Let us continue with the cryptography section in this video.
I am going to cover similar to key cryptography or asymmetric encryption, and I will give you a real
live example with Alice and Bob Symmetric, key cryptography or asymmetric encryption, the type of
encryption scheme in which the same key is used both to encrypt and decrypt the messages.
Such a method of encoding information has been largely used in the past decades to facilitate secret
communication between governments and militaries.
Nowadays, similar algorithms are widely applied in various types of computer systems.
Glennon's data security.
Now I would like to explain you symmetric encryption with a real life example of Alice and Bob.
Consider at least one to send a private image to Bob, and the only easy way to communicate is via postal
M..
Unfortunately, Alice is pretty much sure that the postman is reading the mail she sends.
This makes Alice said.
So she decides to find a way to send a message to Bob without anyone else being able to read them.
Alice decides to put the message inside a lock box, then mail the box to Bob.
She buys a lock box and two identical keys to open it.
But then she realizes she can send the key to open the box to Bob via mail, as the mailman might open
the package and take a copy of the key.
And still, Alice arranges to meet Bob at nearby, but to give him one of the keys.
It's inconvenient, but she only has to do it once.
After meeting Bob, Alice gets home.
He uses her key local message into the lock box.
Then she sends the lock box to Bob.
The mailman could look at the outset or even throw the box away.
So Bob doesn't read the message, but there is no way he can read the message as he has no way of opening
the lock box.
Now, Bob can use his identical key to unlock the lock box and read the message.
This works well.
And now that Alice and Bob have identical keys, Bob can use the same method to security.
Blair meeting at the bar to exchange keys.
It's inconvenient, though.
It gets more inconvenient when Alice and Bob on opposite sides of an ocean.
So far, this asymmetric encryption is used, which we will see in upcoming videos.
In the next lecture, we will see at once symmetric encryption.