Currently I only have a ledgers, but I have been thinking of buying trezor too. Thanks, i will check it out.

The only thing i enter my private key into is a ledger/trezor. When I sign something, the private key never leaves those devices.

Thanks, i will look it up. I want to do it on pen and paper, so that I never have to type my hole private key into a computer. I do not have any good hardware that i do know for sure that no one has been hacked or spyed on in some kind of way.

The model is simply lots of one timpads combined in a way that that i only two parts to construct back to the original. I have found serval posts on rediit, bitcointalk etc that describe this method with 2 of 3, I have simply added more onetime pads and combined them to fit with 2 of 4

Do you have a link to scheme that is made and approved by cryptographer, that i am able to do with pen and paper and would require 2 of 4 parts? I would be more than happy to use that, but I have not been able to find it.

It appers to me that onetimepad is fairly commin way to encrypt. It will give no information about the seed, as long as it is truly random and the length of it is equal or larger than the orginal seed.
http://users.telenet.be/d.rijmenants/en/onetimepad.htm

I want to be able to construct the orginal back from only two parts, so if i am able to lose one or even to parts, i can construct it back anyway. I also want the extra security that if someone only find one they cant use it. If the hiding spot i was thinking of was a lot worse than i thougt and some people find it, i dont want them to be able to get any information from that and get acess to my fund. I know I need to construct them back one time, but i can do that mannualy, so the only thing I need to trust with my hole private key is ledger. But I think that is safe enough for me

I want to be able to construct the orginal back from only two parts, so if i am able to lose one or even to parts, i can construct it back anyway. I also want the extra security that if someone only find one they cant use it. If the hiding spot i was thinking of was a lot worse than i thougt and some people find it, i dont want them to be able to get any information from that and get acess to my fund. I know I need to construct them back one time, but i can do that mannualy, so the only thing I need to trust with my hole private key is ledger. But I think that is safe enough for me.

Hi, I want to split my private key/seed into 4 parts, and only need 2 to construct it back to original  I am thinking of using onetimepad for the encryption. My plan is to generate serval random 24 word seeds with bip 39.

A1, B1 ... is random  generatet, and A2,B2 is constructet so the equations are equal to S

I will add them word by word and use modulo 2048 if the number gets over 2048. I want to do this, so it is easy to do by hand, and so I dont need to trust on some software to do it correct. I will make serval equations and split them in different locations nr1, nr2 ... , as listet below


S=A1+A2
S=B1+B2
S=C1+C2
S=D1+D2
S=E1+E2
S=F1+F2

Nr1:A1B1C1
Nr2:A2D1E1
Nr3:B2D2F1
Nr4:C2E2F2

My questions is. Do you see some major problems with this kind of splitting? I will only add them together mannualy an enter them in to an ledger, so ofcourse I need to trust the ledger, but no other software or hardware.

Antoher question. I have read some places that is it hard to construct x1 and x2 so the checksums of those  seeds are correct, butdoes  that really matter. Will it be sigificant easier to bruteforce in a way, or make some other problems for me.

Thanks for your advises.

Is this the correct way for 2 of 4 if S=x1+x2, x=(A to F)?

Nr1:A1,B1,C1
Nr2:A2,D1,E1
Nr3:B2,D2,F1
nr4:C2,E2,F2