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Authors: Thomas B. Preusser

Entity: TRNG - True Random Number Generator.

Description:

This module implements a true random number generator based on sampling combinational loops of interleaved X(N)OR gates.

Always verify the randomness of this TRNG implementation for your concrete target platform, for instance, using the dieharder test by Robert G. Brown [http://www.phy.duke.edu/~rgb/General/dieharder.php], which is also directly available for many GNU/Linux distributions, e.g. Debian. Ideally, randomness would be verified for varying operating conditions.

This design involves fast-switching combinational loops on purpose so as to serve as sources of entropoy. This implies a relevant local power consumption. Do not cramp large parts of a chip with these TRNGs without ensuring appropriate heat dissipation. It often requires special constraints or directives to enforce the proper synthesis of these combinational loops by the tools.

License:

Copyright 2007-2017 Technische Universitaet Dresden - Germany Chair of VLSI-Design, Diagnostics and Architecture

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and

limitations under the License.