if CE Authentication Key

1.3.6.1.4.1.311.1.11.2.2.1.12

The value to be used as the Authentication key whenever the corresponding instance of ifCEAuthenticationType has a value other than noAuthentication. A modification of the corresponding instance of ifCEAuthentiationType does not modify the ifCEAuthenticationKey value. If a string shorter than 16 octects is supplied, it will be left-justified and padded to 16 octects, on the right with nulls (0x00). Reading this object always results in an OCTET STRING of length zero; authentication may not be bypasssed by reading the MIB object