how to implement the function: Security Key for registration in a web site?

[nickDeeSH]

I am building a web site, I allow user can register to my web site. Now I have a problem, I don't know how to do a security key? Hope urs help!!! Thanks.

[LiL|aaron]

Look on the net for something like a captcha code, i google searched
'php captcha' and loads came up.

Aaron

[bokeh]

SSL (Secure Socket Layer).

[nickDeeSH]

thanks for yours help