[HELP] Making a circuit of a padlock with 4-bit password

Hello
Really need an urgent help.

So I'm doing this problem for memory, counter, and register subjects.

The problem is you have to make a simulation in Multisim or just make a circuit of a padlock with these conditions:

1. You have to create a 4-bit password
2. Register it in the memory
3. If you enter the incorrect passwords for 5 times, the alarm will be turned on. An on the other way, if you enter the correct passwords another indicator will be turned on.

So, what I've gotten logically from this problem is that:

1. Make a circuit to register 4-bit password into the memory
2. Make a 4-bit circuit to guess the password
3. Make a 3-bit counter up to 5 for the maximum guessing part.
4. Make the indicator for the incorrect password after trying for 5 times and the indicator for the correct passwords.

Am i right?

Now the trivial part.
I'm totally blind of how putting all of these together into a circuit.
Like what do I have to use?
Please help
I'm also doing a research after posting this thread, but please do help :'(

Thankyou!