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Is a session ID unique?
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.
Is session ID safe?
Web applications should never accept a session ID they have never generated, and in case of receiving one, they should generate and offer the user a new valid session ID.
How to create unique session ID for every time user US the application?
Any Help is Appreciated. Please Sign up or sign in to vote. 2. After registering user, before starting the exam, store user’s information in database with an ID then get the ID (How? Scope_Identity) Then you can request for privious questions with ExamineeID. I prefer the second way. I don’t trust to GUID very much 😉
Is the PHP Session ID-Stack Overflow unique?
It’s not very unique as shipped. In the default configuration it’s the result of a hash of various things including the result of gettimeofday (which isn’t terribly unique), but if you’re worried, you should configure it to draw some entropy from /dev/urandom, like so
Can You Trust a unique ID on Facebook?
If uniqueness is the only constraint, then the short answer is yes. If you are Facebook or Google, then due dilligence would require that you take some time to assess how likely collisions are based on the algorithm and the architecture of the application.
What should I look for in a session ID?
From a security viewpoint you need to ensure that the session id is not predictable – i.e. If you really must implement your own session id generation, then use a good random number generator. Have a look at the size of the session ids your current system is generating and aim for at least that size in your implementation.