Secure print backup questions

[tardy]

Hi,

I am making a Single Sheet SecurePrint backups for my Armory cold wallets.
One on TerraSlate paper using a public printing store, as I don't have a laser printer.
Another backup method I have is a PDF I store on a private s3 bucket, for the redundant storage.

The Root Key is kept completely separately.
If somehow this printed copy or bucket gets compromised is it feasible to brute force to get the Root Key?


Thanks for your help
 

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[nc50lc]

The Root Key is kept completely separately.

Do you mean, just these parts of the single-sheet backup?:

Test Wallet

If so, then it's a useless backup, it contains nothing but the wallet ID and info in case you need to manually find it from your computer.

[tardy]

The Root Key is kept completely separately.

Do you mean, just these parts of the single-sheet backup?:
https://i.imgur.com/1kma1YZ.png
Test Wallet

thanks for answering my question

I just realized I used the term "Root Key" incorrectly previously.
For clarity the root key is shown, just using the secure print feature so that it is encoded.
I keep the code separately when printing or storing online (in private folder)

I meant the sheet itself, but using the secure print feature where the root key appears to be encrypted by a code.
Example below.
https://thankyousatoshi.s3.amazonaws.com/Armory+wallet+example.png

my question essentially boils down to, is it safe to print the secure print version of the backup at a printing shop?

[nc50lc]

I just realized I used the term "Root Key" incorrectly previously.
For clarity the root key is shown, just using the secure print feature so that it is encoded.
I keep the code separately when printing or storing online (in private folder)

Ah so the one stored in s3 bucket and the one being sent to a printing store didn't contain the "encryption code".
That would slow-down anyone who took a glimpse on your encrypted root key, but not totally impossible to bruteforce.

You might want to read this old topic regarding Armory's "Secure-print" feature:
https://bitcoin.stackexchange.com/questions/25694/how-secure-is-secure-print
Note: That was from 2014.

[tardy]

That would slow-down anyone who took a glimpse on your encrypted root key, but not totally impossible to bruteforce.

Thanks for your patience and providing that link.

I think I feel confident printing the backup in public, but still may buy a $100 laser printer just in case.

I think I'll encrypt the PDF that is on s3 with something like veracrypt.
https://www.veracrypt.fr/en/Home.html

Thanks for your help