代码：

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);

然后在客户端用一个javascript个函数对Cookie做Base64解码，但得到的是乱码，看来是加过密的，有办法解密吗？