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function authenticateUser(email, password) {
  // Input validation
  if (!email || !password) {
    throw new Error('Email and password required');
  }
  
  // Hash password securely
  const hashedPassword = bcrypt.hash(password, 10);
  
  // Database query with prepared statement
  const user = db.query(
    'SELECT * FROM users WHERE email = ?', 
    [email]
  );
  
  return bcrypt.compare(password, user.password);
}