1
00:00:00,180 --> 00:00:06,130
So before going in to some algorithms, you should know about some terminology in the cryptography.

2
00:00:06,870 --> 00:00:08,540
So first one is the protection.

3
00:00:08,760 --> 00:00:11,300
This is the actual message Sender wants to send to receiver.

4
00:00:11,580 --> 00:00:15,600
So this actual message I want if I want to say hi to you, see what I say?

5
00:00:15,600 --> 00:00:15,930
Hi.

6
00:00:15,930 --> 00:00:16,300
Hello.

7
00:00:16,650 --> 00:00:23,430
That is called a text and a ciphertext is this is unintelligible text and no person cannot understand

8
00:00:23,430 --> 00:00:23,640
this.

9
00:00:23,850 --> 00:00:31,290
So I perform some operation on my plain text to decipher text and I will send this over to my receiver

10
00:00:31,950 --> 00:00:32,820
and encryption.

11
00:00:33,210 --> 00:00:37,540
The process of converting this print into ciphertext is called encryption.

12
00:00:38,070 --> 00:00:42,300
OK, the actual words I'm doing on a print is called encryption.

13
00:00:42,300 --> 00:00:44,400
After encryption, I get this over text.

14
00:00:45,650 --> 00:00:49,900
And the decryption the process of converting ciphertext into plain text is called decryption.

15
00:00:50,540 --> 00:00:58,440
So on every single said that he should perform this operation called encryption, and this process automatically

16
00:00:58,440 --> 00:01:00,110
comes with the same protection, the plaintext.

17
00:01:01,410 --> 00:01:06,600
So encryption should be performed at the central side and the convention will be performed at the site.

18
00:01:08,360 --> 00:01:14,330
And is the shadow of understanding how cryptograms works and finding weaknesses.

19
00:01:16,970 --> 00:01:26,060
This is this is exactly the crucial, but it's not capricious, don't know how this process has worked.

20
00:01:26,250 --> 00:01:28,520
I can confirm decryption, but.

21
00:01:29,540 --> 00:01:33,470
Cryptanalysis is very often training how algorithms and finding weaknesses.

22
00:01:33,680 --> 00:01:42,050
So if I use this week mathematical models are just simple mathematical model, uh, for converting the

23
00:01:42,050 --> 00:01:46,820
production design protection than any other can, just these algorithms.

24
00:01:47,030 --> 00:01:54,620
And they can just decipher their own way, even though the 100 percent decipher the text, they can

25
00:01:54,620 --> 00:01:56,010
get the intention.

26
00:01:56,030 --> 00:01:59,320
What I want to send the message to the receiver.

27
00:02:00,140 --> 00:02:04,850
So the person who does this cryptanalysis process is called cryptologist.

28
00:02:05,570 --> 00:02:07,150
So we have this to with the.

29
00:02:07,880 --> 00:02:12,980
So he's a mathematician and perished because he does not know how it works.

30
00:02:12,980 --> 00:02:19,010
But he studies the algorithm and he observes that some ciphertext, how it's being converted from the

31
00:02:19,030 --> 00:02:26,780
plaintext and by finding the weaknesses and he found he discovered the Enigma cipher that cryptanalysis

32
00:02:26,960 --> 00:02:27,440
works.

33
00:02:29,930 --> 00:02:36,590
And the first one you're going to see about different emphasis substitutions ever, so the name implies

34
00:02:36,740 --> 00:02:37,630
the substitution.

35
00:02:37,640 --> 00:02:41,350
So we are substituting something instead of our plain text.

36
00:02:42,170 --> 00:02:45,440
So these are simply some other characters.

37
00:02:45,680 --> 00:02:46,910
So these are assumptions.

38
00:02:46,910 --> 00:02:47,320
I was.

39
00:02:48,700 --> 00:02:56,110
So these obstetrician's are good, but also somewhat easy to crack, like if I put every other substitution,

40
00:02:56,350 --> 00:03:01,570
I got ASCII characters, substitution, I get so many paragraphs.

41
00:03:01,570 --> 00:03:05,350
But in that are paragraphs one paragraph, maybe overprotection.

42
00:03:06,300 --> 00:03:12,610
So this is like basic sofas and next on is blocks for these sofas operate on some breakoff bits.

43
00:03:12,930 --> 00:03:16,290
So you take some of that to do with Artie Shaw.

44
00:03:16,470 --> 00:03:18,750
And this I was operates on those bits.

45
00:03:19,380 --> 00:03:23,040
Examples are the servants and Sagara atoms.

46
00:03:25,020 --> 00:03:30,920
And Semitic and Christians, the same user at the encryption and as well as the Christians.

47
00:03:31,260 --> 00:03:32,760
So there is some key.

48
00:03:33,600 --> 00:03:37,120
You use the encryption inside and outside the so.

49
00:03:37,230 --> 00:03:43,760
So this key is very like part of this mathematical operation, performing on a plain text.

50
00:03:44,730 --> 00:03:49,470
And with this key, only the receiver can decrypt at the other.

51
00:03:51,070 --> 00:03:58,240
So one good thing about this encryption that these encryption are fading fast and also very fast for

52
00:03:58,240 --> 00:04:08,260
the future, but the disadvantages, if the key was seen or got triggered by another person, they can

53
00:04:08,260 --> 00:04:15,540
use the same key for the decryption so that you need to safely secure the key to the receiver.

54
00:04:15,600 --> 00:04:15,850
So.

55
00:04:17,040 --> 00:04:23,160
And the next one is asymmetric encryption, public use for encryption and private keys for the future.

56
00:04:23,400 --> 00:04:28,500
So in these encryption, we used to kiss one Nisga'a public and leaves.

57
00:04:28,650 --> 00:04:36,190
It can be used by anyone because public key is used for encryption only even the attacker.

58
00:04:36,190 --> 00:04:37,560
Our hacker knows this publicly.

59
00:04:37,560 --> 00:04:38,580
He cannot do anything.

60
00:04:39,840 --> 00:04:41,820
And the private key is used for decryption.

61
00:04:41,970 --> 00:04:44,010
So this is a very important key.

62
00:04:44,160 --> 00:04:45,780
You need to safely.

63
00:04:47,660 --> 00:04:53,840
Sent to the receiver or receiver should also should know already this private key is used only for the

64
00:04:53,840 --> 00:04:54,310
creature.

65
00:04:54,590 --> 00:05:01,350
If this is known by a hacker, then this encryption, since he knows the plaintext.

66
00:05:01,370 --> 00:05:05,000
So this private key should be stored securely.

67
00:05:06,730 --> 00:05:11,370
The next one, we're going to see the ARE certificate, these are difficult times to establish a clear

68
00:05:11,450 --> 00:05:12,770
connection between the two.

69
00:05:13,340 --> 00:05:19,850
So, for example, is this a certificate so that you can see this as a certificate in your website?

70
00:05:20,690 --> 00:05:21,460
Like a..

71
00:05:21,480 --> 00:05:22,980
Yes, like six years ago.

72
00:05:23,750 --> 00:05:25,370
Wondering about encryption and so on.

73
00:05:26,940 --> 00:05:33,690
So even though if you're using plaintext protocols like it should be, but if you have these SSL certificate,

74
00:05:33,930 --> 00:05:40,140
you can establish a secure connection between your secure innocence and encrypted connection between

75
00:05:40,680 --> 00:05:47,410
your so your data will go encrypted and also acrobatically the group at the receiver.

76
00:05:47,700 --> 00:05:49,430
That is a the certificate.

77
00:05:49,440 --> 00:05:53,670
And I always want to associate with it for websites.

78
00:05:54,210 --> 00:05:59,640
So these are the basic terms you need to know to get started on the cryptography.

79
00:06:00,780 --> 00:06:07,950
I think if there is another tool we have, we are coming to our next straight our next two years, then

80
00:06:07,950 --> 00:06:10,140
I will explain that in that video.