Lattice Diamond: Is there a difference in size between an encrypted and unencrypted FPGA bitstream?
Yes, there is a difference in size between encrypted and unencrypted bitstreams. An encrypted bitstream has additional overhead associated with the bitstream. Therefore an encrypted bitstream's size is slightly larger than an unencrypted bitstream. As a result, the download time for an encrypted bitstream is slightly longer than an unencrypted bitstream.