neat little fact about CRCs and stream ciphers: if you append a CRC to a message, you always get the same CRC.
if you encrypt the resulting message with a stream cipher, the CRC of the message is cancelled out so you essentially get the CRC of the keystream. as a result, if you encrypt 2 different files of same length with CRC appended with the same (unsalted) key, you get the same CRC on the encrypted file

Once upon a time in 1993 I was a teen, and I wrote a Pascal compiler for transputer. I was learning so many things. I've wrote an article about it, and released the code, along a newly coded transputer emulator 😉 #retro #transputer https://nanochess.org/pascal.html

when it comes time to assemble this thing, future-joey owes me a beer for being so thoughtful

Thanks for your attention,
it was fun!
I crafted a working Doom polyglot:
Dos executable, Portable executable and PDF.
https://www.youtube.com/live/nG2RZrD4kAo?si=iyU-4ce8xTIfC3o6

@travisgoodspeed in case you haven't seen this yet: https://aus.social/@projectgus/113777912133204503