1. 使用https加密传输登录信息。
2. 在后端对登录信息进行验证，并使用安全的密码存储方式，例如使用BCrypt或PBKDF2算法进行密码哈希。
3. 在前端使用AntiForgeryToken，可以防止跨站点请求伪造攻击（CSRF攻击）。ValidateAntiForgeryToken需要在登录表单中添加一个隐藏的__RequestVerificationToken字段，并在登录时作为参数传递给控制器，以确保请求来自与该站点相同的用户。
4. 做好账户锁定和密码重置功能，以防止暴力破解密码。
5. 使用Identity框架来处理用户验证，它内置了一些安全功能，例如密码哈希、账户锁定等。

代码示例： 后端验证登录信息和生成AntiForgeryToken：

[HttpPost]
[ValidateAntiForgeryToken]
public async Task Login(LoginViewModel model)
{
    if (ModelState.IsValid)
    {
        var result = await _signInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, lockoutOnFailure: true);

        if (result.Succeeded)
        {
            _logger.LogInformation("User logged in.");
            return RedirectToAction(nameof(HomeController.Index), "Home");
        }

        if (result.RequiresTwoFactor)
        {
            return RedirectToAction(nameof(LoginWith2fa), new { returnUrl = returnUrl, model.RememberMe });
        }

        if (result.IsLockedOut)
        {
            _logger.LogWarning("User account locked out.");
            return RedirectToAction(nameof(Lockout));
        }
    }

    ModelState.AddModelError(string.Empty, "Invalid login attempt.");
    return View(model);
}

[ValidateAntiForgeryToken]
public IActionResult Logout()
{
    _signInManager.SignOutAsync().Wait();
    _logger.LogInformation("User logged out.");
    return RedirectToAction(nameof(HomeController.Index), "Home");
}

[HttpPost]
[ValidateAntiForgeryToken]
public async Task ExternalLogin([FromBody] ExternalLoginViewModel model)
{
    var info = await _signInManager.GetExternalLoginInfoAsync();
    var result = await _signInManager.ExternalLoginSignInAsync(info.LoginProvider, info.ProviderKey, isPersistent: false, bypassTwoFactor: true);
    if (result.Succeeded)
    {
        _logger.LogInformation("User logged in with {Name} provider.", info.LoginProvider);
        return Ok();
    }
    if (result.IsLockedOut)
    {
        ModelState.AddModelError(string.Empty, "User account is locked out.");
        return StatusCode(StatusCodes.Status423Locked);
    }
    else
    {
        ModelState.AddModelError(string.Empty, "Invalid login attempt.");
        return BadRequest();
    }
}

[HttpPost]
[ValidateAntiForgeryToken]
public IActionResult ExternalLoginConfirmation([FromBody] RegisterViewModel model)
{
    return Ok();
}

[HttpPost]
[ValidateAntiForgeryToken]
public async Task Register([FromBody] RegisterViewModel model)
{
    if (ModelState.IsValid)
    {
        var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
        var result = await _userManager.CreateAsync(user, model.Password);
        if (result.Succeeded)
        {
            _logger.LogInformation("User created a new account with password.");
            return Ok();
        }
        AddErrors(result);
    }

    return BadRequest(ModelState);
}

[AllowAnonymous]
public IActionResult AccessDenied()
{
    return View();
}

[HttpPost]
[ValidateAntiForgeryToken]
public async Task Login(LoginViewModel model, string returnUrl = null)
{
    ViewData["ReturnUrl"] = returnUrl;
    if (ModelState.IsValid)
    {
        // 这里对登录信息进行了验证，并调用SignInAsync方法进行登录