What is cipher certificate?
Cipher suites are sets of instructions on how to secure a network through SSL (Secure Sockets Layer) or TLS (Transport Layer Security). As such, cipher suites provide essential information on how to communicate secure data when using HTTPS, FTPS, SMTP and other network protocols.
How does server select cipher suite?
During the handshake phase of establishing an TLS/SSL connection, the client sends supported cipher suites to the server. The server chooses the cipher to use based on the preference order and what the client supports.
How does the cipher suite work for authentication?
The exact method used for authentication is determined by the cipher suite negotiated. The client and server exchange random numbers and a special number called the Pre-Master Secret. These numbers are combined with additional data permitting client and server to create their shared secret, called the Master Secret.
What happens when the server requests a certificate?
The server sends its certificate to the client for authentication and may request a certificate from the client. The server sends the “Server hello done” message. If the server has requested a certificate from the client, the client sends it.
How does the server prove its identity in TLS?
The client and server make contact and choose the cipher suite that will be used throughout their message exchange. In TLS, a server proves its identity to the client. The client might also need to prove its identity to the server. PKI, the use of public/private key pairs, is the basis of this authentication.
How does the server receive the pre-master secret?
The server receives the Pre-Master Secret. The server and client each generate the Master Secret and session keys based on the Pre-Master Secret. The client sends “Change cipher spec” notification to server to indicate that the client will start using the new session keys for hashing and encrypting messages.