This is the complete project of Digital Logic Design using Logisim. This project combine of two parts. One is combinational and another one is sequential part. There are three projects.All of them have different functionalities. This projects helps to match password.There are several modes of this project. User will save password in one mood and in another mood it will check password whether it mathces with the password provided earlier. If it match then it will unlock otherwise it will remain Lock. One project will take 4 digit password and another project will take 5 digit password and last project is only the sequential part or this project.