By default, sessions are made by 4 infos: • The user's unique Session ID (this is a statistically random string with very strong entropy, hashed with MD5 for portability, and regenerated (by default) every five minutes) • The user's IP Address • The user's User Agent data (the first 120 characters of the browser data string) • The 'last activity' time stamp. Plus your own session datas, of course. 3 of this four datas don't need to be secure, while the first should be quite reliable, even though using MD5, I didn't dive into the code to actually see if it is so (and I'm no security expert). The security level of the latter infos depends on what kind of information you're storing there, and how well you treat them before storing.

You can also decide to store sessions using the database instead, which will be a safer option (provided you don't screw up allowing sql injections!). Note also that: If you have the encryption option enabled, the serialized array will be encrypted before being stored in the cookie, making the data highly secure and impervious to being read or altered by someone.

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More info regarding encryption can be found, although the Session class will take care of initializing and encrypting the data automatically. So well, they should be quite secure; if you don't trust them enough, you're free to hash or encrypt your data how much you want, or still make use of PHP native Sessions without problems.

Jun 26, 2011 - I'm just worried about the security of the framework. Is there an issue or event that a website is being hacked that uses CodeIgniter framework?