secret

A minimalistic C implementation of Shamir's secret sharing scheme.

Building

$ gcc -o secret secret.c

Usage

• Splitting a secret in n = 5 shares, so any k = 2 shares are needed to reconstruct it:

% ./secret split 5 2
Enter your secret: this is a secret!
Shares:
3cb1c0dcc4b246f103c7060e6de4c9ee2c3357
15d09d8380eb2c7033db80ea01d3d783d5f018
8c6d3e21a24a19bd2bd5c3983745d838241cb2
7f660453f1e04504b10886bab3234d98ff2eb6
b5fe793fc5bf0dad32e699a9c816b266878052

• Joining k = 2 shares to reconstruct the original secret:

./secret join 15d09d8380eb2c7033db80ea01d3d783d5f018 b5fe793fc5bf0dad32e699a9c816b266878052

Reconstructed secret: this is a secret!

License

MIT.