  This paper investigates and confirms one advantageous function of a power
packet dispatching system, which has been proposed by authors' group with being
apart from the conventional power distribution system. Here is focused on the
function to establish the security of power packet dispatching for prohibiting
not only information but also power of power packet from being stolen by
attackers. For the purpose of protecting power packets, we introduce a simple
encryption of power packets before sending them. Encryption scheme based on
chaotic signal is one possibility for this purpose. This paper adopts the
Differential Chaos Shift Keying (DCSK) scheme for the encryption, those are
partial power packet encryption and whole power packet encryption.
