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18.03.2015
This document describes the basic concepts of Secure Sockets Layer (SSL) protocol and provides a sample transaction and packet capture. Closure Alerts: The connection between the client and the server must be properly closed in order to avoid any kind of truncation attacks. When an SSL client and server begin to communitcate, they agree on a protocol version, select cryptographic algorithms, optionally authenticate each other, and use public key encryption techniques in order to generate shared secrets. Protocol Version: The version of the SSL protocol by which the client wishes to communicate during this session. Certificate Request: The server sends the client a list of all the certificates that are configured on it, and allows the client to select which certificate it wants to use for authentication. The Server Hello Done message is sent by the server in order to indicate the end of the server hello and associated messages. The content of this message depends on the public key algorithm selected between the Client Hello and the Server Hello messages.
The Change Cipher Spec message is sent by the client, and the client copies the pending Cipher Spec (the new one) into the current Cipher Spec (the one that was previously used).
A Finished message is always sent immediately after a Change Cipher Spec message in order to verify that the key exchange and authentication processes were successful. Find cisco decrypt type 5 password, configuring cisco asa devices for use with npm, cisco asa. The enable password command uses the weaker type 7 encryption, whereas the enable secret command uses the stronger type 5 encryption.
However, a handshake record that contains a Finished message is always encrypted, as it always occurs after a Change Cipher Spec (CCS) record.
A close_notify message is sent that indicates to the recipient that the sender will not send anymore messages on that connection.


These messages are carried by the record layer and are fragmented, compressed, and encrypted, based on the current connection state. In the first Client Hello of the exchange, the session ID is empty (refer to the packet capture screen shot after the note below). It contains the combinations of cryptographic algorithms supported by the client in order of the client's preference (first choice first).
If the session ID sent by the client in the Client Hello is not empty, the server looks in the session cache for a match. This is only to remind the client that it should start the renegotiation with a Client Hello request when convenient. The renegotiation must begin in no more than one or two times the transmission time of a maximum-length application data message.
If the Diffie?Hellman (DH) parameters are included with the server certificate, this message is not used.
The client uses either a premaster key encrypted by the Rivest-Shamir-Addleman (RSA) algorithm or DH for key agreement and authentication.
Microsoft products (Microsoft Internet Explorer and Internet Information Services) are known to exceed these limits. CCS records might or might not be encrypted; in a simple connection with a single handshake, the CCS record is not encrypted.
Alerts might or might not be encrypted, and might occur during a handshake or during data transfer.
In summary, the client sends a Client Hello message to the server, which must respond with a Server Hello message or a fatal error occurs and the connection fails.
If a match is found and the server is willing to establish the new connection using the specified session state, the server responds with the same value that was supplied by the client.


The client ignores the Hello request from the server if the handshake process is already underway. Upon receipt of the Server Hello Done message, the client verifies that the server provided a valid certificate, if required, and checks that the Server Hello parameters are acceptable.
When RSA is used for server authentication and key exchange, a 48-byte pre_master_secret is generated by the client, encrypted under the server public key, and sent to the server.
The server selects a cipher suite or, if no acceptable choices are presented, returns a handshake failure alert and closes the connection. This indicates a resumed session and dictates that the parties must proceed directly to the finished messages. This alert is only a warning; however, the server might respond with a fatal handshake failure alert if client authentication is required.
The client sends a Change Cipher Spec message following handshake key exchange and Certificate Verify messages (if any), and the server sends one after it successfully processes the key exchange message it received from the client. When a previous session is resumed, the Change Cipher Spec message is sent after the Hello messages. The server might return an empty session_id in order to indicate that the session will not be cached, and therefore cannot be resumed.
In the captures, the Client Exchange, Change Cipher, and Finished messages are sent as a single message from the client.




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