The rng-tools
package can be installed with the following command:
$ apt-get install rng-tools
rng-tools provides hardware random number generator tools, such as those used in the formation of x509/PKI certificates.
The Hardware RNG Entropy Gatherer service should be enabled.
The rngd
service can be enabled with the following command:
$ sudo systemctl enable rngd.service
The rngd service feeds random data from hardware device to kernel random device.