Hi,

I've been using Auth in a website under development and it seems to be
working fine.   The only potential concern I have is that it uses the
'salt' for generating the encrypted password, and obviously to check
it against provided password during login.

My question is :
- Isn't md5 an irreversible ( technically)  algorithm ?
- Is it really necessary to use the salt as part of the key that's
used for encryption using md5 ?  Would that make it harder to crack
the password ?
- Is it a good practice to change the salt once in a while, or is it
supposed to stay the same ? What happens if the salt in the website
changes, would no user be able to login again ?

As you might have guess cryptography isn't really my thing, and hence
appreciate if anyone could shed some light on these.

Cheers,

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