this post was submitted on 12 Jun 2025
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Privacy

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This is for pedagogical purposes. Please do not cypher actually important messages with this.

Anyway I think it can bring with little ones, and adults alike, interesting conversations around :

  • secrecy
  • privacy
  • cryptography as counter-power
  • mathematics, starting with modulo
  • the duration a message can stay undecipherable and thus the kind of message to share
  • computational complexity, how many permutations are available

... and a lot more!

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[–] [email protected] 8 points 16 hours ago (2 children)

Is this quantum-resistant?

[–] [email protected] 1 points 5 hours ago

Doubt I can do a PR to https://github.com/open-quantum-safe/ with that yet... but that does beg the question, what other schemes could be represented tangibly without complex mechanisms?

[–] [email protected] 16 points 16 hours ago (1 children)
[–] [email protected] 5 points 16 hours ago

good enough.

[–] [email protected] 2 points 13 hours ago

Caesar liked this post.

[–] [email protected] 11 points 1 day ago (3 children)

This is meant for simple replacement algorithms like ROT1, ROT13 etc. right?

[–] [email protected] 9 points 1 day ago (1 children)

Actually no I use it for CRYSTALS-Kyber /s

Yes, just joking it's not even meant for a "replacement" but rather how to give a pragmatic affordable (the 1st one I made was literally just 2 paper strips and scotch tape) fun way to explore ROT... but IMHO it can be just a starting point. You can do that and sequence them, e.g. ROT-X where X is the date so e.g. today is 06 12 2025 so you would ROT0 the first letter, ROT6 the second, etc.

It is only meant to be fun, please don't use this in actual serious situations.

[–] [email protected] 3 points 18 hours ago

FWIW changing ROT is https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher as @[email protected] pointed out, I already learned something!

[–] [email protected] 7 points 1 day ago (2 children)
[–] [email protected] 3 points 19 hours ago (1 children)

It could also be a Vignere cipher

[–] [email protected] 3 points 17 hours ago (1 children)
[–] [email protected] 2 points 16 hours ago

thanks, unlucky Rich

[–] [email protected] 6 points 1 day ago

More specifically, the bracelets are lined up for rot13.

It might be more fun to print two randomly ordered bracelets that need to be lined up correctly to en/decipher a message.

[–] [email protected] 1 points 1 day ago

That would make sense, if it's educational then it's probably used to teach about the Caesar/shift cipher

[–] [email protected] 1 points 1 day ago

. . . puns like:

decyphering