SecurityImages 5.X is only running with Joomla! 1.5 and the redesign of API has introduced some incompatibilities.
Developers/Hackers/Individuals who want to use the latest version of SecurityImages may want to read the
following. Basic PHP knowledge  is recommended.

Architecture

SecurityImages 4.0.X

• Only work with Joomla! 1.0.X
• Provide 2 files that 3rd party code must include:
• client.php in order to quickly create a captcha and the input box
• server.php in order to validate user entries and check correctness
• Everything is packed in one component.
• Patches for common 3rd party tool are included in code so it ca be referenced by external extensions :
  akobook, akocomment, joomla to name a few.
• You have to overwrite Joomla! files to add protection of form for login, register, lost password, contact

SecurityImages 5.0.X

• Only work with Joomla! 1.5.X
• Use the event handling mechanism of Joomla! 1.5 to  create captcha and check correctness
• You'll have to install a system content plugin and a component,
• it do not contains any patches anymore
• You have to overwrite Joomla! files to add protection of form for login, register, lost password, contact

Main differences in securityImages 5.X

1. There is no client.php and server.php file anymore
2. API are a lot simpler, and dependency are reduced (no PHP code to include) as it use events.
3. More object oriented
4. Image creation is done inside the Joomla! framework while in 4.0.X it was done without any Joomla!
   framework support.

if (file_exist($mosConfig_absolute_path.'/administrator/components/com_securityimages/client.php')) {

<?php include ($mosConfig_absolute_path.'/administrator/components/com_securityimages/client.php'); ?>

}

$packageName = 'securityChooseUniqueKeyName';

2. At the position where You want the Captcha image to be inserted 

<?php echo insertSecurityImage($packageName); ?>

<?php echo getSecurityImageText($packageName); ?>

 //will be replace at runtime, depending on user locale 

//with "Please Enter what You see:" 

<?php echo getSecurityImageTextHeader(); ?> 

//will be replace at run time, depending on user locale with 

//"If You do not see ...Hit reload" 

<?php echo getSecurityImageTextHelp(); ?>  

//will be replace at run time with the input box

<?php echo getSecurityImageField($packageName); ?>  

if (file_exist($mosConfig_absolute_path.'/administrator/components/com_securityimages/server.php')) {

include ($mosConfig_absolute_path.'/administrator/components/com_securityimages/server.php');

}

$packageName = 'securityChooseUniqueKeyName';

$security_refid  = mosGetParam( $_POST, $packageName.'_refid', '' );

$security_try      = mosGetParam( $_POST, $packageName.'_try', '' );

$security_reload = mosGetParam( $_POST, $packageName.'_reload', '' );

$checkSecurity = checkSecurityImage($security_refid, $security_try);

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