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I am going to uniquely identify a user by storing a unique ID in his/her cookie. HttpSession ID is a good choice from my google search. Just wanted to know how unique it is ? Is it unique to the webcontainer or once it expires , will it get regenerated ? If it repeats, all my user login can go for a toss.Need some expert opinion on using sessonID as a unique identifier for my users.
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A session ID is a unique number that a Web site's server assigns a specific user for the duration of that user's visit (session). The session ID can be stored as a cookie, form field, or URL (Uniform Resource Locator). Some Web servers generate session IDs by simply incrementing static numbers.
The session ID is generated using the Random Number Generator (RNG) cryptographic provider. The service provider returns a sequence of 15 randomly generated numbers (15 bytes x 8 bit = 120 bits). The array of random numbers is then mapped to valid URL characters and returned as a string.
Session IDs are sensitive information that may allow an attacker to steal, modify and/or destroy information once they obtain one. Information sent via URL parameters is: Stored in clear text in the browser history. Sent to external sites via the referrer HTTP header.
The session ID can be defined by a command line option or a resource. The session ID can be a single value; for example “Smith". A set of session Ids can be defined; for example, Smith+n where n is 3 would make 3 session Ids available, “Smith1", “Smith2", and “Smith3".
Session IDs are unique and meaningful only for the lifetime of a session. A session ID identifies a session: nothing more, nothing less. It does not identify a user.
You cannot and should not rely on session IDs ever being reused, let alone for the same user.
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A session ID must uniquely identify a session on a server, or on a cluster of servers. You don't have any guarantee of uniqueness across restarts. Why don't you simply use a database sequence, or a UUID?
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