Yes, FPGA-based, and no ring oscillators. AWS doesn't allow you to use latches or comb loops at all, but has the same area efficiency as the best RO-based designs. We'll publish eventually.
For the FPGA users out there - we will be packaging a few shapes of RNGs as IP in the near future, but this kind of chip/FPGA IP needs a LOT of very subtle verification, which made a lot more sense to do for full cards first.
For the FPGA users out there - we will be packaging a few shapes of RNGs as IP in the near future, but this kind of chip/FPGA IP needs a LOT of very subtle verification, which made a lot more sense to do for full cards first.