The letter has been authenticated by handwriting experts.

这封信已由笔迹专家证明是真的。

Experts have authenticated the writing as that of Byron himself.

专家鉴定这字迹是拜伦的亲笔。

The user is now successfully authenticated.

用户现在成功进行了身份验证。

Authenticated Requests with Expiration time.

带有到期时间的认证请求。

Which will return the authenticated username.

这将会返回认证的用户名。