In this rapidly growing era of technology, it is important to provide security to our doors. In this prototype, there will be password encryption. On pressing the correct password, the door opens and if the password entered is incorrect then the door remains closed.
Hardware requirements:
Arduino UNO:

The Arduino is a programmable microcontroller, it's an open-source electronics proto-type platform. It interacts with the user by receiving input with the aid of sensors and provides the output employing LED, buzzer, etc.,
In order to know more about the Arduino UNO, refer to this article.
Jumper wires:

Jumper wires are used to establish connections between different components in the circuit.
4X4 Keypad:

A 4x4 matrix keypad is used as an input device that takes inputs from the users. It consists of 16 pins in total with four rows and four columns. On pressing a key, a connection will be established between the corresponding row and column between which the switch is placed.
Check this project of 4*4 Keypad as well - Link.
16*2 LCD:

LCD- Liquid Crystal Display is an electronic module that uses liquid crystal to produce a visible image. It is the basic module that is generally used in DIY and circuits. The display segments are affordable and simply programmable.
Breadboard:

A breadboard is a flat piece of wood that is provided with holes that allow users to build a circuit including the components and connections without the need for soldering due to which it is reusable and finds its best usage for the students who are new to build circuits. The holes in any horizontal line will be in series whereas the vertical holes remain at an equipotential state. There are different sizes of breadboards available in the market which include "full size", "half - size" and, "mini size" breadboards.