i mean i want to know where i can learn all types of security issues and how to prevent them ??...like sql injection,xss etc. thank you in advance...:)....
If you are using the php/mysql code that Dreamweaver uses, you are good to go with Dreamweaver as it santizes the input and helps prevent SQL injection. **NOTE** This is true for Dreamweaver 8.02 and above. Older version of Dreamweaver did not prevent sql injection well. However, if you modify the dreamweaver code, then you have to make sure you are properly sanitizing the input. The code at the top of each page in regards to magic quotes is the santizer.
In regards to XSS, you have to sanitize the output. I usually do this: <?php echo htmlentities($row_Recordset1['column_name],ENT_QUOTES);?> Please see http://php.net/manual/en/function.htmlentities.php so that you get a better understanding of this PHP function.
Some other things you can do is if running on apache look into mod_security to help with sql injection attacks. You can also look at htmlpurifier http://htmlpurifier.org/ to further help with XSS attacks.
im under the impression that,
you can buy an ssl security certificate and apply it to your site, or a directory or specific page on your site and it will automatically protect your page plus let the user know, through the url, that he is browsing an ssl secured certified page
i recommend you look for more info on SSL my 2 cents