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A session ID is typically granted to a visitor on their first visit to a site. It is different from a user ID in that sessions are typically short-lived (they expire after a preset time of inactivity which may be minutes or hours) and may become invalid after a certain goal has been met (for example,
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such as HTTP. For example, a buyer who visits a seller's website wants to collect a number of articles in a virtual shopping cart and then finalize the shopping by going to the site's checkout page. This typically involves an ongoing communication where several webpages are requested by the client
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is a simple and effective measure as long as the attacker cannot connect to the server from the same address, but can conversely cause problems for a client if the client has multiple routes to the server (e.g. redundant internet connections) and the client's IP address undergoes
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and sent back to them by the server. In such a situation, it is vital to keep track of the current state of the shopper's cart, and a session ID is one way to achieve that goal.
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and obtain potential privileges. A session ID is usually a randomly generated string to decrease the probability of obtaining a valid one by means of a
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As session IDs are often used to identify a user that has logged into a website, they can be used by an attacker to
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Examples of the names that some programming languages use when naming their cookie include JSESSIONID (
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once the buyer has finalized their order, they cannot use the same session ID to add more items).
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is a piece of data that is used in network communications (often over
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