Topic: How to sign a message from a paper wallet without importing your private key? (Read 1385 times)

Quote from: HI-TEC99 on June 09, 2017, 08:05:56 PM

Cryptographic libraries tend to have many lines of code but doing this on air-gapped computer minimises the risk.

Hmm, calculating by hand eh? How do I go about doing that? That's about as safe as you can get!

See here: http://www.righto.com/2014/09/mining-bitcoin-with-pencil-and-paper.html

Calculating cryptographic functions by hand = not practical.

BTCLovingDude

legendary

Activity: 1134

Merit: 1010

BTC to the moon is inevitable...

just a thought/question that i would like to ask here:
is it possible that some of these codes for signing a message create a weak signature leading to leaking your private keys?

i know it is possible when creating a signature for transaction. and although signing a message is similar but it has some differences so i am not sure if it is also possible for that!

Chris!

legendary

Activity: 1382

Merit: 1122

Disclaimer: Don't blame me if it steals your coins, I don't know how reliable the author is.

Ya I wasn't sure if some normal wallet could do this with some fancy maneuvers. I guess not and I don't want to have to trust someone else's coding skills. Thanks for the help though!

Quote from: stefek99 on June 10, 2017, 05:39:43 AM

Here you go: https://github.com/aeternity/wiki/wiki/How-to-sign-a-message-with-a-private-key%3F

I've contributed one of these methods...

Tell me if you need any help.

- Make offline copy of the HTML.
- Copy on USB stick to offline computer
- Run the website offline
- Sign it via HTML / JavaScript
- Put the signature on USB stick / write it down

PROFIT / DONE

Click +1 if it helps you

I'll check it out and see if it requires any trust. Thanks.

There's another offline webpage that can sign messages for you at this link. However any such webpage shouldn't be trusted when online. I wouldn't consider using it unless it was run in an offline isolated environment.

https://brainwalletx.github.io/#sign

That webpage is capable of creating five different message signature types including multibit's and armory's.

Thanks for the links. These are definitely simple for me to use, I'm just going to see if there have been any negative repercussions after someone has used them.

Disclaimer: Don't blame me if it steals your coins, I don't know how reliable the author is.

Ya I wasn't sure if some normal wallet could do this with some fancy maneuvers. I guess not and I don't want to have to trust someone else's coding skills. Thanks for the help though!

Here you go: https://github.com/aeternity/wiki/wiki/How-to-sign-a-message-with-a-private-key%3F

I've contributed one of these methods...

Tell me if you need any help.

- Make offline copy of the HTML.
- Copy on USB stick to offline computer
- Run the website offline
- Sign it via HTML / JavaScript
- Put the signature on USB stick / write it down

PROFIT / DONE

Click +1 if it helps you

I'll check it out and see if it requires any trust. Thanks.

At some point you need to trusts something.

Calculating hash by hand = error prone.

Cryptographic libraries tend to have many lines of code but doing this on air-gapped computer minimises the risk.

Hmm, calculating by hand eh? How do I go about doing that? That's about as safe as you can get!

stefek99

full member

Activity: 233

Merit: 102

https://genesis.re

Disclaimer: Don't blame me if it steals your coins, I don't know how reliable the author is.

Ya I wasn't sure if some normal wallet could do this with some fancy maneuvers. I guess not and I don't want to have to trust someone else's coding skills. Thanks for the help though!

Here you go: https://github.com/aeternity/wiki/wiki/How-to-sign-a-message-with-a-private-key%3F

I've contributed one of these methods...

Tell me if you need any help.

- Make offline copy of the HTML.
- Copy on USB stick to offline computer
- Run the website offline
- Sign it via HTML / JavaScript
- Put the signature on USB stick / write it down

PROFIT / DONE

Click +1 if it helps you

I'll check it out and see if it requires any trust. Thanks.

At some point you need to trusts something.

Calculating hash by hand = error prone.

Cryptographic libraries tend to have many lines of code but doing this on air-gapped computer minimises the risk.

HI-TEC99

legendary

Activity: 2772

Merit: 2846

Disclaimer: Don't blame me if it steals your coins, I don't know how reliable the author is.

Ya I wasn't sure if some normal wallet could do this with some fancy maneuvers. I guess not and I don't want to have to trust someone else's coding skills. Thanks for the help though!

Here you go: https://github.com/aeternity/wiki/wiki/How-to-sign-a-message-with-a-private-key%3F

I've contributed one of these methods...

Tell me if you need any help.

- Make offline copy of the HTML.
- Copy on USB stick to offline computer
- Run the website offline
- Sign it via HTML / JavaScript
- Put the signature on USB stick / write it down

PROFIT / DONE

Click +1 if it helps you

I'll check it out and see if it requires any trust. Thanks.

There's another offline webpage that can sign messages for you at this link. However any such webpage shouldn't be trusted when online. I wouldn't consider using it unless it was run in an offline isolated environment.

https://brainwalletx.github.io/#sign

That webpage is capable of creating five different message signature types including multibit's and armory's.

Chris!

legendary

Activity: 1382

Merit: 1122

Disclaimer: Don't blame me if it steals your coins, I don't know how reliable the author is.

Ya I wasn't sure if some normal wallet could do this with some fancy maneuvers. I guess not and I don't want to have to trust someone else's coding skills. Thanks for the help though!