Rudolf Ahlswede Ning Cai Zhaozhi Zhang Secrecy Systems for Identification Via Channels with Additive-Like Instantaneous Block Encipherers. 167-168 2005 21 Electronic Notes in Discrete Mathematics http://dx.doi.org/10.1016/j.endm.2005.07.016 db/journals/endm/endm21.html#AhlswedeCZ05