Posted by Marcin Dobrucki on 09/26/92 11:24

Greger wrote:

> Im quite comfortable with php but new to encryption, could someone please
> highlight when encryption would be a good thing.

When you have a secret to protect?

> Also:is there a reverse of the md5 function? ( in other words in what way is
> md5 ( + the others sha...)used?

Ehh... no. MD5 is a one-way hash (http://en.wikipedia.org/wiki/MD5).
You really ought to have a look at some literature, maybe start here:
http://www.sans.org/rr/

/Marcin

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