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In addition to what Kelalaka said - there are also a few notable problems with your idea: Imagine that you have a friend that is willing to translate for you 2 messages of your choice from your language, to that secret language. Now, if the translation is deterministic, then next time you see one of the two translations, you know the "decryption" to your ...

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In short; $$\text{We are living in a world where it is ruled by Kerckhoffs's principles}$$ Decoding lost languages is not related to cryptography, though some techniques may be related like frequency analyzing. That is people tend to give names to some common objects like the sun, earth, man, women, child, etc. Does that mean that you can better protect ...

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Threshold signatures do not enforce accountability meaning a t-out-of-n threshold signature does not tell the verifier which $t$ of the $n$ signers created the signature. Multisignatures enforce accountability as the verifier learns which t signers created the signature. There does not need to be a threshold for multi-signatures. But n-out-of-n threshold ...

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Should I always call the key used for verification "public key" even on those settings? Usually it is a public key, or at least it is called that in the key pair generation procedure of the cryptosystem that is used. Public key is in that case a more generic term - it may not be decided for what the key will be used after all. Similarly, cryptographic API'...

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