What is session Resumption caching?
TLS Session Resumption allows caching of TLS session information. There are 2 kinds: stateful and stateless. In stateful session resumption, BIG-IP stores TLS session information locally. Renegotiation uses the same TCP connection to renegotiate security parameters which does not involved Session ID or Session Tickets.
What is SSL session ticket?
A session ticket is a blob of a session key and associated information encrypted by a key which is only known by the server. The ticket is sent by the server at the end of the TLS handshake. Clients supporting session tickets will cache the ticket along with the current session key information.
What is new session ticket in TLS?
TLS creates a session ticket by using the TLS Session Resumption without Server-Side State mechanism. This mechanism helps to improve the performance of TLS. The TLS server uses this mechanism to create a key to encrypt a session ticket.
How do you use session tickets?
Your ticket purchase is linked to your individual Sessions Live account. Login using the email address associated with your account on the Sessions Live app or on SessionsLive.com. Check to make sure your purchased ticket is displayed in the “My Tickets” section.
Is session better than cache?
Session data is stored at the user level but caching data is stored at the application level and shared by all the users. Sessions may not improve performance whereas Cache will improve site performance. Cache wont maintain any state, whereas Sessions will maintain separate state for every user.
What are the limitations of session resumption with session IDs?
Session resumption with session IDs has a major limitation: servers are responsible for remembering negotiated TLS sessions for a given period of time. It poses scalability issues for servers with a large load of concurrent connections per second and for servers that want to cache sessions for a long time.
How does session resumption work in TLS 1.3?
The draft of TLS 1.3 replaces session IDs and session tickets with the concept of session resumption via pre-shared keys (PSK). After the initial handshake, the server sends a PSK identity to the client.
How does Memcached do session resumption in TLS?
When a new session with a session ID is negotiated, a host will encrypt the new session and insert it to memcached, indexed by the session ID. When a host needs to look up a session for session resumption, it will query memcached using the session ID as the key and decrypt the cached session to resume it.
Which is better session resumption or new session?
Moreover, a session resumption does not require any large finite field arithmetic (new sessions do), so the CPU cost for the client is almost negligible compared to that in a full TLS handshake. For mobile users, the performance improvement by session resumption means a much more reactive and battery-life-friendly surfing experience.