Password Vault (COMMAND LINE INTERFACE) Using JAVA

A simple yet secure Password Manager built using Java, AES Encryption, and File Storage. It allows users to add, view, edit, and delete passwords securely from a command-line interface.

Features

AES Encryption (javax.crypto) for all stored passwords

Master Password Authentication before accessing the vault

Secure File Storage: encrypted passwords saved in vault.txt

CRUD Operations:

Add new password

View all stored passwords

Edit existing passwords

Delete passwords

Modular Code Structure (separate utility and service classes)

Extensible for Android app or GUI integration

Project Structure

src/ ├── CryptoUtil.java # Handles AES encryption and decryption ├── PasswordVault.java # Core vault operations (add, view, edit, delete) └── Main.java # Main user interface and control flow vault.txt # Auto-generated encrypted vault file

Technologies Used

Java 8+

AES Encryption (128-bit)

File I/O (FileReader, FileWriter, BufferedReader)

Basic Exception Handling

How to Run

Clone this repo:

git clone https://github.com/yourusername/password-vault.git cd password-vault

Compile Java files:

javac src/*.java

Run the application:

java -cp src Main

Enter the Master Password (default is MySecretKey12345).

Example Flow

Enter Master Password: MySecretKey12345

1. Add Password
2. View Passwords
3. Edit Password
4. Delete Password
5. Exit Enter your choice: 1

Enter site name: Gmail Enter password: gmail@123

Password saved successfully!

Enter your choice: 1 Enter site name: Instagram Enter password: instaPass!2024

Password saved successfully!

View Stored Passwords

rust Copy Edit Enter your choice: 2 Gmail -> myGmail@123 Instagram -> instaPass!2024

Edit a Password

Enter your choice: 3 Enter site name to edit: Gmail Enter new password: newGmailPass@321 Password updated successfully.

View Again After Edit

Enter your choice: 2 Gmail -> newGmailPass@321 Instagram -> instaPass!2024

Delete a Password

Enter your choice: 4 Enter site name to delete: Instagram Password deleted successfully.

View After Deletion

Enter your choice: 2 Gmail -> newGmailPass@321

Enter your choice: 5 Exiting Password Vault. Goodbye!

vault.txt File after all operations

If you open the file manually, it contains something like:

Gmail:EncryptedDataHere (Encrypted password, safe even if someone opens the file!)