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44 lines
1.2 KiB
Markdown
44 lines
1.2 KiB
Markdown
# Entropy
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Generating cryptographic keys needs a lot of entropy. Especially `gnupg --gen-key`
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depletes the kernel entropy pool (`/dev/random`) quite fast and may appear to be
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stuck when it's waiting for new entropy.
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If you wonder how to speed this up consider installing `rng-tools`
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if this is available on your platform.
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After installing `rng-tools` please make sure `rngd` is actually running and
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replenishing your entropy pool.
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You can do so by keeping a watch on your available entropy and running an entropy
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consuming process as follows:
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```bash
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watch -n1 cat /proc/sys/kernel/random/entropy_avail
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# switch to another terminal / screen
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cat /dev/random | rngtest -c 1000
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```
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The second command should complete within a few seconds and report no errors.
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If it takes much longer you probably don't have an hardware RNG and will have
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to generate some entropy by triggering some network activity and input.
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You should avoid `havaged`.
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### Debian / Ubuntu
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```bash
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sudo apt-get install rng-tools
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```
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### CentOS / Fedora / Red Hat
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```bash
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sudo yum install rng-tools
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```
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## Further Information
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* [RNG-Tools on the Arch Linux Wiki](https://wiki.archlinux.org/index.php/Rng-tools)
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* [gopass Issue #486](https://github.com/gopasspw/gopass/issues/486)
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