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We prove a regularized formula for the secret key-assisted capacity region ofa quantum channel for transmitting private classical information. This resultparallels the work of Devetak on entanglement assisted quantum communicationcapacity \cite{DHW05RI}. This formula provides a new family protocol, theprivate father protocol, under the resource inequality framework that includesprivate classical communication \it{without} secret key assistance as a childprotocol.

Secret Keys Assisted Private Classical Communication Capacity over Quantum Channels