In Ssl Tls Does Client Generate The Session Key

Posted : admin On 19.04.2020

Handshake Process

The handshake between the client and server in SSL/TLSoperates as follows:

  1. Clientsends a clientHello message to the server and the client’s random value andsupported cipher suites
  2. Theserver sends a serverhello message to the client and the server’s random value
  3. Theserver sends its certificate to the client for authentication and may request acertificate from the client.
  4. Theserver sends serverHelloDone message
  5. Ifthe server requested a certificate from the client, then the client sends it
  6. Theclient creates a random Pre-Master Secret and encrypts it with the public keyfrom the server’s certificate
  7. Theclient sends the encrypted Pre-Master Secret to the Server
  8. Theserver and the client each generate the Master Secret and session keys based onthe Pre-Master Secret
  9. Theclient sends the ChangeCipherSpec notification to the server to begin using thesession keys for hashing and encrypting data.
  10. Theclient sends the clientFinished message.
  11. Theserver gets the ChangeCipherSpec and switches to symmetric encryption using thesession key.
  12. Theserver sends serverFinished message.
  13. Theclient and server can now exchange application data using the symmetricencryption and session key.

TLS/SSLalso has a process for resuming a session:

  1. Theclient sends a clientHello message using the Session ID of the session to beresumed
  2. Theserver checks its cache for the Session ID, if it finds it, then the session isresumed by sending a serverHello Message to the client with the Session ID.Otherwise a completely new handshake is performed
  3. Ifthe Session ID was found, then the handshake resumes at step 9.

<http://msdn.microsoft.com/en-us/library/windows/desktop/aa380513%28v=vs.85%29.aspx>

<http://technet.microsoft.com/en-us/library/cc785811%28v=ws.10%29>

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In Ssl Tls Does Client Generate The Session Keys

In SSL protocol handshake both sides generate the same encryption key which is then used for the session. It is done following this procedure, in general: Client & server generate each a random value and send to each other. Server sends the public key to the client. SSL/TLS Overview. Search this site. A session key is generated as part of the handshake that initially takes place between the client and server. The session key is used for hashing. Once the session key is created and the handshake is complete, both sides can use the session key to encrypt messages before. Oct 10, 2018 The purpose of this message is to generate that common key between that client and the server without exposing to an outsider. There are two client key exchange methods described in the TLS v1.2 spec. How Does SSL/TLS Work? What Is An SSL/TLS Handshake? SSL/TLS are protocols used for encrypting information between two points. It is usually between server and client, but there are times when server to server and client to client encryption are needed. This article will focus only on the negotiation between server and client.

In Ssl Tls Does Client Generate The Session Key In Spanish

Session Keys

A session key is generated as part of the handshake thatinitially takes place between the client and server. The session key is usedfor hashing. Once the session key is created and the handshake is complete,both sides can use the session key to encrypt messages before transmission.This is preferable to continuing to use public private key as symmetric keyencryption is faster. The session key is designed to have a lifespan limited tothe session it is associated with. It is strong enough to stand up tocryptanalysis for that time.

<http://msdn.microsoft.com/en-us/library/windows/desktop/aa380513%28v=vs.85%29.aspx>

<http://technet.microsoft.com/en-us/library/cc781476%28v=ws.10%29.aspx>