vbrandl · HackerTrans

I would guess OSM uses optimizations for eucledian graphs, where the path a->c is always shorter than a->b->c. This restriction makes e.g. TSP solvable. But this property does not hold for any generic graph. I don't know if this makes visualisation also easier.

vbrandl

3년 전discuss

There is a virus written in awk that infects other awk scripts[0]. And according to wikipedia, the language is Turing complete.

[0]: https://github.com/SPTHvx/ezines/tree/main/dc5/CODES/Perfori...

vbrandl

3년 전discuss

That's the point of EurKey. Special characters are the same as on the US layout with additional, language specific letters available. At least for writing English and German it has been great for me.

vbrandl

3년 전discuss

Could you give some links or pointers (which city/building/year)? I know of the band but not that story.

vbrandl

3년 전discuss

Sounds like a botnet with extra steps

vbrandl

3년 전discuss

The linked paper is not my thesis but one of the foundational works, I based my thesis on. Mine can be found here: https://git.vbrandl.net/vbrandl/masterthesis/raw/branch/mast...

vbrandl

3년 전discuss

PageRank and similar ranking algorithms on graphs can be used to detect monitoring attempts in P2P botnets [0] (a botmaster can detect when researchers/law enforcement start monitoring a botnet).

For my master's thesis, I evaluated these algorithms and tried to find ways to prevent detection and came to the conclusion that it is hard if you don't want to deploy about as much sensor nodes as the botnet has active peers. Those algorithms are working really well and are hard do work around.

[0]: https://doi.org/10.1145/3098954.3098991

vbrandl

4년 전discuss

Maybe I did not use it as intended, but I have an app running on fly.io that exposed the metrics endpoint on another port as the webapp itself, so it is not publicly reachable. This app suddenly broke and I had to disable the metrics endpoint to get it running again. Since it is a toy project, I didn't investigate further but internally everything worked fine (the healthcheck got the expected 200 response) but the routing of external requests just broke.

Also when building and deploying an image, some non-obvious and undocumented changes are made. My app generates version information based on the git repository state. The build process deletes (or ignores, I don't know, never got an answer to my issue) the fly.toml file in the docker build context, which resulted in uncommitted changes and a "dirty" repository when building the app. My dirty workaround is to `git checkout fly.toml` in my dockerfile. It works but it isn't pretty...

vbrandl

4년 전discuss

Since I have no use for it, I like to globally (not just in vim) map caps to ESC.

vbrandl

5년 전discuss

here's an example I had a few month ago: Password Requirements, merging of requirements and generating passwords that fulfill the requirements:

- merging/combining of requirements is a monoid operation with an "empty requirement" (e.g. one that accepts every password) as the neutral element. Finding this requirement, I could write properties for the monoid properties (a + b = b+ a, a + 0 = a, and so on) - when generating a password from a requirement, the same requirement must accept the generated password (`requirement.accept(requirement.generate()`)

In general: if you find mathematical rules to your code (commutativity, associativity,. ..), these make a great starting point for property tests.

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