1
00:00:00,450 --> 00:00:04,710
So now let us continue to define our translate message matter.

2
00:00:04,890 --> 00:00:07,440
So this we have done in the last session.

3
00:00:07,500 --> 00:00:19,560
So now over here we are seeing the fine, your translated message SDR method, which will take the GST

4
00:00:19,830 --> 00:00:27,240
as a parameter, the message SDR as the parameter along with the Modesta, which is either a string

5
00:00:27,240 --> 00:00:33,820
of incorrupt or the that we have already passed in the encrypt messages and the decrypt messages.

6
00:00:34,140 --> 00:00:44,880
OK, so now over here in this definition, we would create see translated as the R is equal to blank.

7
00:00:45,180 --> 00:00:49,170
Now this is basically storing the encrypted or the decrypted message string.

8
00:00:49,620 --> 00:00:54,110
Then we are having the key X, which is equal to zero.

9
00:00:54,630 --> 00:01:04,460
We have the GST that's equal to the GST are thought convert to Apple and after this we run a for loop,

10
00:01:04,470 --> 00:01:07,230
OK, which will loop through each symbol in the message.

11
00:01:07,500 --> 00:01:17,010
So we are seeing for SVM in your message Estie are open for loop and your will take.

12
00:01:17,340 --> 00:01:20,910
No one is equal to similar letters.

13
00:01:20,930 --> 00:01:30,380
SDR don't find in bracket as I am thought, convert to uppercase.

14
00:01:30,660 --> 00:01:35,970
Now we have this letter Estie so that is what we are finding it over here.

15
00:01:36,090 --> 00:01:45,780
And after this we check in the if if the value of no one is not equal to minus one, then you're minus

16
00:01:45,780 --> 00:01:50,670
one means you're as brought up or was not found in the letter Oresteia.

17
00:01:51,090 --> 00:01:58,700
So then over here we are seeing if the mode SDR is equal to the value that is encrypted.

18
00:01:58,980 --> 00:02:01,170
This is another condition we are checking.

19
00:02:01,440 --> 00:02:09,750
Then we say number one C plus is equal to the letter is still not fine.

20
00:02:09,930 --> 00:02:17,760
In Blackett we give the GST up along with the key idea that is.

21
00:02:17,760 --> 00:02:24,990
And if it is encrypting it now, another check would be in the elusive part for the less dear.

22
00:02:25,260 --> 00:02:31,040
If it is equal, do not encrypt but decrypt, then we need to subtract it.

23
00:02:31,050 --> 00:02:41,100
So then we say no one is minus is equal to your we are seeing let Oresteia not find in bracket the GST

24
00:02:41,100 --> 00:02:50,550
are the key x that this subtract if it is decrypted now once this is an active part is also part is

25
00:02:50,550 --> 00:02:53,070
done we go for number one.

26
00:02:53,460 --> 00:02:58,150
Modulo is equal to the length of the letter.

27
00:02:58,200 --> 00:03:05,760
Still that is handle any wraparound if any, and then we would add the encrypted or the decrypted symbol

28
00:03:05,760 --> 00:03:09,660
to the end of the translated by seeing C here.

29
00:03:09,660 --> 00:03:19,470
If we say if I m not is in uppercase, then we see the translated SDR.

30
00:03:20,010 --> 00:03:21,980
That is the variable that we have taken.

31
00:03:22,500 --> 00:03:30,300
We are using the append matter and we are seeing letter Estey are at the index of number to be up and

32
00:03:30,720 --> 00:03:44,310
then again, which is if part and we say is am told is lower then via C C translated SDR got up and

33
00:03:44,670 --> 00:03:50,610
here we are using the letter to our index number one dot lol.

34
00:03:52,810 --> 00:04:01,630
If it doesn't look now after this, then we go ahead foreseeing the key idea X plus is equal to one

35
00:04:01,630 --> 00:04:03,050
that is moved to the next level.

36
00:04:03,080 --> 00:04:05,370
The lucky ones, this is that.

37
00:04:05,680 --> 00:04:12,960
And then you check if your E X is equal to the length of your GST up.

38
00:04:13,630 --> 00:04:17,500
If it is, then you make the X back to zero.

39
00:04:17,960 --> 00:04:22,750
Now we come for this if condition that we have written for this.

40
00:04:22,750 --> 00:04:30,160
If we are giving the A spot here, that is we are telling to open the symbol without encrypting or decrypted.

41
00:04:30,550 --> 00:04:38,310
So then we are seeing C translated as we are not up in the value of X, Y and Z.

42
00:04:38,950 --> 00:04:48,760
And then finally we are using a written statement dot join matter and we are seeing translated as still

43
00:04:48,760 --> 00:04:49,920
to be written.

44
00:04:50,410 --> 00:04:56,740
Now once this is done, then if your current program is run instead of imported as a module, we will

45
00:04:56,740 --> 00:04:57,920
call the main function.

46
00:04:57,950 --> 00:05:08,240
So here we are checking if the name on the score is equal to mean, then we are calling the main method.

47
00:05:08,620 --> 00:05:10,990
So let us again just save it.

48
00:05:10,990 --> 00:05:13,330
As already we have given the name for the file.

49
00:05:13,990 --> 00:05:18,160
Now if we try to save one and run the module.

50
00:05:19,160 --> 00:05:26,180
OK, we are getting the air on line fifty five and 16, let us find out that first.

51
00:05:26,690 --> 00:05:32,020
Let's go to line fifty five or is it is line 16.

52
00:05:32,540 --> 00:05:36,260
So let's go to line number 16 first.

53
00:05:36,830 --> 00:05:39,230
And that is over here.

54
00:05:39,650 --> 00:05:48,410
We are passing the value of my Modesta over here that's encrypted or decrypted is what we to actually

55
00:05:48,410 --> 00:05:49,030
printed.

56
00:05:49,370 --> 00:05:54,110
So let us just examine this particular value that we are printing.

57
00:05:54,110 --> 00:05:59,840
This is page this and then let us see this.

58
00:05:59,890 --> 00:06:06,020
And yeah, so we are getting this particular message that has been encrypted in this case because we

59
00:06:06,020 --> 00:06:09,510
have given the message to be encrypted and not decrypted.

60
00:06:09,830 --> 00:06:14,840
So now over here, let us go to understand the program that we have given.

61
00:06:15,200 --> 00:06:21,380
So first, let's go for setting up the modules, the constants and the main functions of the beginning

62
00:06:21,380 --> 00:06:22,190
of the program.

63
00:06:22,190 --> 00:06:29,760
If you look at over here, this starting when we had started was the important statement for the paperclip

64
00:06:29,780 --> 00:06:36,680
module and a variable called later this year was created, which holds a string of every uppercase little.

65
00:06:37,070 --> 00:06:42,500
Then we have the main function for the original cipher, and it is like the other main functions that

66
00:06:42,500 --> 00:06:45,440
we have, which we have already seen in this advanced level.

67
00:06:45,440 --> 00:06:54,740
And also to this also, it starts by defining the variables for your message, as are your key SDR and

68
00:06:54,740 --> 00:06:56,130
your Modesta.

69
00:06:56,510 --> 00:07:01,700
So then once you have understood all this, let us move ahead.

70
00:07:02,090 --> 00:07:06,760
So the user sets these variables before running the given program.

71
00:07:07,010 --> 00:07:13,280
So the encrypted or the decrypted message, depending on what my Monastir is said to, is stored in

72
00:07:13,280 --> 00:07:18,680
the variable name translated, and then it can be also printed and copied today.

73
00:07:19,700 --> 00:07:24,290
So coming to building strengths with the list upand joined process.

74
00:07:24,680 --> 00:07:27,020
Now let us understand something new in this.

75
00:07:27,230 --> 00:07:32,320
Almost all the programs that we have seen have built a string with gold in some form.

76
00:07:32,330 --> 00:07:38,840
Now that goes the program creates a variable that starts as a blank string and then adds characters

77
00:07:38,840 --> 00:07:40,490
using this string concatenation.

78
00:07:40,580 --> 00:07:46,140
Now, this is what is our previous cipher program have done with the translator Asgeir variable.

79
00:07:46,340 --> 00:07:52,160
Now we can open the interactive shell and let us try entering some details over here or something like

80
00:07:52,490 --> 00:07:57,250
we in building as is equal to lank.

81
00:07:57,380 --> 00:08:04,010
Then we say a loop cesi one in C bitin hacking.

82
00:08:05,100 --> 00:08:13,240
And then we are seeing in this, we say building is glass is equal to see one, and then we give here

83
00:08:13,260 --> 00:08:16,200
print the value of building us.