Let us continue with an overview of cryptography.
In this video, we will discuss to advance asymmetric algorithms that the RNC and the development algorithm.
RSA cryptography was developed by Ron Reversed additionally and Leonhard Edelman at Massachusetts Institute
of Technology M.I.T. in 1977, Oddisee is a crypto system for public encryption, widely used for securing
sensitive data, particularly when being sent over an insecure network so that the Internet in other
cryptography, both the public and private keys can encrypt the message, while the opposite creeky
from the one used to encrypt.
The message is used to decrypt it.
Oracy implements a public system as well as digital signatures.
For public key encryption in Oddisee, encryption keys, the public when the decryption keys are not
so, so only the person with the correct decryption key can decipher an encrypted message.
The keys must be made in such a way that the decryption key may not be easily deduced from the public
encryption key.
Everyone has their own encryption and decryption keys.
For digital signatures in oracy, the receiver may need to verify that the transmitter message actually
originated from the sender.
That is the signature.
This has been using the same decryption key and the signature can be later verified by anyone using
the corresponding public encryption, key signatures therefore cannot be forged.
Also, no sign of conflict or deny having the sign of message.
On your screen, you can see the example of Irisa algorithm, but first let us have a background.
The security of the Irish logarithm has so far been validated since no one attempts to break it.
It has been successful mainly because of the difficulty affecting large numbers that there is.
And is there A and B are large prime numbers.
Sea is, however, a relatively slow algorithm.
And because of this, it is less commonly used to directly encrypt user data.
I say, as I said, is an estimate cryptographic algorithm that enables public encryption for security
transmission in this algorithm, two sets of keys are generated, public and private key.
The security of this algorithm is based on the practical difficulty of factorization, of product of
two very large prime numbers multiplying, two given by numbers to get the parties easy.
But determining the original number from the third is considered an invisible prison due to the time
it would take using even today's most powerful supercomputers.
This is called factoring problem.
Let us consider two components of this algorithm is called the seven, which is the public component,
which everybody can see, and B, which is two seven five three in our case, is the private company,
which is only reserved for the authority your public will be is equal maybe, which will be accessible
to everyone and your private key is equal be consider the as the plaintext and C as a ciphertext.
Therefore the encryption function will be directed to Ma'rib is equal to the years to seven being more
three, two, three, three.
And the decryption function will be Serres more Ebbie.
This series to two seven five three more.
Three, two, three, three.
Let us consider the example that we have to include the value 123 to include plaintext veloute.
It is 123.
Encryption of 123 will be 123 res 217 more three, two, three three which is equal to eight fifty five
to decrypt the ciphertext.
That is the value of eight fifty five.
The decryption function of eight.
Fifty five will be eight fifty first two seven five three more three two three three.
That is equal to 123.
So as of now, you must have known that if we share our private key with anyone, then it's easy to
decrypt the value there.
Therefore, the thing you should remember is that you should keep your private key secure.
In this case, your priority is to defeat Hillman.
The Hellman is a cryptographic protocol that allows two parties to establish a shirkey over an insecure
and.
Diffie and Hilman came up with the encryption method that uses only a one wavefunction.
Many algorithms that were used before for encryption could be hacked because the use functions that
were doing so if someone intercepts an encrypted message.
The information could be retrieved using the security of the message that the algorithm solves the problem
of distribution.
Actually, the filmon was independently developed a few years earlier by Malcolm Davidson of the British
Intelligence Service, but it was classified.
Deferment is a way for two parties to securely generate a key for them to encrypt data in a subsequent
conversation.
It works like this that Alice and Bobby, two people who want to have an encrypted chat, Alice and
Bob, are on separate islands and this is trying to send a box of gold.
But they do not want ever truly to be able to take the gold to protect it.
Alice is a lock and key and Bob has a different lock and key.
Alice cannot open Bob's lock and Bob cannot opens Alice Lock.
When the box is on a board through an intercepted.
Truly can open only an unlocked box and cannot break the locks of Elizabeth.
So how can I send the box of gold to Bob without truly taking the gold?
So what is the answer?
Alice puts her lock on the box and sends it to Bob, Bob then puts his lock on the box as well and sends
it back to Alice.
Alice will then unlock her lock and send it to Bob.
Bob will then unlock his lock.
And the Treadgold noticed that this doesn't stop Trudy from intercepting the bolt, cutting his own
lock on it and sending it back to Alice.
So in reality, additional security is needed to make sure Trudy is not impersonating Bob.
Therefore, Diffie 11 algorithm's comes in use in this case.
In the next lecture, will hashing with two types of fishing in the five and S.A.G..