Secret Diary application is an application that is used to write a personal diary about daily life, with the contents of diaries in encrypted forms stored in the database. Users can read it if they have entered the password correctly. If the user enters the password incorrectly, the diary displays random sentences.

Business process :
- The user must first register to save the password as a session key to encrypt the contents of the diary.
- The application has 3 default Diary categories, namely: Love, Family, and School. Users can add new categories to the Category menu.
- Users create a new diary by selecting a category on the Diary List page.
- The Diary List page can be opened if the user has entered a password.
- The Diary List page displays categories and table of contents. Diary that has been made.
- Users can view the contents of the Diary by selecting one of the Diary titles on the Diary List page
- If the password entered is correct, then the contents of the Diary display a readable description, whereas if the password is incorrect then the contents of the Diary display random letter descriptions
- UI design can be seen on the Screenshots page