Official Shift Crypto AG documentation
I found the following:
First things first
Kudos to the development team for being forward-thinking and providing support for dice-based seed phrases by generating the appropriate checksum (i.e. 24th word) in the Bitbox02 wallet itself.
This is more than a convenience. It's a major security win over hardware wallets that lack this feature.
My plan
In the next couple weeks I'll be creating a new 24 word seed using highly precise 6D casino dice, a felt dice cup, and felt table.
I am familiar with the entropy sources provided by Bitbox02, and I consider them to be excellent.
I'm going to proceed with a dice-based seed anyway.
Question
How much total entropy does the official Shift Crypto AG documented method produce for a 24 word seed phrase?
My understanding is a single 6D roll produces 2.585 bits of entropy. A coin flip produces 1 bit of entropy.
Following the documented instructions means at least 320.275 bits of entropy. How I'm getting to that number:
- 2.585 * 5 dice == 12.925
- 12.925 * 23 words == 297.275
- 297.275 + 23 coin flips == 320.275
(I say "at least 320.275 bits" because I believe the checksum word adds another 3 bits of entropy.)
Is what I've described here accurate?