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Author Topic: Passhprase strength  (Read 353 times)
Pmalek
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October 11, 2019, 08:49:57 AM
 #21

This is something that I often think about. On one hand, obviously keeping your involvement with bitcoin private is good for you own personal security, but on the other hand, I want to be able to spend bitcoin in person, and I not infrequently talk to local merchants, vendors, tradesmen, etc., about accepting bitcoin
Nothing wrong with that. Dealing with merchants, tradesmen and other bitcoin enthusiasts is good as long as you keep it inside the 'Bitcoin family'. That is why I asked in my previous post what kind of people know that OP owns Bitcoin and what exactly do they know about him. People you trade with, buy or sell to are OK but I would not brag about owning Bitcoin in the public and how safe my hardware wallet is.

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October 12, 2019, 02:21:29 PM
 #22

Dealing with merchants, tradesmen and other bitcoin enthusiasts is good as long as you keep it inside the 'Bitcoin family'.
That's kind of my point. If we only talk about bitcoin to other people who already use bitcoin, then how is it going to grow? Long term growth of bitcoin (including sustainable price growth as opposed to speculation driven fluctuations) depends on adoption. Adoption will only increase with people who don't use bitcoin starting to use bitcoin. Merchants won't go to the effort of starting to accepting bitcoin unless they know there is a demand for it. If nobody ever talks to merchants/vendors/retailers/tradesmen/whoever about bitcoin, then they won't know there is a demand, they won't ever start accepting it, and adoption will never come.

The future of bitcoin depends on people being vocal about bitcoin and its use, particularly to people outside the "bitcoin family". I'm just not sure the best way to balance that with your own safety.

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October 12, 2019, 04:07:32 PM
 #23

Would 6 names of family members would be secure enough? Because I prefer my passphrase to be memorized.

On the pure basis of password strength against brute force attacks and using the 6 of the most common male names from the UK: OliverJacobNoahJackOscarHarry

It would take the following amount of time to brute force using am average computer: 46 NONILLION YEARS / 6130 CENTURIES

Without capitalizing the first letter of each name, it's still pretty good: 86 SEXTILLION YEARS / 10000+CENTURIES

Sources: 1, 2

Looks fine, as long as nobody knows who are right now  Wink

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October 12, 2019, 06:53:48 PM
 #24

If we only talk about bitcoin to other people who already use bitcoin, then how is it going to grow?
I understand what you are saying and it makes sense. But I would like to make a difference between talking about the technology, use cases, adoption or teaching people about Bitcoin, and talking about the new car you just bought with Bitcoins and the new house you are planning to purchase next month thanks to bitcoin. People can know that you have some, that you use it from time to time but not how good you are doing because of it. 

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October 12, 2019, 07:04:27 PM
 #25

HI guys

I am seeing too many horror posts regarding BTC being stolen so I am going to protect my coins by a passphrase.
Would 6 names of family members would be secure enough? Because I prefer my passphrase to be memorized.
I realize that 6 names of family members isn't as secure as completely random words but not having to write anything down or store anything has many security benefits too.
My keys are safely stored offline already.

Would 6 random names be safe enough as passhprase against brute force attacks if my private key is known?

Many thanks!



The resistance of password to brute force attack depends solely on its length. Repeat your all  six random names  5 - 10 times in row and it will become unbreakable.

 
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October 12, 2019, 07:15:51 PM
 #26

Repeat your all  six random names  5 - 10 times in row and it will become unbreakable.
There is probably a maximum character length that has to be respected so that will not work. Someone mentioned that the passphrase can have up to 35 characters in a previous post if I remember correctly.

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October 12, 2019, 09:16:10 PM
Merited by Pmalek (1)
 #27

talking about the new car you just bought with Bitcoins and the new house you are planning to purchase next month thanks to bitcoin.
Sure, I take your point. It's generally a good idea to not brag about your wealth regardless of what form of money or other assets it is in.

The resistance of password to brute force attack depends solely on its length. Repeat your all  six random names  5 - 10 times in row and it will become unbreakable.
6 names (~40 characters) is already going to be unbreakable from a brute force point of view. The concern is not from brute forcing but from dictionary or other word list attacks.

Someone mentioned that the passphrase can have up to 35 characters in a previous post if I remember correctly.
You can see my post earlier, but your passphrase can be as long as you want. There is a limit to what a Ledger or Trezor will accept, but not most software wallets.

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November 01, 2019, 04:30:52 AM
 #28

hi
hi
hi
HI
HI
Honestly, the thread contains some interesting information that I would prefer to read and learn but inside the thread, OP made so many "Hi" posts (edited ones), that should be avoided and deleted.

OP should go in further detailed explanation on his/ her need and ask for further help/ clarifications from knowledgeable users if need more supports.




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November 01, 2019, 06:57:48 PM
 #29

hi
hi
hi
HI
HI
Honestly, the thread contains some interesting information that I would prefer to read and learn but inside the thread, OP made so many "Hi" posts (edited ones), that should be avoided and deleted.

OP should go in further detailed explanation on his/ her need and ask for further help/ clarifications from knowledgeable users if need more supports.

OP must have his own reason to edit the post (most likely serious privacy concern) and it's understandable.

But almost all of his posts are quoted by other members, so you should able to get important part of the information.

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November 02, 2019, 09:00:42 AM
 #30

I did indeed remove some of my own posts for privacy reasons, but you can still see most of it in quotes Smiley
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November 02, 2019, 07:44:55 PM
Last edit: November 02, 2019, 07:56:05 PM by Dabs
 #31

I'm a bit late since you've edited everything out. It's not difficult to use diceware to generate an additional 4 to 8 words and then memorize those words in order, as opposed to using names of your family.

Here are a few I found online, if you really don't want to use physical dice:

https://www.rempe.us/diceware/ = says here 8 words will take 15x the age of the universe to crack
https://diceware.dmuth.org/ = has a fun dice animation

There's a few more you can find if you do a search.

But dice are cheap. 100 six sided dice are less than $20 shipped. Even so called Casino Grade dice are less than $25 for a stick of 5. I might get some casino dice to play with.

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