1
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Now, when the full time the program execution goes through the particular loop, the key is still set

2
00:00:06,060 --> 00:00:06,580
to zero.

3
00:00:06,960 --> 00:00:15,490
And over here, if you look at the program initially, OK, now after this, the ciphertext in the messages

4
00:00:15,490 --> 00:00:17,830
still is decrypted with the key zero.

5
00:00:18,330 --> 00:00:24,330
Now, of course, is zero, is not really your messages are just decrypts to anything else apart from

6
00:00:24,330 --> 00:00:25,590
the exact text.

7
00:00:26,100 --> 00:00:30,090
Now, the code inside the fallout of after this.

8
00:00:30,240 --> 00:00:38,280
OK, now over here is basically similar to over see the cipher program that we have done now over here

9
00:00:38,280 --> 00:00:43,350
after the next iteration, the set to one for the decryption.

10
00:00:44,280 --> 00:00:51,180
So in the first argument where the range should start, the second argument is where the range can end

11
00:00:51,180 --> 00:00:51,360
up.

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00:00:51,600 --> 00:00:57,770
So over here, you can also give two arguments in the particular range, which will be separated by

13
00:00:57,780 --> 00:00:58,260
comma.

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00:00:58,470 --> 00:01:05,040
Now, for example, if you want to try it out, you can go back here and let's try it out in the interactive,

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00:01:05,040 --> 00:01:14,190
shall we say, for Iven in C range, we give your from Poolesville seven and for that we would put in

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00:01:14,190 --> 00:01:16,240
the value of Iven.

17
00:01:17,630 --> 00:01:23,450
So we get the value from that starting point as to when it is ending at 6:00 because we have given to

18
00:01:23,450 --> 00:01:29,210
Tacoma seven, so the variable, Ivan, over here will be the value from two, which is including two

19
00:01:29,450 --> 00:01:32,870
up to the value seven, but not including seven.

20
00:01:33,650 --> 00:01:40,300
So if we move on to the decrypting the message, but again, we'll go back to our program, not over

21
00:01:40,300 --> 00:01:46,190
here, the next for Loop, where we are creating the translator D'Astier variable, which is attached

22
00:01:46,190 --> 00:01:52,920
to blank langstrom because we would want to add the values which is decrypted in the translated STF.

23
00:01:52,970 --> 00:02:00,320
OK, so over here, the currency will be added to the decrypted text in the translated Ostia from the

24
00:02:00,320 --> 00:02:08,240
last iteration in the loop, after which we have the next that is before SVM in our message.

25
00:02:08,280 --> 00:02:14,040
Still, if the symbols or if I may never see Monastir, we are finding the particular symbol values

26
00:02:14,120 --> 00:02:14,860
over here.

27
00:02:15,320 --> 00:02:20,990
We are basically looping through every symbol in this ciphertext, the string that is stored in the

28
00:02:21,000 --> 00:02:22,010
particular messages.

29
00:02:22,490 --> 00:02:28,130
So on each iteration of this loop, we are checking whether this symbol exists in December last year,

30
00:02:28,130 --> 00:02:31,580
constant variable and if so, we are decrypting it.

31
00:02:31,880 --> 00:02:39,230
OK, so then basically we subtract the USDA from our symbol indexed to decrypt it.

32
00:02:40,040 --> 00:02:46,910
Now, after this, if we just see the next call with the subtraction operation because your translated

33
00:02:47,270 --> 00:02:50,930
X to become less than zero and require us to wrap around.

34
00:02:51,200 --> 00:02:56,930
So the symbol constant when we find the position to the characters in our SYMBOLISTIC to decrypt, we

35
00:02:56,930 --> 00:02:58,070
check for this case.

36
00:02:58,380 --> 00:03:04,670
OK, and if translated is the index is less than zero over here, then it can be modified.

37
00:03:04,670 --> 00:03:12,440
So we see the translated into X is equal to the index value plus the length of over symbolistic basically

38
00:03:12,470 --> 00:03:16,610
upending the values at the end of the translated into X.

39
00:03:17,640 --> 00:03:25,500
So moving to the next one where we are seeing here that translated Asgeir is equal to translated estar

40
00:03:25,500 --> 00:03:29,130
plus the value of symbol that is a spy.

41
00:03:29,520 --> 00:03:35,670
OK, so here we are, just adding the unmodified symbol to the end of the translated Istria.

42
00:03:35,940 --> 00:03:44,580
If the value was not found by in the Stajcic, after which we are basically using the formatting or

43
00:03:44,580 --> 00:03:47,590
string formatting to display the key and the decrypted message.

44
00:03:47,850 --> 00:03:54,930
So when we are seeing your putting key value hash percentage, one percent is percentages and the value

45
00:03:54,930 --> 00:04:02,520
of the value of translated FTA, the argument over during the print function calls is a string value

46
00:04:02,790 --> 00:04:04,080
that uses this string.

47
00:04:04,080 --> 00:04:06,920
Formatting also calls your string interpolation.

48
00:04:07,380 --> 00:04:12,990
So the string formatting with percent is text places one string inside, another one.

49
00:04:13,350 --> 00:04:19,470
The forced percentages is a string gets replaced by default value in the parentheses at the end of the

50
00:04:19,470 --> 00:04:19,810
string.

51
00:04:20,100 --> 00:04:26,990
So for example, so now we can try out some string interpolation examples in the interactive shell.

52
00:04:27,420 --> 00:04:36,530
For example, if we write down over here, say hello, placenta's exclamation mark percent.

53
00:04:37,370 --> 00:04:44,690
So close this, then we write down here, see Biton and we present there.

54
00:04:44,700 --> 00:04:45,770
Hello, Python printer.

55
00:04:46,320 --> 00:04:52,290
So after Python we get the exclamation mark because here we are saying that the string should be printed.

56
00:04:52,680 --> 00:05:05,000
Similarly, if we try out something like say hello, a space, then A plus C python, then again, a

57
00:05:05,010 --> 00:05:07,150
plus an exclamation mark.

58
00:05:08,040 --> 00:05:12,370
So we are going to get the same output, but in a different way without using percentages.

59
00:05:12,750 --> 00:05:17,070
Similarly, if we see no percentage as.

60
00:05:18,320 --> 00:05:32,690
Eight, the percentage is that it the percentage is close this, then he'll be right down the values

61
00:05:32,690 --> 00:05:41,580
which we want to substitute, that is see dog got that.

62
00:05:43,110 --> 00:05:47,820
So will get the dog eat the cat that ate the rat.

63
00:05:48,080 --> 00:05:51,790
So everywhere the walls automatically get substitutive.

64
00:05:52,310 --> 00:05:52,720
Right.

65
00:05:52,850 --> 00:06:00,950
So in the first example that we have seen here, the whole spring, that is the python is inserted into

66
00:06:00,950 --> 00:06:01,480
the string.

67
00:06:01,640 --> 00:06:02,080
Hello.

68
00:06:02,690 --> 00:06:06,680
OK, it looks as though you had concatenated be part of the string.

69
00:06:06,680 --> 00:06:13,310
The four percent is with the interpolated string and the part of the string after placenta's.

70
00:06:13,520 --> 00:06:18,350
So when you interpolate multiple strings, they replace each other in the particular order.

71
00:06:18,740 --> 00:06:25,430
String formatting is often easier to type than the string concatenation using a plus operator, especially

72
00:06:25,430 --> 00:06:26,630
for large strings.

73
00:06:26,930 --> 00:06:33,710
And unlike with the string concatenation, you can also insert the long string values such as individuals

74
00:06:33,710 --> 00:06:34,510
into the string.

75
00:06:34,880 --> 00:06:43,810
For example, if you want to try it out, something like say percentage F higher percent.

76
00:06:43,820 --> 00:06:44,210
S.

77
00:06:45,580 --> 00:06:48,780
Highs and lows this year.

78
00:06:49,150 --> 00:06:59,110
I don't see John and say fifty to fifty three, so we're inserting that integer value as a spring.

79
00:06:59,720 --> 00:07:12,640
OK, or for that example we say Jon Plus C had concatenated say fifty three again concatenate.

80
00:07:14,550 --> 00:07:23,590
And end it here, you will get an error because you cannot convert an integer object to string implicitly.

81
00:07:23,970 --> 00:07:31,850
So in the first one, the 53 integer got inserted easily in the end to the string without any issues

82
00:07:31,860 --> 00:07:33,550
when we were using the interpolation.

83
00:07:33,610 --> 00:07:38,040
But what when you tried to concatenate the integer, it will give you an error.

84
00:07:38,580 --> 00:07:46,980
OK, so now if we move on to the print value that we had in our particular program of hacking through

85
00:07:46,980 --> 00:07:47,650
the cipher.

86
00:07:48,030 --> 00:07:54,820
OK, here we have used this string formatting to create a string that has values in both the key and

87
00:07:54,820 --> 00:07:56,280
the translated variables.

88
00:07:56,550 --> 00:08:02,010
OK, because the key stores and in better value, we'll string formatting to put it in a string value

89
00:08:02,280 --> 00:08:04,630
that is passed to the print command.

90
00:08:04,860 --> 00:08:11,430
Hence we will get the key value also printed as a normal string value without any errors.

91
00:08:11,890 --> 00:08:12,720
OK, that is all.

92
00:08:12,720 --> 00:08:16,170
We have created a hacking program for the cipher.

93
00:08:17,340 --> 00:08:20,740
So in this way we have seen one example of hacking losses.

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00:08:20,790 --> 00:08:21,360
A cipher.