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I'd like to use a m out of n cryptosystem for storing sensitive data (2 out of 3 to be exact). I've learned from Wikipedia that it's called a threshold cryptosystem, but I haven't found any practical implementations.
For regular public key cryptography we have standards like PEM and implementations like OpenSSL ready to use. Is there something similar for m out of n cryptography? I would like to avoid having to invent my own ways to store (serialize) keys and encrypt them with a password. All of this is trivial to use with OpenSSL. And the worst thing would be relying on some homebrew implementation of a crypto algorithm.
I'm most interested in Python libraries, but I'd like to hear if there is a standard and an implementation in any language.
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Threshold cryptography takes its name from the idea that individual keyholders cannot open a lock on their own, as is common in conventional cryptography. Instead, out of a group of keyholders, there must be a minimum number of them — a “threshold” number — working together to open the lock.
Launched in January 2022, Threshold Network is the first-of-its-kind product of a merger between two decentralized protocols — NuCypher (NU) and Keep Network (KEEP) — to provide full security and privacy to its users.
Well, it's a homebrew implementation, but I think it's pretty good. And it's in Python. Take a look at http://programmingpraxis.com/2011/06/17/adi-shamirs-threshold-scheme/.
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