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What is change cipher spec in TLS?
Change Cipher Spec is a separate sub-protocol in TLS which is used to indicate either party in TLS negotiation that the subsequent messages will be sent encrypted using the negotiated key and algorithm.
How is a TLS session established?
Establishing a Secure Session by Using TLS The server responds by sending a “Server hello” message to the client, along with the server’s random value. 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.
What happens when server sends ” change cipher spec ” message?
Server receives “Change cipher spec” and switches its record layer security state to symmetric encryption using the session keys. Server sends “Server finished” message to the client. Client and server can now exchange application data over the secured channel they have established.
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 is the current version of TLS handled?
The current TLS standard is not very clear on how versions should be handled. Annex E.1 contains some information, from which we can see that the implicit idea is that the selected version depends on what the client and server support, not on what the client and server may elect to use on a whim.
How is the master secret used in a TLS connection?
The master secret key, which is 48 bytes in length, will then be used by both client and server to symmetrically encrypt the data for the rest of the communication. The client and the server create a set of 3 keys: Both Client and Server will use the master secret to generate the sessions keys which will be to encrypt/decrypt data.