  Recent research developments show that the concept of bidirectional relaying
significantly improves the performance in wireless networks. This applies to
three-node networks, where a half-duplex relay node establishes a bidirectional
communication between two other nodes using a decode-and-forward protocol. In
this work we consider the scenario when in the broadcast phase the relay
transmits additional confidential information to one node, which should be kept
as secret as possible from the other, non-intended node. This is the
bidirectional broadcast channel with confidential messages for which we derive
the capacityequivocation region and the secrecy capacity region. The latter
characterizes the communication scenario with perfect secrecy, where the
confidential message is completely hidden from the non-legitimated node.
