Which authentication plugin is best?

[eluser]jedd[/eluser]
[quote author="rana" date="1260806080"]
I am new to codeigniter. Interested to use an authentication plugin. Please suggest me which one is best?
[/quote]

Best for what purpose?

You should consider your requirements - perhaps even tell us what they are, so we can suggest something with a bit more accuracy - and evaluate your requirements against the features of the different auth libraries.

From what I've seen so far, you're generally better off - assuming a non-trivial application is being developed - to develop your own system from scratch. It's rare to find one that you can fully understand and modify in less time. Of course, for very small applications this rule of thumb doesn't apply.