it is a type of testing in which one will check the 
security of the application by conducting the following 
types of testing
1. Autentication testing: it is a type of testing in which 
one will enter different sets of user names and password 
and check wether the application is allowing only the 
authorised persons or not

2. Direct URL Testing: it is a type of security testing in 
which one will enter the direct URL's (uniform resource 
locator) of secured pages and will try to access that. if 
at all the application is not allowing them to access then 
we will considor it has a secured application otherwise, 
not a secured application.