New session ticket, change cipher spec

1. What does change cipher spec mean?
2. What happens after the client sends a change cipher spec message?
3. Why is there a separate change cipher spec protocol rather than including a change cipher spec message in the handshake protocol?
4. What are the content carried inside the change cipher spec message?
5. What ciphers should I disable?
6. What is cipher specification?
7. Who send the change cipher spec message the client the server or both?
8. What is the function of the ChangeCipherSpec protocol in SSL?
9. How do I update ciphers in Windows?
10. What is change cipher spec in TLS?
11. What is the difference between TCP handshake and SSL handshake?
12. What does change cipher spec represent in SSL protocol stack?
13. What is change cipher spec protocol how it is used by the client and server while setting up a secure connection?
14. How do I turn off cipher in Firefox?
15. What is SSL cipher spec?
16. What SSL ciphers should I use?

What does change cipher spec mean?

Change Cipher Spec

This message notifies the server that all the future messages will be encrypted using the algorithm and keys that were just negotiated.

What happens after the client sends a change cipher spec message?

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. Client also sends "Client finished" message.

Why is there a separate change cipher spec protocol rather than including a change cipher spec message in the handshake protocol?

It could be in the handshake, but separating the two makes it easier to enforce the desired behavior in the protocol.

What are the content carried inside the change cipher spec message?

The message is an indication to the other side. The contents of the Change Cipher Spec mes- sage are simply the value 1 as a single byte. Actually, it is the value “1” encrypted under the current scheme, which uses no encryption for the handshake so that we can see it.

What ciphers should I disable?

If you must still support TLS 1.0, disable TLS 1.0 compression to avoid CRIME attacks. You should also disable weak ciphers such as DES and RC4. DES can be broken in a few hours and RC4 has been found to be weaker than previously thought. In the past, RC4 was advised as a way to mitigate BEAST attacks.

What is cipher specification?

When an SSL connection is established, the client (web browser) and the web server negotiate the cipher to use for the connection. The web server has an ordered list of ciphers, and the first cipher in the list that is supported by the client is selected.

Who send the change cipher spec message the client the server or both?

The change cipher spec message is sent by both the client and server to notify the receiving party that subsequent records will be protected under the just-negotiated CipherSpec and keys. It exists to update the cipher suite to be used in the connection.

What is the function of the ChangeCipherSpec protocol in SSL?

ChangeCipherSpec messages are used in SSL to indicate, that the communication is shifted from unencrypted to encrypted. This message informs that, the data following will be encrypted with the shared secret.

How do I update ciphers in Windows?

Right-click SSL Cipher Suites box and select Select all from the pop-up menu. Right-click the selected text, and select copy from the pop-up menu. Paste the text into a text editor such as notepad.exe and update with the new cipher suite order list.

What is change cipher spec in TLS?

The “Change Cipher Spec” message lets the other party know that it has generated the session key and is going to switch to encrypted communication. The “Finished” message is then sent to indicate that the handshake is complete on the client side.

What is the difference between TCP handshake and SSL handshake?

A precursor to SSL/TLS handshake is the TCP handshake. An SSL/TLS handshake takes place only after a TCP connection has been opened. SSL handshakes are nothing but a series of datagrams being exchanged and certain protocols agreed on to ensure the rest of the communication is secure.

What does change cipher spec represent in SSL protocol stack?

ChangeCipherSpec messages are used in SSL to indicate, that the communication is shifted from unencrypted to encrypted. This message informs that, the data following will be encrypted with the shared secret.

What is change cipher spec protocol how it is used by the client and server while setting up a secure connection?

The Change Cipher Spec protocol is used to change the encryption. Any data sent by the client from now on will be encrypted using the symmetric shared key. This is what Change Cipher Spec looks like in a Wireshark capture.

How do I turn off cipher in Firefox?

You can disable/enable those ciphers in about:config: security. ssl3. rsa_aes_128_gcm_sha256 for TLS_RSA_WITH_AES_128_GCM_SHA256 and security. ssl3.

What is SSL cipher spec?

A CipherSpec identifies a combination of encryption algorithm and Message Authentication Code (MAC) algorithm. Both ends of a TLS, or SSL, connection must agree on the same CipherSpec to be able to communicate. Important: When dealing with IBM® WebSphere® MQ channels, you use a CipherSpec.

What SSL ciphers should I use?

AES based ciphers are more secure than the corresponding 3DES, DES, and RC4 based ciphers. AES-GCM ciphers are more secure than AES-CBC ciphers.