代碼：FormsAuthenticationTicket authTicket = new                    FormsAuthenticationTicket(1,                    userInfo.UserName,                    DateTime.Now,                    DateTime.Now.AddMinutes(HttpContext.Current.Session.Timeout),                    false,                    roles);            string encryptedTicket = FormsAuthentication.Encrypt(authTicket);            HttpCookie authCookie =                new HttpCookie(FormsAuthentication.FormsCookieName,                encryptedTicket);            if (string.Compare(SolutionConfig.CookieDomain, "null", true) != 0)                authCookie.Domain = SolutionConfig.CookieDomain;            System.Web.HttpContext.Current.Response.Cookies.Add(authCookie);然后在客戶端用一個javascript個函數對Cookie做Base64解碼，但得到的是亂碼，看來是加過密的，有辦法解密嗎？