If there becomes trillion wallets in use, do you think finding a wallet with a balance will bitcoin common? For each word in the passphrase, wallet rolls brain the dice are required. The chances are Brain tiny not in your lifetime. Consider this, the wallet cracking your brainwallet doesn't bitcoin have to hit your wallet, hack are happy hack any wallet. How Can I Buy Bitcoin?
How Can I Mine Litecoin? Lets set that aside and assume a script was used to randomly select from , words, and you create an 8 word brainwallet. I've used leveldb for this. Here's one I wrote right now: In the case of the BIP38 wallet the attacker would first have to have your encrypted key, limiting your exposure. Hero Member Offline Activity: Flyskyhigh on February 10, ,
Friday 2 February, Wallet By Binance. Here's brain I wrote right now: Welcome to Reddit, the front page of the internet. There are over bitcoin words in the OED, so if they are chosen randomly it would be difficult to brute force it. Leveldb does not retrieving the the number of entries directly, you have to iterate through the hack database.
So, create truly random wallet. Encrypt the key with BIP Use a decent password and keep the file safe. Choosing something open source with a good community helps ensure it's close to truly random. Also, use something designed for bitcoin like bitaddress. Your security is influenced by the number of possible outcomes that the RNG is designed for, not just the ability to choose something random. If your wallet sits in a safe deposit box and you die, it is easier for your family to recover the funds if the key is not encrypted.
Loss of the pass phrase should be looked at as another point of failure and balanced based on your risks. I think you put humans too low my friend. Computers were created from our own mind and modeled after us. I don't think its that hard to make something that a brute forcer will have a tough jobtime cracking.
I almost want to challenge it because of the mere fact that everyone on here say it can't be done. Oh you think not? Humans have a desire to be connected It is our creation, thus we've instinctively created a tool that gives our lives more interconnectedness or else it would be useless.
It may be what the internet strives for Na, it's easy for a human to make a password that is hard to crack. The problem with brainwallets is that their purpose is to recreate the wallet with just the pass phrase, so you don't have to save a key.
Sit an average internet user down and instruct them to "create a password you can remember that is strong so it can't be cracked. Most users have been trained by the internet that 8 characters, one uppercase, one lowercase, and one number are secure. A decent random number generator uses the system clock, keyboard jitter, and mouse inputs to add entropy to it's numbers Just use 12 random diceware words for a brainwallet, 4 words for a password. Diceware is a method for creating passphrases , passwords , and other cryptographic variables using an ordinary die from a pair of dice as a hardware random number generator.
For each word in the passphrase, five rolls of the dice are required. The numbers from 1 to 6 that come up in the rolls are assembled as a five digit number, e. That number is then used to look up a word in a word list.
In the English list corresponds to munch. A Diceware word list is any list of unique words, preferably ones the user will find easy to spell and to remember. The contents of the word list do not have to be protected or concealed in any way, as the security of a Diceware passphrase is in the number of words selected, and the number of words each selected word could be taken from.
Passphrase Random password generator Password strength. Parent commenter can toggle NSFW or delete. Will also delete on comment score of -1 or less.
Also, if you're going to use a brain wallet, don't use just one round of SHA as the algorithm, because that's what all the people such as OP are searching.
Run SHA in a loop several times, or mix and match different hashing algorithms. For example, you could run SHA the same number of times as your birth year. That would be easy to remember but make searching the key space many orders of magnitude more difficult.
The disadvantage with that approach is that you additonally need to remember the number of SHA rounds, and an app that supports this calculation. I'd say bip38 is the way to go, and brainwallets should be abolished. That's why I suggested using your birth year, you are unlikely to forget that And I wouldn't say you need an app, exactly, a simple shell script will do.
Here's one I wrote right now:. BTW, I'm not necessarily suggesting that people should use brain wallets, but if you do, then 1 round of SHA is a really lousy choice of algorithm Why I don't use brain wallets I made up. If you enter a random character password, there's no way they would have that in their database. The biggest mistake BrainWallet creators have made is to not let the password through something like , rounds of hashing.
That would make this hack practically impossible. Nothing wrong with brain wallets as long as your passphrase isn't weak and easy to brute force. Granted, if someone uses a weak character passphrase, he can expect to lose his money. Because they're helpful when dealing with large numbers.. Spacing and commas make the difference between and very clear. Don't choose a password for a brainwallet.
The only safe way is to have a machine or a dice to generate it randomly. However the matter at hand are brainwallets. And 12 random words are easier to memorize than a string of random characters. The solution I use is to use very complex pass phrases generated by a trusted open source tool, but then I trust everything to keepass.
I call it brainwallet because I remember the 12 words. The origin of the words is random but the purpose is the same. That's a good question, I have no idea how many passwords I have. I downloaded a few password lists that I could find, piped them through hashcat to create modifications of them, and then into database. Leveldb does not retrieving the the number of entries directly, you have to iterate through the whole database.
I'm doing that right now and will reply again when I have the number! Ok so I have exactly The database is Each password actually consists of 2 entries for compressed and uncompressed form, so each entry uses 40,73 bytes.
Each entry contains a 20byte RIPEMD hash and the password itself, so it looks like the leveldb database is a pretty efficient data storage. That is not at all random. Switch to BIP38 instead. Can you explain this paragraph in more detail? Each entry is duplicated for the compressed and uncompressed version of point conversion". A public key is 2 coordinates in a curve. If you know one of the coordinates you can extract the other. Public keys with only one coordinate is called "compressed".
So for each private key you can have two versions of the public key, which hash into two different bitcoin addresses.
Exactly what PikoStarsider says. An uncompressed key needs two large numbers, the x and y coordinate of point. Since there are only two possible points for any given x on the elliptic curve, when you store the compressed form you just have to store the x coordinate and an which of the two points you mean.
Private keys cant get common at all. I just hacked this Adress in a second: Yes this has happened before. Bitcoin is not a bubble, it's the pin! My ignore list here: Full Member Offline Activity: Flyskyhigh on February 09, , They have done the calculations and always shows it is more Profitable to mine BTC with the hashpower than attempt to crack a wallet. Even generating new wallets hoping to find Bitcoins is less likely than mining a block.
The chances are Ridiculous tiny not in your lifetime. AGD on February 09, , Hero Member Offline Activity: No, that isn't something to worry about, bruteforcing a key is not a real thing, you can attempt it all you want but it just won't give any results, it is just too much of variable. Brainwallets, now that is a different subject. February 09, , Don't take any information given on this forum on face value.
8 Jul But that's the point, says Dan Kaminsky, the founder of the White Ops security firm that employs Castellucci and a well-known security researcher with an interest in bitcoin. Brainflayer is designed to level the playing field and prove to anyone that their insecure brain wallet can be hacked. "Ryan is not the. I present to you the result of a little weekend project of my attempt to hack brainwallet passwords. Please note that I didn't steal anybodies. 17 Feb A group of researchers discovered that roughly 1, brain wallets have been drained by cyber criminals that have stolen $, The term brainwallet refers to the concept of storing Bitcoins in one's own mind by memorization of a passphrase. The phrase is converted into a bit private key with a.