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Joined 3 年前
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Cake day: 2023年7月1日

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  • Fun fact: you can actually do mitm-proof end to end encryption between a web server and a client: TLS client authentication. It’s tricky to set up, so this is more useful for e.g. small private web servers with tech savvy users. Any mitm would require cooperation of at least one party.

    In windows you manage certs with start / run / mmc, then add snap-in and pick certificates, local machine or current user. And then usually the browser requires you to whitelist the domain so it’ll be allowed to ask for a cert.

    You still have to coordinate to exchange cert identities (thumbprint ideally, CN if you really have to).





  • Like, to find the canonical DNS name of one of my home lab IPs, 209.180.104.202, you search for a PTR record for 202.104.180.209.in-addr.arpa. (You get git.mspencer.net. Note my username here.) The first A in ARPA stands for something. (That’s how you know I’m not a bot - bots don’t have 25-year-old domain names. . . . I didn’t say I was interesting, I just said I’m not a bot. :-) )

    We don’t own it though. We never should - too much concentrated wealth and corruption. Like many technology stories, big wealth (whether Cold War military spending or giant corporations using money to squeeze out more money) creates something for one purpose, but people adapt and convert it for a better purpose. Business computing tech becomes home computing or gaming tech. Military redundant communications research becomes public redundant communication infrastructure.










  • Was it just surging or like a compressor stall or something? FOD like a bird ingestion or something?

    I mean, Boeing has/had quality problems, serious ethical failures, but also birds exist.

    (I’m not good at explaining this, maybe should have found an explanation online somewhere instead.) You know those stages of a combustion engine - intake, compression, ignition, exhaust, all happening in sequence in an engine’s cylinders? Turbine engines do them too, but in a straight line and constantly. The front of the engine is obviously intake, but compressor fans do the compression just using fast and powerful fans, no seals or valves needed. Ignition lights everything up, exhaust can just flow out the back. (It flows over some more fan blades that steal some power from the expanding gases and use it to keep the whole thing spinning.)

    Unless something goes wrong with the compressor fan blades, that is. If compression is too weak and the ignited air/fuel mixture can flow back out the front of the engine, that’s bad. And yeah, it happens sometimes, with any engine. Almost never with both at the same time. (Both engines failing at once low to the ground is like a once in a generation thing, and yeah it’s really really bad. And really really rare.)