Thanks to the different numbers and letters on each key face as well as the dices' orientations, the resulting arrangement has around 196 bits of entropy, Schechter says, meaning there are 296 different possibilities for how the dice could be positioned. Schechter estimates that's roughly as many possibilities as there are atoms in four or five thousand solar systems. "With modern technology, you can’t really build a computer big enough to guess this number without crushing yourself under its gravity," he says.
After the dice are scanned, the app then offers to use the key it generates to derive an ultra-long, purely random passphrase that can be cut and pasted into a password manager as its master password. The DiceKeys app doesn't store the key it creates from scanning the dice, the master password, or anything else. But crucially, it can regenerate that key and password on command by rescanning the dice box.
Schechter is also building a separate app that will integrate with DiceKeys to allow users to write a DiceKeys-generated key to their U2F two-factor authentication token. Currently the app works only with the open-source SoloKey U2F token, but Schechter hopes to expand it to be compatible with more commonly used U2F tokens before DiceKeys ship out. The same API that allows that integration with his U2F token app will also allow cryptocurrency wallet developers to integrate their wallets with DiceKeys, so that with a compatible wallet app, DiceKeys can generate the cryptographic key that protects your crypto coins too.
The cryptographic hashing scheme DiceKeys uses to generate its passwords and keys prevents anyone, like a rogue password manager or crypto wallet, from working backward to derive the user's underlying DiceKeys key. So DiceKeys is meant to allow th ..
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