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Happy 19th birthday, Linux Mint! 🥳🎂

Drop a 💚 if Mint was your first distro!

#linux #linuxmint

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oxo boosted

Making steps into the right direction with my Rijndael cipher script. Almost done now with the key expansion and the so called g-function. Last step is implementation of the round constants.
When that is done I 'only' have to put all the stuff in a proper loop. If that works I will be happy, but the journey will not end there. A lot of testing and see how to decrypt...
😃

codeberg.org/oxo/tool/src/bran

oxo boosted

Looking for a libre alternative to Desmos online graphing calculator? (desmos.com/calculator)

I found grapk.tk!

It used to be on graph.tk, but that address no longer works - yet the name of the project remains.

So it's now here:
graph.equation.io/

Source on Github:
github.com/aantthony/graph.tk

#maths #math #graphs #gnuplot #calculator #graphingCalculator #equation #Desmos #alternative #foss #opensource #libre #freesoftware

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DSEG is a family of free (and open-source) fonts of 7- and 14- segment displays. These allow for designing gorgeous digital displays!

keshikan.net/fonts-e.html

#Font #GraphicDesign #Digital #Design #Inkscape

Finally found my way through the Galois Fields.
The mix-colums part of the Rijndael key scheduler is done now.
Next up: generating round keys.

codeberg.org/oxo/tool/src/bran

In my 'baes' :) project I am struggling with Galois Fields and get field-exceeding values properly calculated.

I am home now and suddenly it struck me that probably the solution can be (note-to-self):

After multiplication with the irreducible polynomial, use a mask and a bitwise AND to keep only the lower 7 bits of the final result value.

I.e.:
value=0xA3F
mask=0x7F
result=$(( value & mask ))
So then the result will become: 0b00111111

Hopefully this will work...

codeberg.org/oxo/tool/src/bran

The substitution box, one of the steps in key scheduling for the Rijndael cipher, is working.

The table is in hexadecimal, therefore some sub-optimal conversion is going on. But it works for now.

Still far away from fully working, but I am still making good progress each time I work on this project.

Next up: bitwise row and column shifting.

codeberg.org/oxo/tool/src/bran

Steadily on my way builing an Rijndael-esque encryptor.
Building upon my shell script; yesterday I made an 256 bits sustitution table.
Today I made the foundation of a key scheduler. Interestingly bash is able to process 4×4, 6×4 or 8×4 matrices. And the code is still quite simple. I am learning a lot and enjoying all the little puzzles to solve!
Follow my progress on .
codeberg.org/oxo/tool/src/bran

Duck.ai is not able to generate a complete substitution matrix from the Rijndael cipher. It starts off promising, but then gets stuck about halfway. I asked it to generate the table from the halfway point and it did. But it made up the values it produced.

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Cut the endoding from my shall script. Also adjusted to a non-redundant key length for the last chunk of input into the xor function.
Next hurdle: proper key rotation...
Will upload my progress to the repos asap.

The command has a wrap option. If it is set to 0 then you basically have created a base64 stream (without any EOL's). Which comes in handy for my project.
Development btw is published when I have internet connection;
codeberg.org/oxo/tool/src/bran
Enjoy your day!

I realized that is not easy. Adjusted my goal from building a full blown Rijndael to a more simple xor block cipher. For educational purposes only!

Now I am more or less ready with the encoding of the input ( and ), conversion to and then creating codes. Then the plaintext has to be split into 16 byte blocks, which are to be -ed with the key.

Todo: key-rotation, to make the algorithm stronger.

Today I learned: all the above. But especially how valuable base64 encoding is for converting non-ASCII characters.

Okay, I now want to write the Rijndael algorithm (AES) in bash.
Is that even possible?
Any suggestions appreciated!
Wish me luck. 😃

isolatest, the tool to download an up-to-date archiso has been moved to hajime, the archlinux installation tool.

Please update your local repos and have a nice day!


codeberg.org/oxo/hajime/src/br

oxo boosted

The Emacs Writing Studio paperback version is out now. Available through your favourite book retailer.

Emacs Writing Studio is a configuration that converts Emacs into a too for research, note-taking, writing and publishing books.

This paperback was fully produced with Emacs, except for the cover.

The configuration and Org mode files are freely available on GitHub:

github.com/pprevos/emacs-writi

#emacs #writing

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