Session resumption (caching)

What is session resumption?

In this case an "abbreviated handshake" can be used, which requires one roundtrip and also allows the client and server to reduce the CPU overhead by reusing the previously negotiated parameters for the secure session. This technique is called TLS Session Resumption.

How does TLS session resumption work?

Generally, the TLS session resumption functionality speeds up client reconnections, as no full TLS handshake needs to occur. Instead, a value known from a previous session is used to verify the authenticity of the connection.

What is session caching in TLS?

The “client side session cache” mechanism allows the server to store an encrypted version of the session information on a client, allowing a server to maintain a much larger number of active sessions in a given memory footprint.

What is SSL session reuse?

An SSL session is started by a handshake procedure that involves multiple round trips (see the following figure). The client and server have to exchange four messages with a latency of around 50 milliseconds each.

How long does TLS session last?

It depends entirely on the configurations at both ends: how often the session should be re-keyed and how long a session should last. No single answer. Several minutes for the key; an hour or more, maybe even 8, for the session. It depends totally on your requirements.

What is the difference between session ticket and session ID in TLS?

With session-ids, the server needs to keep track of previous sessions that could be continued at some point in time. This results in some extra work that the server has to do. The session-ticket, in contrast, is not an identifier but the session data encrypted by the server (and only the server can decrypt it).

What is the difference between TLS session resumption and renegotiation?

Resumption restarts a previous TLS session in a new TCP connection, using the same TLS parameters. Renegotiation continues an existing TLS session in the same TCP connection, but changes some of the parameters.

Does TLS encrypt data at rest?

The rest can use encrypted transport with SSL or TLS. When data is encrypted in transit, it can only be compromised if the session key can be compromised.

How TLS works step by step?

The client contacts the server using a secure URL (HTTPS…). The server sends the client its certificate and public key. The client verifies this with a Trusted Root Certification Authority to ensure the certificate is legitimate. The client and server negotiate the strongest type of encryption that each can support.

What is L1 and L2 caching?

The first-level (L1) cache is small enough to provide a one- or two-cycle access time. The second-level (L2) cache is also built from SRAM but is larger, and therefore slower, than the L1 cache. The processor first looks for the data in the L1 cache. If the L1 cache misses, the processor looks in the L2 cache.

What is the difference between session and caching?

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. Items in cache can expire after given time to cache while items in session will stay till session expires.

Can you reuse a session key?

Using a session key for more than one session may compromise it. Another disadvantage of using a session key to encrypt data is that it is vulnerable to eavesdropping and compromise. As a symmetric key, a session key is used to both encrypt and decrypt data.

What are session starts?

Session Starts (SS)

The total number of sessions with a minimum duration of one minute in length that were started within the reported time period.

What is session in backend?

Session is broad technical term which can be used to refer to a state which is stored either on server side using in-memory cache or on the client side using cookie , local storage or session storage . There is nothing specific on the browser or server that is called session.

What is an IBM session?

A session is a series of requests to a servlet, originating from the same user at the same browser. Sessions allow applications running in a web container to keep track of individual users. For example, a servlet might use sessions to provide "shopping carts" to online shoppers.

How does HTTP session work?

The client establishes a TCP connection (or the appropriate connection if the transport layer is not TCP). The client sends its request, and waits for the answer. The server processes the request, sending back its answer, providing a status code and appropriate data.

Why are sessions important?

Sessions can be analyzed in a way that reveals how users truly interact with an app. For example, session data can determine the average length of time users spend on an app as well as the time of day users are most likely to engage with a particular app.

What is session duration?

Session duration is defined as the time frame during which there are regular active interactions occurring between a user on a website. The session is timed out when there is no activity from the user for a predefined time duration (30 minutes by default).

What is session vs page view?

In web analytics, a session is either capped by exiting the website or by a period of user inactivity. Page Views, as commonly used with Google Analytics, is the count of times the content of a page is loaded or re-loaded.

What is the difference between JWT and session?

One of the simplest ways is to return both a session_token and a JWT when a user starts a session. The session_token is a static value that is good for the lifetime of the session (stored server-side), while the JWT has its own, shorter-lived expiry.

What is session vs cookie?

Cookies are client-side files that are stored on a local computer and contain user information. Sessions are server-side files that store user information. Cookies expire after the user specified lifetime. The session ends when the user closes the browser or logs out of the program.

How are sessions stored?

A session stores the variables and their values within a file in a temporary directory on the server. Cookies are stored on the user's computer as a text file. The session ends when the user logout from the application or closes his web browser.

What is a Db2 session?

A session variable is a named memory variable that you access through SQL statements. Session variables let you share data between SQL statements without the need for application logic to support this data transfer. The Db2 for z/OS® supports the following types of session variables: Built-in session variables.

What is IBM KVM?

KVM virtualization on IBM Z. The KVM hypervisor defines the CPUs, memory, and virtual devices that are available to an instance of Linux on KVM when it is booted. It also specifies the host resources that back these guest resources.

What is IBM Session Manager?

TSO/E Session Manager keeps a complete journal of everything that happens during your terminal session while you are in line mode TSO/E. It records everything you type in and everything the system displays.