Translations:Installation security hints/64/en
From LimeSurvey Manual
SSL usage
In general we recommend the usage of SSL for sensitive survey data. You usually enable SSL by configuring your webserver correctly and using a SSQL certificate. If you have enabled SSL you should enforce SSL at all time in the global settings of LimeSurvey. Additionally you should set only to used 'secure' cookies by using the related option in config.php.