**1.What Encryption is used in Blockchain ?**

Asymmetric Encryption.

**2. What is Asymmetric Encryption ?**

It’s an encryption technique which uses public key and private key to encrypt /decrypt data. It’s also called Public Key cryptography.

**3. How does Asymmetric Encryption works ?**

Assume there are two participants A and B , where A wants to share a message to B . To encrypt and share the message over the network the following happens.

a) Both A and B creates their own public key and private key .

b) Generated public key is shared between two parties , i.e A knows B Public key and B knows A Public key.

c) When A wants to encrypt the message , then A encrypts the message with B Public key(message + B Public key) , which can be only decrypted by B with it’s private key.

**4) How is Asymmetric Encryption / Public key cryptography used in Blockchain ?**

Whenever a transaction is recorded between two parties A and B ,then following rule applies

Encrypted message = F(M, Privatekey (A)) will always be equal to F( Encrypted message, publickey(A)).

**5) How are Public / Private Key generated ?**

It’s generated via RSA Algorithm , In specific ECDSA algorithm is used to generate random prime numbers that influences decision making of RSA.