Operation Knock Knock


A simple blog/guestbook application that can turn into a secret communication application
 whenever the user performs a set of actions (knock sequence).

Steps for secret communication:
1. Create a new user.
2. Calculate the MD5 of the username and convert it to hexadecimal.
3. The first 4 digits of the above value modulo 4 will serve as the knock sequence.
4. Use the following pages to execute the knock sequence:
	0 : /user/register
	1 : /user/login
	2 : /message/add
	3 : /message/list
5. After successful execution of the knock sequence the users can communicate in secret.