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Joined 1 year ago
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Cake day: June 22nd, 2023

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  • Don’t know about Signal but the way PFS usually works is there is something like a Diffie-Hellman (DH) key exchange. Each person generates a random (private) number, remembers it, crunches it mathematically into a public number, and sends the public number to the other person. Each then combines their private number with the public number that they got from the other person, and this (because of how DH works) cleverly gives both people the same secret number they use for the encryption, but the secret can’t be reconstructed without knowing at least one of the private numbers. Finally, the PFS part is simply that each person permanently deletes both the shared secret and the private number they generated for that exchange (they will create new ones next time they want to communicate). That means there is no way to reconstruct the secret and re-decrypt the message.

    Of course, authentication also has to be added to all this.

    For more info, probably easiest to look up Diffie-Hellman key exchange online.


  • I don’t care much about any of these technical intricacies regarding word matching. I want Lemmy to be a human institution, which means no bots editing people’s posts beyond possible spam control. If there is a serious trolling problem featuring specific keywords in a community, I’m fine with a moderator manually kicking off some automatic action to remove a bunch of posts at the same time. But we don’t need robot nannies surveilling and messing with all of our posts.


  • Here’s another example, not from here. Before celullar phones, before television, before broadcast radio and even before the telephone, there was the telegraph. Communications with it were done in Morse code, by operators tapping away on telegraph keys. Telegraph keys were typically made of brass, and people who used them all day were called “brass pounders”. That profession is long since obsolete, but there are still ham radio enthusiasts who use Morse code as a hobby, and there is a group of them called the BPL, for “Brass Pounder’s League”. There are also people who simply try to honor the history of the venerable telegraph even though they recognize it as being a relic from the bygone era.

    Anyway, where am I going. Someone started a pretty good site about telegraphy and telegraph keys, called “brasspounder.net” which was a really cool name. Unfortunately Google’s algorithm seems to have classified that name as that of a porn site, because it saw the word you get if you ignore the “br” at the beginning, leaving “ass pounder”. Whoops. The site ended up changing its name to telegraphy.net, which is fine but less evocative in my opinion. Oh well.

    The above is an example of the so-called Scunthorpe problem. Let’s see if Lemmy has that too.