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To improve the protection of your cookie, you may want also set the AnonymousIdentificationSection.CookieRequireSSL property to true.
Be sure to use the default value for this property if you want both data validation and encryption to help protect the cookie. This option uses the configured data-validation algorithm, based on the <machineKey> element. Triple-DES (3DES) is used for encryption, if available and if the key is long enough (48 bytes or more).