When using Configuration via Protocol (CvP) Initialization mode, the periphery image generated by the Convert Programming Files tool is unencrypted.
When the anti-tamper bit is set on a device which supports design security, only encrypted files may be used to configure the device.
However, the unencrypted periphery image file may be used with a device where the anti-tamper bit has been set but the .rbf (raw binary file) that is used for the core image and is downloaded using the PCI Express® interface must be encrypted using the correct key.