Whonix 0.5.5 and above have haveged installed by default. (see below)
The Linux Kernel man page says: "[...] /dev/random should be suitable for uses that need very high quality randomness [...]".
Quoted from the riseup.net page about entropy: "[...] entropy-estimation is a black-art and not very well understood [...]".
While it would be good to be cautions, i.e. learning about the entropy quality in Virtual Machines and if required learning about methods to improve it, it's not a critical problem. Successful entropy estimation attacks have never been reported for any software.
- Gentoo wiki: Generating better random numbers
- HAVEGE: PolarSSL Security Advisory 2011-02
- Qemu: virtio-rng, virtual random generator
VirtualBox Bug Reports
It has to be researched if they do work well inside Virtual Machines (VirtualBox). Simply installing all of them may not be wise.
- entropy broker: Not in Debian.
- rng-tools: In Debian.
- timer_entropyd: Not in Debian.
- audio-entropyd: Not in Debian.
- video-entropyd: Not in Debian.
- clrngd: In Debian.
- ekeyd: In Debian.
- HAVEGE: In Debian. See below.
Haveged is an entropy gathering daemon.
Quoted from the haveged testing page: "[...] will behave similarly in a virtual environment is a more risky proposition [...] there have been reports of VM that implement the processor time stamp counter as a constant and there are known differences in cpuid operation in others. [...]"
Will haveged create sufficient entropy in VirtualBox? Luckily, haveged comes with tools to check the if the entropy it creates.
Makes sense to test entropy while haveged is disabled.
sudo service haveged stop
Get haveged sources and test.
apt-get source haveged cd haveged-* ./configure --enable-nistest make check ## perhaps repeat #make clean #make check
Should say something like
0 failed individual tests PASS: nist/test.sh ================== All 2 tests passed ==================
- This was successfully tested in VirtualBox without haveged running.
- This was successfully tested in VirtualBox with haveged running.
- This was successfully tested in kvm without rng device and without haveged running.
- This was successfully tested in kvm without rng device and with haveged running.
- This was successfully tested in Qubes without haveged running. 
- This was successfully tested in Qubes with haveged running.
Hardware Entropy Keys
Entropy Key; Hardware not fully open source. Some resources say, it's okay as an additional source of entropy. Where to add it? Since Whonix depends on a host operating system, the Whonix-Gateway and the Whonix-Workstation, where it does make most sense to add it? Perhaps adding it to the host and using a entropy broker could be the most effective method. Better than buying three entropy keys.
OneRNG; Hardware and Firmware fully open source. Firmware is cryptographically signed to ensure it hasn't been tampered with. Board has a removable tin RF Shield so you can verify the circuits match the diagrams provided by the manufacturer. Fully reprogrammable with manufacturer provided software+cable (must be bought separately). Where to add it? Since Whonix depends on a host operating system, the Whonix-Gateway and the Whonix-Workstation, where it does make most sense to add it? Perhaps adding it to the host and using a entropy broker could be the most effective method.
- Random Sequence Generator based on Avalanche Noise
- turbid - High-Entropy Symbol Generator http://www.av8n.com/turbid/
- turbid - Debian RFP - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=59147
- On Linux entropy issues generally. Must read. - https://www.av8n.com/computer/htm/secure-random.htm
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