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Title: How to make an Electrum 2.x seed using only dice? Post by: zowki on May 10, 2015, 04:18:59 PM Is there a method like this except for Electrum 2.x 13 word seeds?
Method for Electrum 1.x 12 word seeds: https://bitcointalk.org/index.php?topic=878614.0 I'm basically looking for a way to make electrum seeds without having to trust a computer. I'm worried that my copy of electrum could be compromised and only generate predictable seeds. Title: Re: How to make an Electrum 2.x seed using only dice? Post by: btchris on May 11, 2015, 01:03:41 PM Here is a way to do this: https://bitcointalk.org/index.php?topic=973997.msg10644190#msg10644190 (https://bitcointalk.org/index.php?topic=973997.msg10644190#msg10644190)
Title: Re: How to make an Electrum 2.x seed using only dice? Post by: zowki on May 11, 2015, 01:12:53 PM Here is a way to do this: https://bitcointalk.org/index.php?topic=973997.msg10644190#msg10644190 (https://bitcointalk.org/index.php?topic=973997.msg10644190#msg10644190) Thanks for the suggestion but that doesn't help if my copy of electrum is compromised. The program might ignore the entropy I provide and make a predictable seed instead. I'm looking for a way like I described in my first post where you don't even need to use a computer to generate the seed (use the physical world only). Title: Re: How to make an Electrum 2.x seed using only dice? Post by: btchris on May 11, 2015, 02:38:15 PM Thanks for the suggestion but that doesn't help if my copy of electrum is compromised. The program might ignore the entropy I provide and make a predictable seed instead. I'm looking for a way like I described in my first post where you don't even need to use a computer to generate the seed (use the physical world only). Got it. You can actually use the same method as in the first post you referenced, with a few small changes. 1. Use at least 13 words (more is OK too). 2. Enter the result into Electrum 2.x to see if the result is valid (via a wallet restore). If it's invalid, the button to continue will be grayed out. 3. Use one of these two methods to modify your seed, and return to step 2 to see if it's valid:
On average, you need to perform step 3 about 130 times before before you end up with a valid Electrum 2.x seed, however it's possible that you could need fewer or many more. For example, there's about a 14% chance you'll need to do step 3 500 or more times.... Also, be sure to take note of my response in that other thread, which remains important for generating an Electrum 2.x seed: Quote you need a deterministic way to decide which die is #1, which is #2, etc. For example, you could roll them each one at a time, or you could use six different colored dice with each color always representing the same die #, or you could just always read the dice from left-most to right-most however they happen to fall (easy to do objectively if you have Travel Yahtzee (http://en.wikipedia.org/wiki/File:Travel_Yahtzee_1986.jpg)). If you don't have some such deterministic method, you will almost certainly introduce bias as you read off the dice in your own personal order. Title: Re: How to make an Electrum 2.x seed using only dice? Post by: Abdussamad on May 11, 2015, 04:46:19 PM I'm basically looking for a way to make electrum seeds without having to trust a computer. I'm worried that my copy of electrum could be compromised and only generate predictable seeds. If your computer is compromised then it doesn't really matter how you generate a seed. Mal-electrum could simply send the seed to the hacker after you've created a wallet with it. I suggest shuffling a deck of cards and then making a string out of the result. Say some thing like 1s-2c-ad for 1 of spades, 2 of clubs, ace of diamonds etc. for the whole deck Then do an md5sum of that and restore your wallet using the resulting hex digits: Code: echo -n "1s-2c-ad..."|md5sum This will create non-bip32 wallet but it can be done on electrum 2.x because it is backward compatible with 1.9.8 wallets. Title: Re: How to make an Electrum 2.x seed using only dice? Post by: ThomasV on May 12, 2015, 11:26:33 AM you can use the make_seed command and pass custom entropy
Code: electrum make_seed --entropy <random number> |