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Cake day: July 9th, 2023

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  • I’ve found HSBC to be ok using Firefox on Linux. I don’t know if they have integrations with any accounting software, but the web access works well, and you can export your transactions for processing locally.

    ETA: I’ve run small business accounting on Gnucash, I found the learning curve a bit steep, but once you ‘get it’ it’s handy.


  • Sorry for the slow reply, life occurred.

    I think I understand where you’re coming from with the desired to be productive and not reinstall. I think I’ve been there too! One thing that I can suggest, if you do have the time, is to learn a system like Ansible and use it to setup and configure your machine. The discipline of keeping all of the config as source rather than making ad-hoc changes reduces the chance of thinking you’ll make just one little change and breaking something, and, if something does go wrong, you can get back to your working configuration quickly.

    Bearing in mind that there really isn’t anything you can do to stop yourself if you’re really determined to not lose the data, because if you can read it at any time you can back it up, the closest you are likely to come is something like creating new key with GPG then using the TPM to wrap your secret key and deleting the original. That way the key is only usable on that specific machine. Then use the key-pair to encrypt your ‘guard’ files. You can still decrypt them because you have the wrapped secret keys and you’re on the same machine, but if you wipe the drive and lose those keys the data is gone. The TPM wrapping prevents you from taking the keys to a different machine to decrypt your data.

    There’s an article with some examples here,

    Having said all of that, this still doesn’t help if you just clone the disk as all of the data, including the wrapped key and the encrypted files will be cloned. The one difference there is that the serial number of the hard drive will be different. Maybe you could use that, combined with a passphrase as the passphrase for your GPG key, but we’re getting into pretty esoteric territory here. So you could generate a secret key with a command like:

    ( lsblk -dno SERIAL /dev/sdb ; zenity --title "Enter decrypt password" --password) | sha1sum | cut -c1-40
    

    Where /dev/sdb is the device your root partition is on. zenity is a handy utility for displaying dialogs, there are others available. In this use it just prompts for a passsword. We then concatenate the drive serial number from lsblk with the password you entered and hash the result. The hashing is really only a convenient way to mix the two without worrying about the newline lsblk spits out. Don’t record the result of this command, but use it to set the passphrase on your new GPG key. Wrapping the secret key in the manner the article above suggests is a nice extra step to make it harder to move the drive to another machine or mess around in that sort of way, but not strictly necessary as that wasn’t in the scope of your original question.

    Now you can encrypt your file with: gpg -e -r <your key name> <your file>'. That will produce an encrypted version of <your file>called<your file>.gpg. To decrypt the file you can get gpg` to use the hashing command from above to get the passphrase with something like:

    gpg -d --pinentry-mode=loopback --batch --passphrase-fd 3 <your file>.gpg 3< <( ( lsblk -dno SERIAL /dev/sdb ; zenity --title "Enter decrypt password" --password) | sha1sum | cut -c1-40 )
    

    Once you’ve tested that you can decrypt the file successfully you can remove the original, plaintext, file. Your data is now encrypted with a key that is secured with a passphrase made of a string you know and the serial number of your disk and optionally wrapped with a key from the TPM that is tied to your physical machine. If you change the disk or the machine the data is irretrievable (ignoring the caveats discussed above). I think that’s about as close to your original goal as you can get. It’s rough around the edges, and I’m not sure I’d trust my data to it, but I believe it’ll work. If you do something like this, please test it thoroughly, I can’t guarantee it!



  • notabot@lemm.eetoScience Memes@mander.xyzWhales
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    6 days ago

    Well yes, humpback whales reach sexual maturity by around 10 years of age (some much before then it seems). A marine biologist is still practically in it’s larval form at that point.

    (Yes, yes, I know that wasn’t what you meant, but I couldn’t help myself)


  • I was more suggesting that it might be a bit eldritch, but sometimes humor doesn’t come across quite right/

    The linked paper is focused on studying the ‘perforation-type anchor’ they use to hold the tissue to the mold as it grows, rather than keeping it alive afterwards. During growth the tissue and mold were submerged, or partially submerged, in a suitable medium to keep the cells healthy, and it was only when the resulting models were tested that they were removed (although one test did seem to involve letting it dry out to see if the anchors held). Growing the various layers of cells seems to be a solved problem, and I suspect that includes keeping them supplied with nutrients and such, so the authors aren’t examining that. What’s not solved is how to keep the tissue attached to a robot, which is what the authors were studying.





  • I guess you could, although the gripper would add a bit of mass to the drone. You still lose some energy from the round into the yeeted barrel, but not as much as having an open breech. Depending on the mass of the projectile vs the mass of the barrel that could be a worthwhile trade-off.



  • This seems like a very complicated way to achieve your goal! It sounds like sitting yourself down and giving you a stern talking to might be a beter aporoach.

    Having said that, if you have these very important files that you don’t want to lose, please make sure they’re backed up somewhere off of your machine. Storage fails, and it’s a horrible feeling losing something important. Unfortunately doing so would defeat the approach you’re thinking of.

    This might be a case of needing to reframe the question to get to the cause of the issue, and then solve that. So, why do you want to make it hard to reinstall your machine? Is it the amount of time you spend on it, the chance of screwing it up, needing it working, has it become a compulsion or something else? Maybe if we can get to the root of the issue we can find a solution.

    With regard to TPM, it’s basically just a key store, so you can use it fir anything really, althought it’s normally used by generating a TPM key and using it to encrypt the key that’s actually used to encrypt your data, storing the encrypted key with the OS. Just reinstalling won’t wipe the TPM, but unless you made an effort to save the encrypted key it’ll be gone. Given your problem statement above it just adds to the data you’d need to save, which isn’t helpful.






  • Ok, I’m still not clear on exactly what you’re trying to achieve as I can’t quite see the connection between somehow preventing certain files being duplicated when cloning the disk and preventing yourself from reinstalling the system.

    Bear in mind that reinstalling the system would replace all of the OS, so there’s no way to leave counter-measures there, and the disk itself can’t do anything to your data, even if it could detect a clone operation.

    If what you’re trying to protect against is someone who knows everything you do accessing your data, you could look to use TPM to store the encryption key for your FDE. That way you don’t know the password, it’s stored encrypted with a secret key that is, in turn, stored and protected by your CPU. That way a disk clone couldn’t be used on any hardware except your specific machine.


  • Nothing can prevent a disk clone cloning the data, and there’s no way to make something happen when a disk is cloned as you’re not in control of the process.

    If you wish to mask the existence of the files, use either full disk encryption, in which case cloning the disk doesn’t reveal the existence of the files without the decrypt password, or use a file based encrypted partition such as veracrypt in which case the cloner would just see a single encrypted blob rather than your file names.

    Ultimately encrypting the files with gpg means they have already effectively ‘destroyed or corrupted’ themselves when cloned. If you don’t want to reveal the filenames, just call them something else.

    If you could be a bit more specific about your threat model people may have better ideas to help.


  • I don’t think that’ll do it. The propellant deflagration is so quick that the momentum of the drone means it can’t be accelerated backwards enough to significantly reduce the force on the airframe. Even if it did, that would just end up applying the acceleration to the internals such as the batteries and motors/engine instead. I think you would need a spring damper that would allow the weapon to recoil quickly and dissipate the energy more slowly, and I’m not sure you could make obe effective on something the size of a drone.


  • I was thinking about those, but I understand they tend to suffer from inaccuracy due to even slight imperfections in the manufacturing of the jet openings.

    I think something more like a conventional round, with a heavier casing and more propellant might work. The casing gets ejected backwards and the projectile forwards, without imparting momentum to the barrel. You do need more propellant to get the same muzzle velocity though.


  • I’d imagine the shock loading into the drone’s structure would soon damage it if it was powerful enough to flip it. You’d need a significant damper to spread the shock out over a longer period. Alternatives are either recoilless rifles as suggested or something more akin to rockets, basically a tube that’s open at both ends, with a round that has enough propellant to fire without the need for a breech, and electronic ignition.