Types of Cryptography | Blockchain

In this video we will discuss:
Symmetric Key Cryptography
Asymmetric Key Cryptography
Encryption
Decryption

#blockchain
#cryptography
#symmetric key cryptography
#asymmetric key cryptography

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7:29 left activities on blockchain in this video we’ll talk about types of cryptography so basically that two types the first one is symmetric key cryptography the second one is all symmetric key cryptography now as names such as the first one should be having symmetric key and second one will have

Two different keys right so let’s start the first one so let’s say assume we have a and B now a want to send a message to B what a will do a will simply encrypt the message using a key so let’s say that key is k1 so using a

Key k1 a will encrypt a message that message will go to be the in fact even B cannot read that message because it is encrypted format so B has to decrypt it now which key B will be using of course the same key right we just gave one so a

And B both will have the same key which is k1 that’s a different question how will they share this key with each other of course not a network right at the end we want them to have the same key which is k1 so now let’s say we have

One more we have a and C so of course we have be there so if a want to send a message to see now what above key a should use should a use k1 of course not right because b has k1 so if a want to

Send a message to C or we should not be interpreted by anyone else it will use a different key now and let’s say we will leave that as k2 so between a and B we have k1 between a and C we have k2 let’s say B and C won’t attract what key they

Will use will they use k1 of course not will they use k2 of course not they will need a different key which is k3 whatever says as the number of user increases we have to increase the number of keys and it will be difficult to manage one example in my pocket I have

To carry hundred keys because if I want to interact with hundred people I have to manage all the keys we don’t want that so that’s one of the topic of symmetric let’s move towards our symmetric asymmetry cryptograph they also known as public key cryptography so basically we use two

Different keys here one is private key and one is public key so what is this public key and private key as name suggests everyone will have two keys let’s say I want to send a message to BP send a message to C’s so on this network we have multiple nodes each node will

Have two keys the private key and a public key so a will have its own private can public key B will have his own ramekin public key C will have its own private can public key if you want to encrypt and decrypt the message you

Have to use both the case not one so to encrypt a message you can use public key but to decrypt the message you have to use private key if you are using a private key to encrypt the message then you have to use a public key to decrypt

A message so you have to use both the key the same time you can’t simply say I will Inc it with public can decode public key that’s not possible so we have to use both so if you are encrypting with private you came with public here if you’re encrypting with

Public every ticket with private how do you achieve security here so let’s say if a want to send a message to B as we know the public key of B is known to everyone public right so of course a will also know the public key of B so

What able do a will encrypt the message with B’s public key and then that message goes to B of course everyone else on the network can see that message the encrypted message but no one can decrypt it you know why because that message will be decrypted only with B’s

Private key and who has B’s private key of course only be the private right so you will know your private key and everyone else will know your public key so that’s how we do it so how do I achieve security enter the message with public key and to give the message with

Private key let’s do it again so let’s say C want to send a message to D so which public key si will use so si will use a public key of D so C will encrypt the message with this public key and D will decrypt the message with its

Own private key so that’s how this cryptography works but now the question is what is that key is is it a number is it the text that we’ll discuss in a separate video we talked about exactly turkey so that’s it from this video that we are talked about types of

Cryptography the injunction will be using the public key cryptography we use that so yeah that’s it on this video I hope you enjoyed that in coming section and this is that we are not done yet bye