Let us continue with the section of cryptography in this section we will discuss about asymmetric encryption.
Public key cryptography is the most revolutionary concept in last 400 years in public key cryptography
that is asymmetric encryption to reader keys.
Public and private keys are used publicly and be freely distributed.
While it's very private, key remains a secret.
The public key is used for encryption and for decryption.
Private key is used.
The main difference between these methods is the fact that those symmetric systems used to kill rather
than one employed by the Semitic schemes.
One of the keys can be publicly shared, while the other must be kept in private.
Let us come back to the example of Alice and Bob.
This time, Alice and Bob don't ever need to meet.
First, Bob buys a padlock and a matching key.
Then Bob Mills unlock padlock to Alice and keeping the key safe Alice by the simple lock box that closes
with the padlock and puts a message in it.
Then she locks it with Bob Spurlock and mails it to Bob.
She knows that the mailman can't read the message as he has no way of opening the padlock when Bob receives
the lock box, he can open it with his key and read the message.
This only works to send messages in one direction, but Alice could buy a blue lock and the key and
mail the ballot to Bob so that he can reply.
Or instead of sending a message in padlock secure lock box, Alice could just send Bob one pair of identical
keys.
Then Alice and Bob can send messages back and forth in the Semitic lockbox, as they did in the first
example.
Now, I will summarize this real life example.
Bob generates a keeper consisting of public and private key.
Bob then publishes this public and Alice it Alice and generates a temporary Semitic.
And uses Bob's publicly, who securely send it to Bob, Bob then uses his private key to unlock his
copy of Tricky.
Bob and Alice can use dosimetry keys to securely send messages back and forth in the next lecture.
We will see advanced types of asymmetric encryption.