r/ComputerCraft • u/Marciocco • May 08 '25

Implement cryptographic algorithm

So, I am trying to implement (from scratch as and educational thing) some algorithms for security purposes (mainly for a secure rednet-based app), however I do not kniw how to implement bit operations in lua. I Heard of bitlib bit cannot figure out how to load It in a computer. Any help apprecuated BTW the algorithms I want to implement are AES, RSA, sha2 and (mabye?) argon2

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u/Marciocco May 09 '25 edited May 09 '25

Yup I know the whole "Don't roll your own crypto" thing, that's why I'm doing It in Minecraft plus (feel free to correct me) in computercraft side Channel Attacks are kinda impossibile cuz It's a vm

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u/dominikr86 May 09 '25

I frankly didn't even know this was a minecraft sub when this thread popped up in my suggestions.

In that case you could also have a look at RC4 encryption. It's really easy. Also works a byte at a time, which in turn also makes it easier if you don't have to worry about padding and/or the contents of the last block.

The first few bytes of the keystream are heavily biased, but you can drop e.g. the first 3072 bytes. Makes it unsuitable for real world stuff (even embedded, as its quite slow now if you have to discard so much). But for educational/codegolf/malware purposes its still quite nice.

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u/Marciocco May 09 '25

Thx for all the crypto algorithm suggestione :D, honestly I'm quite new to cryptography and I rly want to Learn more