Edimax Technology HP-8500K (2pcs a set) - Manual (Page 11)

11
Setting Up Security on a Local HomePlug device
The Privacy tab will allow you to change the Network Password to the
unit that is currently connected to this computer. This network password
encrypts all data that is sent from this unit using
56-bit data encryption
standard (DES). The DES Encryption is very secure, and very difficult to
crack, therefore your home network is very secure, and very difficult to
breach your home network.
**Note** Every unit on your home network MUST have the same Network
Password for connectivity to be established throughout your home. The
default network password is “HomePlug”.