DavidBuchanan

5 ms·

1.
by DavidBuchanan 5y ago
It's with HostUS. I got a coupon a few years ago (via LowEndBox), and it's been renewing at the same rate ever since. I have no complaints about them, but I'm not sure you can get the same pricing today.
2.
by DavidBuchanan 5y ago
Server seems fine, I think it just doesn't work on Safari
3.
by DavidBuchanan 5y ago
Author here - this was just a quick PoC, I'm pleasently surprised that it seems to be handling all the HN traffic. It's served from a python script using aiohttp, behind nginx, on a $16/year VPS. I might make a github repo wi
4.
Show HN: Tweetable Polyglot PNGs: Pack a ~3MB Zip File into a Tweet(github.com)
1 points by DavidBuchanan 6y ago|0 comments
5.
Crafting a PNG that's only visible via Twitter's downscaler(twitter.com)
4 points by DavidBuchanan 6y ago|0 comments
6.
Retrofitting USB-C to an iPod Nano(hackaday.com)
6 points by DavidBuchanan 6y ago|1 comments
7.
by DavidBuchanan 6y ago
This is my "textbook" implementation of AES128, which follows the FIPS specification as closely as possible (in python): https://github.com/DavidBuchanan314/aes-playground It also includes from-scratch Galois
8.
by DavidBuchanan 6y ago
Here's my writeup/solution for the same challenge, represented as a diagram: https://twitter.com/David3141593/status/1253122980525334529
9.
by DavidBuchanan 7y ago
This was recently suggested to me on Twitter, I'll have a look at implementing it tomorrow. https://twitter.com/arnaud_lb/status/1212512382859251712
10.
Show HN: dlinject.py – Inject a .so into a running Linux process, without ptrace(github.com)
82 points by DavidBuchanan 7y ago|19 comments
11.
Abusing C macros to render the Mandelbrot Set at compile-time(gist.github.com)
131 points by DavidBuchanan 8y ago|21 comments
12.
by DavidBuchanan 8y ago
It isn't massively complex, but it did require some custom encoding/decoding logic. I plan to write a blog post on this some time soon...
13.
by DavidBuchanan 8y ago
Not quite, ICC profile chunk size limits.
14.
by DavidBuchanan 8y ago
And yet, nobody has done the same for Twitter until now. The difference is that twitter applies a series of operations to all uploaded image, stripping EXIF data, recompressing, etc., which would normally be difficult to work around.
15.
by DavidBuchanan 8y ago
> The main issue with RDTSC is that task-switches may cause your thread of execution to change cores or mess up your timing I got around this by running my benchmarks in a kernel module, with interrupts disabled. Obviously this is only p
16.
by DavidBuchanan 9y ago
I performed an experiment based on this idea - I wired up a clicky relay to the numlock LED (via a transistor), and glued it to a decent Dell keyboard. Then, I rigged up a python script to toggle the numlock led on each key press/relea
17.
by DavidBuchanan 9y ago
Amusingly, loading that page takes up 897kB.
18.
by DavidBuchanan 9y ago
How do busses work without tri-state logic?
19.
by DavidBuchanan 9y ago
I wouldn't categorise security as an "arbitrary concern".
20.
by DavidBuchanan 9y ago
Here's my take on libfaketime, which hooks also hooks syscalls: https://github.com/DavidBuchanan314/TARDIS It isn't intended for any kind of serious usage, I mainly just wanted to understand ptrace and LD_PRE
21.
EternalPetya – yet another stolen piece in the package?(blog.malwarebytes.com)
20 points by DavidBuchanan 9y ago|0 comments
22.
by DavidBuchanan 9y ago
I wrote a simple extension to disable the new direct image link behaviour: https://github.com/DavidBuchanan314/imgur-anti-anti-hotlink
23.
Show HN: TARDIS – Warp a process's perspective of time by hooking syscalls(github.com)
77 points by DavidBuchanan 9y ago|28 comments
24.
by DavidBuchanan 10y ago
One thing I'd recommend is to try to find some 5V erasable EEPROMs, so you can reprogram it in-system wthout having to transfer it over to a dedicated (and expensive) programmer. I went with a 12V-EEPROM at the time, so I had to write
25.
by DavidBuchanan 10y ago
I built my SBC without any prior experience. You pretty much just have to connect all the adress and data lines, and then figure out the chip selection logic. I used an MC68B50 for the UART, which can still be found very cheaply on eBay.
26.
by DavidBuchanan 10y ago
Not really. You can get up to about 1Mhz on a breadboard, and my wire-wrap SBC works at 4Mhz without any issues. If you did run into timing issues, you could just underclock the whole thing.
27.
by DavidBuchanan 10y ago
Writing a 6502 emulator is also a lot of fun! Shameless plug: https://github.com/DavidBuchanan314/6502-emu
28.
A very simple BIOS/MBR bootkit demo(github.com)
3 points by DavidBuchanan 10y ago|0 comments