Schallbert's Blog

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Image: An SSH public key randomart image as visual fingerprint for humans to quickly see if public keys match

Hardware Security Key: add SSH

2026-05-03

Generate keys, configuration, test

Image: A brand-new hardware security key in its package on a table. The image has been altered; its colors are value-inverted.

Hardware Security Keys

2026-04-25

What Yubikey can do and its limitations

Image: Top page crop of OWASP''s Docker Security Cheat Sheet [Source, downloaded May-26](https://cheatsheetseries.owasp.org/cheatsheets/Docker_Security_Cheat_Sheet.html) [License](https://creativecommons.org/licenses/by-sa/4.0/)

act_runner rootless: no start

2026-03-28

Solving `/proc/self/exe: operation not permitted`

Image: A tapered engraving tool for stainless stell application

Engrave Stainless Steel A2 / AISI304

2026-03-08

Getting Feed, Speed, and Depth per Pass right