That's what I mean, if his site was targeted specifically no matter what you have in that hidden field (encrypted or not) he'll keep getting those registration.

For someone who would want to flood his form, he can spend 1 day fetching that form page 1 time/sec and save the "encrypted data" of that form, and in the next day he can do '86400' successful registration according to your method.

if he locks it up to maximum of 1 hour , then it's 3600 successful registration per hour.

if he's specifically targeted the only possible way is using 'recaptcha' and if that doesn't work , I would suggest saving the requesting ips and block them using .htaccess file "Deny from xxx.xxx.xxx.xxx"

In reply to Re^4: enabling "Submit" button after X seconds. by ahmad
in thread enabling "Submit" button after X seconds. by mrc

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.