【Java入門】パスワード管理ツールを自作！暗号化＆保存まで完全解説

"I want to safely manage the passwords I use for various services."
"I want to create a tool that is useful for practicing Java."
For those who have such concerns,Building your own password management toolis.

This tool allows you to:Register, search, and encrypt passwordsThrough features such as
JavaFile operations, encryption, class design, and repetitive processingYou can learn in a well-balanced way.

In this article,A secure password management app that anyone can easily implementWe will explain how to create this in an easy-to-understand manner, with code included.

table of contents

What is a password manager?
1. Learn practical security tools with Java
Understand the structure of the tool you want to create
1. Simple design with a minimum of three functions
Creating the Credential Class
1. Data class with registration information (service name, ID, password)
Create the encryption class AESUtil
1. Make your passwords safe with Java's AES method
Main process: PasswordManager class
1. Implemented the function to register and search from command line
Security Considerations
1. Basic precautions for safe handling
Application ideas: GUI and export functions
1. How can we make it a more useful tool?
Completed code summary
Summary: Learn secure management with Java

What is a password manager?

Learn practical security tools with Java

Conclusion: You can easily experience the ability to securely store and manage passwords using Java.

We use a lot of passwords, including for social media, shopping, and work accounts.
It is very dangerous to manage them on paper or in a notebook.

That's where a password management tool comes in handy.
With Java,Your own simple toolBy creating this, you can also learn about file storage and encryption at the same time.

Understand the structure of the tool you want to create

Simple design with a minimum of three functions

Conclusion: You can create a practical management tool with just these three features:

Register password (save service name + ID + PW)
Search for registered information
Save and load to file (with encryption)

Structure image:

Creating the Credential Class

Data class with registration information (service name, ID, password)

Create the encryption class AESUtil

Make your passwords safe with Java's AES method

;

Main process: PasswordManager class

Implemented the function to register and search from command line

1	`;` `(` `); }` `)) {` `; }` `); } } }` `,` `3` `012`

Security Considerations

Basic precautions for safe handling

Don’t embed the encryption key in the app, but use it as an environment variable
Restrict access to the file (if you are using Windows, right-click and select Properties).
Add automatic logout and PIN code for added security