now with a lengthy. 49 00:05:43,400 --> 00:05:43,930 Fi. 50 00:05:46,580 --> 00:05:53,240 Since it is expecting in the to be five characters a month. 51 00:05:58,650 --> 00:06:06,820 So we type in five days, and this time you get a different string as the message. 52 00:06:08,970 --> 00:06:14,900 So in this case now this test is false. 53 00:06:15,210 --> 00:06:22,370 So it gives the F effa and goes to the L spot and perform the second test. 54 00:06:24,160 --> 00:06:29,110 Now, in the second test, you minus this. 55 00:06:30,610 --> 00:06:31,330 From here. 56 00:06:33,020 --> 00:06:37,520 And see whether the result is zero two zero. 57 00:06:40,740 --> 00:06:43,100 So it is trying to straight. 58 00:06:44,680 --> 00:06:47,680 The character of your password. 59 00:06:50,240 --> 00:06:54,530 And then minus that from the fourth character, your pursuing. 60 00:06:56,450 --> 00:07:05,780 And check to see whether the result is six two zero zero two zero is hexadecimal. 61 00:07:07,980 --> 00:07:10,200 We can convert it into 62 00:07:13,770 --> 00:07:14,430 decimal. 63 00:07:18,400 --> 00:07:21,580 By using programers calculator. 64 00:07:26,620 --> 00:07:33,910 So send a hex to zero, convert into decimal, he's 32. 65 00:07:36,550 --> 00:07:39,850 That means he is taking the third character. 66 00:07:41,330 --> 00:07:47,420 Minus the fourth character and see whether the result is three to. 67 00:07:49,520 --> 00:08:00,590 So how can that character minus for character give you the key to the answer is if the third character 68 00:08:00,830 --> 00:08:01,880 is an alpha, but. 69 00:08:04,040 --> 00:08:06,780 And fourth character is also enough of it. 70 00:08:07,670 --> 00:08:15,610 So in an effort, but minus in an effort, it means that we are minus the ethical. 71 00:08:18,060 --> 00:08:21,990 Every character is encoded, the esky could. 72 00:08:27,180 --> 00:08:34,020 So the corrective for every effort, but has a corresponding as equal as you can see. 73 00:08:36,880 --> 00:08:50,090 So if your first character is 97, 97 minus, what gives you the right to that is the equation we need 74 00:08:50,090 --> 00:08:50,550 to solve. 75 00:08:52,130 --> 00:08:55,760 If he was scary, he did the character here, he's a. 76 00:08:57,840 --> 00:09:00,600 And if there is a question mark. 77 00:09:02,210 --> 00:09:04,400 So a minus Kushima. 78 00:09:06,310 --> 00:09:13,270 What can I tell you, this question might be so that you can get ready to if you look at Ezgi court, 79 00:09:14,620 --> 00:09:16,720 he is 97. 80 00:09:17,760 --> 00:09:21,120 So 97 minus, what gives you the two? 81 00:09:22,440 --> 00:09:32,160 You can solve it as a equation, so in order to know what is a question that we can solve in this way, 82 00:09:32,760 --> 00:09:36,360 the question now is how close to a minus 32? 83 00:09:37,350 --> 00:09:43,650 And that gives you capital a hole here, capital a 65. 84 00:09:44,980 --> 00:09:46,210 He's 37. 85 00:09:47,220 --> 00:09:50,760 Ninety seven ministry to give you a 65. 86 00:09:53,060 --> 00:09:56,600 So maybe seven. 87 00:09:58,600 --> 00:09:59,620 Minus. 88 00:10:00,870 --> 00:10:06,720 Thirty to give you sixty five. 89 00:10:09,250 --> 00:10:16,150 So Acidify, you look at capital, he saw the Soviet. 90 00:10:19,330 --> 00:10:23,440 A my question, my hostility to is actually. 91 00:10:24,450 --> 00:10:29,460 A minus capital here that gives you 30 to. 92 00:10:32,020 --> 00:10:34,540 So using this and placing Bane here. 93 00:10:36,310 --> 00:10:45,790 That character is lowercase, a fourth character, his advocacy, and we get this as a part of it. 94 00:10:48,400 --> 00:10:52,660 One, two, three, four, five. 95 00:10:56,170 --> 00:10:58,720 What is important is these two. 96 00:11:01,410 --> 00:11:06,170 One in two, four and five can be any number or any character. 97 00:11:06,240 --> 00:11:07,140 He doesn't matter. 98 00:11:17,300 --> 00:11:25,160 What matters is that your third character, minus the fourth character, must be two. 99 00:11:25,770 --> 00:11:26,000 Yeah. 100 00:11:26,900 --> 00:11:28,810 So you can have more than one answer. 101 00:11:30,310 --> 00:11:32,810 It doesn't have to be a Alberghetti. 102 00:11:34,090 --> 00:11:41,350 He could also see other combinations of ASCII character so long as the difference between them is that 103 00:11:41,350 --> 00:11:41,750 he too. 104 00:11:43,510 --> 00:11:45,720 So let's try this out to see if he's going. 105 00:11:47,380 --> 00:11:49,830 I will try this again. 106 00:11:52,650 --> 00:12:04,320 This time, I'm going to put one to Will Casey Casey for fun, and this time you see a different message 107 00:12:05,700 --> 00:12:07,410 which is coming from here. 108 00:12:08,750 --> 00:12:10,560 Correct you, Figueredo? 109 00:12:12,430 --> 00:12:21,880 So this is how we can use the understanding of Sakiko and Hex numbers in order to solve this, correct 110 00:12:21,880 --> 00:12:22,180 me. 111 00:12:23,770 --> 00:12:25,960 That is all for this video. 112 00:12:26,500 --> 00:12:27,700 Thank you for watching.