If a function decrypt(GHYFtg56) were possible crypt() would be useless for storing passwords as anyone else (including the attacker) could do the decyphering too. You would have won nothing by storing it as "GHYFtg56".

cryptographic hash function must have the property that it is easy to create the hash (i.e use crypt()) but impossible to do the inverse (i.e. decrypt()) in acceptable time.

In other words: Your script needs to know some password to do something. Whatever the script knows, everyone with access to the script can find out too. The only exception is if the script stores the information somewhere else. See my other post here for a possible method

In reply to Re^3: Mention password in the script -encrypted form by jethro
in thread Mention password in the script -encrypted form by perl177

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.