What are different types of keys in SSL ?

1. PRIVATE KEY

• contains the identity information of the server, along with a key value
• must be safe and password protected, as it is used in handshaking. 

2. PUBLIC KEY (Public certificates)

• tightly associated to the private key
• created from the private key using CSR (Certificate Signing Request)
• After creating a private key, you create a CSR, which is sent to your Certificate Authority (CA)
• The CA returns a signed certificate, which has information about the server identity and about CA.

3. ROOT CERTIFICATES

• CA Certificate which is simply a Self-signed Certificate
• represents an entity which issues certificate (Certificate Authority or CA)