Password Strength Checker

---

Introduction

This document describes a File Encryption and Decryption Utility implemented in Python. This utility enables users to securely encrypt and decrypt files using a password-derived key. The utility leverages the cryptography library, which provides a robust framework for implementing AES (Advanced Encryption Standard) encryption.

See Password_Srength_Checker

---

Purpose

The utility allows users to:

• Encrypt sensitive files to prevent unauthorized access.
• Decrypt files that were previously encrypted with the same password, restoring them to their original state.

This utility is useful for securing sensitive data in environments where file access may not be fully controlled.

---

Requirements

To run this script, you need:

Python 3.x cryptography library: You can install it using:

pip install cryptography

---

Script Structure

The Python script is structured as follows:

1. Key Generation: generate_key function derives a 256-bit encryption key from a password using PBKDF2 (Password-Based Key Derivation Function 2) with SHA-256 hashing.
2. File Encryption: encrypt_file function encrypts the contents of a file using the generated key.
3. File Decryption: decrypt_file function decrypts an encrypted file using the same key.
4. Main Function: main function prompts the user for inputs and orchestrates the encryption/decryption process.

---

Code Explanation

Key Generation Function

Function: generate_key

The generate_key function generates a 256-bit encryption key from a user-provided password using PBKDF2, a password-based key derivation function. This function ensures that the password is securely transformed into a key suitable for AES encryption.