felixd / entropy

Entropy Playground

Entropy

Entropy Playground

Go lang

Check go/ directory for Go Lang examples

Online Entropy Sources

• Our service https://random.flameit.io
• https://www.fourmilab.ch/hotbits/secure_generate.html
• https://www.fourmilab.ch/hotbits/statistical_testing/stattest.html
• https://qrng.physik.hu-berlin.de/

Hardware TRNG / Generators

• http://holdenc.altervista.org/avalanche/
• https://betrusted.io/avalanche-noise.html
• https://github.com/jongrover/true-random
• https://www.mdpi.com/1099-4300/23/3/371

vanheusden.com

• https://www.vanheusden.com/crypto/entropy/

• audio entropy daemon aed - produce entropy from audio (from an alsa device)

• video entropy daemon ved - produce entropy from video (from a video4linux device)

• timer entropy daemon te - produce entropy by comparing timers

• entropy broker entropybroker - distribute (securily) entropy data from and to systems

• https://en.wikipedia.org/wiki/RDRAND

Entropy Evaluation

Data

• Webcam/CCTV Random Number Generator results ~100 MB: https://servertest.online/entropy/20230825-185423-3cdd

• /dev/urandom 4GB (Linux vpn-s 5.4.0-156-generic #173-Ubuntu SMP Tue Jul 11 07:25:22 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux) https://servertest.online/entropy/20230825-134528-9c3c

• macOS https://servertest.online/entropy/20230825-132329-7d78

• 8 GB file from Raspberry Pi (HWRNG) https://random.flameit.io https://servertest.online/entropy/20230828-142930-3f30

• 1 GB Quantum Device (EU university): https://servertest.online/entropy/20230827-115443-4324

• 8 GB Quantum Device (EU university): https://servertest.online/entropy/20230828-160630-5912

• https://rsmith.home.xs4all.nl/howto/fun-with-encryption-and-randomness.html

Weak RNG (Widespread Weak Keys in Network Devices)

• https://factorable.net/

Knowladge

• https://people.eecs.berkeley.edu/~daw/rnd/
• https://hackaday.com/2017/11/02/what-is-entropy-and-how-do-i-get-more-of-it/
• https://www.kicksecure.com/wiki/Dev/Entropy#Quality

Software

• US NIST.gov https://github.com/usnistgov/SP800-90B_EntropyAssessment

Other things

• https://servertest.online/entropy

• https://wiki.alpinelinux.org/wiki/Entropy_and_randomness

• https://rsmith.home.xs4all.nl/howto/fun-with-encryption-and-randomness.html

• https://webhome.phy.duke.edu/~rgb/General/dieharder.php

• https://medium.com/unitychain/provable-randomness-how-to-test-rngs-55ac6726c5a3

• https://www.kicksecure.com/wiki/Dev/Entropy#Quality

Linux

• https://systemd.io/RANDOM_SEEDS/
• https://research.nccgroup.com/2019/12/19/on-linuxs-random-number-generation/

Software

sudo apt install rng-tools

felixd@vpn-s:~/rng/linux-ent$ cat /dev/random | rngtest --blockcount=100000
rngtest 5
Copyright (c) 2004 by Henrique de Moraes Holschuh
This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

rngtest: starting FIPS tests...
rngtest: bits received from input: 2000000032
rngtest: FIPS 140-2 successes: 99925
rngtest: FIPS 140-2 failures: 75
rngtest: FIPS 140-2(2001-10-10) Monobit: 10
rngtest: FIPS 140-2(2001-10-10) Poker: 11
rngtest: FIPS 140-2(2001-10-10) Runs: 27
rngtest: FIPS 140-2(2001-10-10) Long run: 28
rngtest: FIPS 140-2(2001-10-10) Continuous run: 0
rngtest: input channel speed: (min=5.116; avg=4125.041; max=19073.486)Mibits/s
rngtest: FIPS tests speed: (min=4.608; avg=146.269; max=150.185)Mibits/s
rngtest: Program run time: 13512568 microseconds

Quantum Random

https://pypi.org/project/quantumrandom/

Since Kernel 5.18

Since Kernel 5.18 /dev/random and /dev/urandom are the same thing

Finally I have been able to find more explanation on what happened. You can read commit message from Kernel.org explaining situation:

More explanation: https://lwn.net/Articles/884875/

• https://lore.kernel.org/lkml/[e-mail]/T/#u
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ac2ab99072cce553c78f326ea22d72856f570d88
• https://www.theregister.com/2022/03/21/new_linux_kernel_has_improved/
• https://kernelnewbies.org/Linux_5.18#Security

Monitoring

echo 1 > /sys/kernel/debug/tracing/events/syscalls/sys_enter_getrandom/enable
cat /sys/kernel/debug/tracing/trace_pipe 

Author

• Paweł 'felixd' Wojciechowski - FlameIT - Immersion Cooling