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Covert Secret Key Generation with an Active Warden. (arXiv:1901.02044v1 [cs.IT])
来源于:arXiv
We investigate the problem of covert and secret key generation over a
discrete memoryless channel model with one way public discussion and in
presence of an active warden who can arbitrarily vary its channel and tamper
with the main channel when an information symbol is sent. In this scenario, we
develop an adaptive protocol that is required to conceal not only the key but
also whether a protocol is being implemented. Based on the adversary's actions,
this protocol generates a key whose size depends on the adversary's actions.
Moreover, for a passive adversary and for some models that we identify, we show
that covert secret key generation is possible and characterize the covert
secret key capacity in special cases; in particular, the covert secret key
capacity is sometimes equal to the covert capacity of the channel, so that
secrecy comes ``for free. 查看全文>>