Top 10 ethical hacking projects

				import sqlite3
import hashlib
import os

def hash_password(password):
    salt = os.urandom(32)
    key = hashlib.pbkdf2_hmac('sha256', password.encode('utf-8'), salt, 100000)
    return salt + key

def verify_password(username, password):
    connection = sqlite3.connect('users.db')
    cursor = connection.cursor()
    cursor.execute('SELECT salt, key FROM users WHERE username = ?', (username,))
    user = cursor.fetchone()
    connection.close()
    
    if user:
        salt = user[0]
        key = user[1]
        hashed_password = hashlib.pbkdf2_hmac('sha256', password.encode('utf-8'), salt, 100000)
        return hashed_password == key
    else:
        return False

def register(username, password):
    try:
        connection = sqlite3.connect('users.db')
        cursor = connection.cursor()
        hashed_password = hash_password(password)
        cursor.execute('INSERT INTO users (username, salt, key) VALUES (?, ?, ?)', (username, hashed_password[:32], hashed_password[32:]))
        connection.commit()
        print(f"User {username} registered successfully!")
    except sqlite3.IntegrityError:
        print(f"User {username} already exists!")
    finally:
        connection.close()

def login(username, password):
    connection = sqlite3.connect('users.db')
    cursor = connection.cursor()
    cursor.execute('SELECT * FROM users WHERE username = ?', (username,))
    user = cursor.fetchone()
    connection.close()
    
    if user:
        if user[2] >= 3:
            print("Account locked. Too many failed login attempts.")
        else:
            salt = user[1]
            key = user[2]
            hashed_password = hashlib.pbkdf2_hmac('sha256', password.encode('utf-8'), salt, 100000)
            if hashed_password == key:
                print(f"Welcome back, {username}!")
            else:
                print("Invalid username or password.")
                connection = sqlite3.connect('users.db')
                cursor = connection.cursor()
                cursor.execute('UPDATE users SET attempts = attempts + 1 WHERE username = ?', (username,))
                connection.commit()
                connection.close()
    else:
        print("Invalid username or password.")

def change_password(username, old_password, new_password):
    if verify_password(username, old_password):
        connection = sqlite3.connect('users.db')
        cursor = connection.cursor()
        hashed_password = hash_password(new_password)
        cursor.execute('UPDATE users SET salt = ?, key = ? WHERE username = ?', (hashed_password[:32], hashed_password[32:], username))
        connection.commit()
        connection.close()
        print(f"Password changed successfully for {username}!")
    else:
        print("Invalid username or password.")

def reset_password(username, new_password):
    connection = sqlite3.connect('users.db')
    cursor = connection.cursor()
    hashed_password = hash_password(new_password)
    cursor.execute('UPDATE users SET salt = ?, key = ? WHERE username = ?', (hashed_password[:32], hashed_password[32:], username))
    connection.commit()
    connection.close()
    print(f"Password reset successfully for {username}!")

def main():
    connection = sqlite3.connect('users.db')
    cursor = connection.cursor()

    # Create a table to store user credentials
    cursor.execute('''
    CREATE TABLE IF NOT EXISTS users (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        username TEXT UNIQUE NOT NULL,
        salt TEXT NOT NULL,
        key TEXT NOT NULL,
        attempts INTEGER DEFAULT 0
    );
    ''')

    connection.commit()
    connection.close()

    # Register a user
    register('alice', 'password123')

    # Login with the registered user
    login('alice', 'password123')

    # Try to register the same user again
    register('alice', 'password123')

    # Try to login with incorrect credentials
    login('alice', 'wrongpassword')

    # Change password
    change_password('alice', 'password123', 'newpassword456')

    # Login with the new password
    login('alice', 'newpassword456')

    # Reset password
    reset_password('alice', 'resetpassword789')

    # Login with the reset password
    login('alice', 'resetpassword789')

if __name__ == "__main__":
    main()