Re: How to safely split mnemonic seed

You may want to give Shamir's Secret Sharing Scheme a look.

Code:

$ electrum getseed
{
"mnemonic": "flicker determine hand lot slowly world busy find character vain roam gift",
"seed": "168c6cdde03ce18aebc73e139b10b0b7",
"version": 4
}

Code:

$ ssss-split -t 2 -n 2
Generating shares using a (2,2) scheme with dynamic security level.
Enter the secret, at most 128 ASCII characters: flicker determine hand lot slowly world busy find character vain roam gift
Using a 592 bit security level.
1-c13342dec5abc18db404094767c9e4900a0c28e4792e3e8f3af3227159af1bcb7df38e7e74a638293fd0b644a1515c477c25451b152bf9ffaa192f52620f19949db9b2a82b6617726340
2-4c41df29db5f35d873039d71983b67b96b9a856fbc83ba23c9f9b33980ebf804f791edcb955e23a6aa8f8cdd8f4e887da4a56caa0b02f4bafff38d26b4e60b18cdc50210c81d03497586

Code:

ssss-combine -t 2
Enter 2 shares separated by newlines:
Share [1/2]: 1-c13342dec5abc18db404094767c9e4900a0c28e4792e3e8f3af3227159af1bcb7df38e7e74a638293fd0b644a1515c477c25451b152bf9ffaa192f52620f19949db9b2a82b6617726340
Share [2/2]: 2-4c41df29db5f35d873039d71983b67b96b9a856fbc83ba23c9f9b33980ebf804f791edcb955e23a6aa8f8cdd8f4e887da4a56caa0b02f4bafff38d26b4e60b18cdc50210c81d03497586
Resulting secret: flicker determine hand lot slowly world busy find character vain roam gift

Make some QR codes.

Code:

function qrshow() { qrencode -s 10 "$1" -o - | display - ; }

Code:

qrshow 1-c13342dec5abc18db404094767c9e4900a0c28e4792e3e8f3af3227159af1bcb7df38e7e74a638293fd0b644a1515c477c25451b152bf9ffaa192f52620f19949db9b2a82b6617726340

Code:

qrshow 2-4c41df29db5f35d873039d71983b67b96b9a856fbc83ba23c9f9b33980ebf804f791edcb955e23a6aa8f8cdd8f4e887da4a56caa0b02f4bafff38d26b4e60b18cdc50210c81d03497586