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2
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1answer
44 views

Can you have a password based cryptocurrency?

Bitcoin is key based. Although it is possible to convert a password into a key, publishing the public key makes it vulnerable to brute force. Currently, passwords are used with Bitcoin, but only to ...
1
vote
0answers
17 views

Storing the intermediate code to generate new encrypted keys

With BIP38 we can also generate an intermediate code (or passphrase code) and give it to untrusted party to generate encrypted key/address but not be able to decrypt the key without the passphrase. ...
1
vote
1answer
38 views

What is the largest password/passphrase size for a wallet.dat file?

Suppose your wallet.dat file is copied to the wild. I am working on methods for creating very strong (512bits, hopefully much more) passphrases that would make it unfeasible to either use rainbow ...
1
vote
1answer
123 views

How can you restore a password in MultiBit if you are given the wallet words BEFORE you even enter a password?

How is it possible to recover a wallet password when the wallet words are provided before you even enter the password? https://multibit.org/en/help/hd0.1/restore-password.html Restore password ...
2
votes
2answers
475 views

Is 12-word seed phrase safe enough?

Is 12-word seed phrase (as used by Electrum for example) safe enough for generating an offline wallet? My understanding is this: 2048 words pool make 11 bits of entrophy per word. 12 words in seed ...
1
vote
0answers
72 views

bitcoin-qt restored wallet.dat all synced closes after correct passphrase “assertion error crypt” HELP

Installed bitcoin-qt and replaced new wallet.dat with old wallet.dat backup Opened bitcoin-qt and let it sync and all blocks synced and wallet has correct funds and past transactions. I Want to ...
-1
votes
1answer
836 views

Hive Wallet recovery without PIN

If I don't have my pin, but I have my 12 word passphrase, how do I recover the wallet without pin?
0
votes
1answer
62 views

Multibit is not accepting the correct password any idea or possible bugs that i could fix

just what i said. Multibit simply isn't accepting the password i used this morning to unlock it. i have tried retyping it about a million times in a million different way. does any one have any ...
5
votes
1answer
130 views

Multibit: Whats the best way to proceed if I have forgotten my password but my wallet is still open

I am running multibit. I have less than half a bitcoin. I realised today that I have totally forgotten my password. My wallet is still open so I can still use it to pay for stuff. Can I create a ...
4
votes
1answer
196 views

Is it possible to have complete cold storage in NXT?

BTC has capability to create new account on offline computer and send some coins to and from that account without ever going online. Sending coins to that account is trivial. Sending from that ...
1
vote
1answer
286 views

What is point of encrypting wallet, if Bitcoin API's sendtoaddress needs passphrase?

The Bitcoin API enables programs on the server to use JSON RPC to interact with the Bitcoin wallet. Most commands do not need the wallet locked (which I assume is the same thing as encrypted). ...
0
votes
2answers
290 views

Are there standardized ways of generating wallets from passphrases?

Brainwallet is a well-known tool that lets you generate an address from a passphrase. I think Brainwallet just performs a single SHA256 hash on the passphrase to get the 256-bit private key of the ...
1
vote
1answer
149 views

Bitcoin QT encryption / passphrase

Installed the Bitcoin QT client only last week... synchronised it with the blockchain... and sent my bitcoins to this adress... Now, when I want to send to some other address, it asks for the ...
1
vote
3answers
2k views

Need help with encrypted wallet.dat. I can't access it with my expected pass-phrase

I created an offline wallet in 7/13 via a Ubuntu live CD. I recently imported the encrypted wallet.dat file into the bitcoin-qt wallet on Windows 7. Coins appeared. But, my expected passphrase is ...
1
vote
1answer
61 views

Potential security problem: wallettpassphrase opens up the wallet for everybody!

I am dabbling with Bitcoin-QT with -server parameter locally, I guess this is not very different from using bitcoind remotely. I use Java and some http client library pluss a json parser to ...
1
vote
0answers
253 views

Bitcoin passphrase fail, restoring backup does not help

Bitcoin passphrase fail steps to reproduce: I installed bitcoin-qt version 0.8.1 around March 22, 2013. I let it sync for about 48 hours until it was completely up to date. No error messages. I set my ...
1
vote
1answer
346 views

What encryption does Electrum use for private keys in wallets?

Electrum can encrypt the private keys in wallets with a user entered password. But what encryption algorithm is used? I'd hope it is reasonably strong crypto. I've looked at the Electrum docs and can'...
2
votes
2answers
721 views

Is there anyway I can recover my passphrase? [duplicate]

I have a wallet for the bitcoin qt wallet but I accidentally deleted the only copy of my encryption passphrase... I have read about something called brute force but I'm not entirely sure on how its ...
2
votes
1answer
143 views

Is the keypool erased when changing wallet password?

In Bitcoin-qt, when a previously unencrypted wallet is encrypted, the keypool is erased and replaced with new keys. Does this also happen when the password of an already encrypted wallet is changed?
1
vote
2answers
3k views

How do I use my Bitcoin-Qt wallet address on Blockchain.info?

My Bitcoin-Qt client is still synchronizing with the network. I'm unsure of how to use my Bitcoin-Qt wallet address on Blockchain.info. I've put my address on Blockchain.info as (watch only), but how ...
3
votes
1answer
394 views

Bitcoin-Qt wallet passphrase help

I do not remember being asked for a passphrase when I installed Bitocoin-Qt (0.8.2 - Beta) (though it was a couple months ago, I could be mistaken) and now am being asked for a passphrase. I have no ...
2
votes
1answer
782 views

Can an old passphrase recover my bitcoins using an old backup wallet.dat file?

I forgot the new passphrase for my wallet. But i previously backed up the wallet with a passphrase i do remember. Can i then access that previously saved wallet and recover my btc ?
2
votes
3answers
568 views

I never encrypted my wallet.

When I installed it I never encrypted it. I then funded the address and I now have 1.1 bitcoins. But when I tried to send or create a new address it asked for a passphrase. I tried every possible ...
1
vote
0answers
48 views

Does bitcoin.conf expand environment variables?

I would like to store my Bitcoin RPC passwords and usernames in environment variables, like: rpcuser=$RPC_USER rpcpassword=$RPC_PASSWORD Is this supported in bitcoin core? Can environmental ...
2
votes
2answers
802 views

What does Bitcoin-Qt “Change Passphrase…” do to existing private keys and corresponding addresses?

"Change Passphrase..." obviously lets me encrypt the wallet with a new string of text. I think (correct me if I'm wrong) that this creates new private key(s) inside wallet.dat. How are existing ...
2
votes
1answer
88 views

Is there any risk associated with using the same passphrase on two different wallets both hosted on blockchain.info?

Does blockchain.info use any salt with the passphrase? I.e., is there any risk associated with using the same passphrase on two different wallets both hosted on blockchain.info? edit: of course ...
3
votes
1answer
1k views

How long would it take to crack an 8-word brain wallet?

Assuming my private key for a bitcoin wallet is derived from SHA256(passphrase) and the passphrase is 8 words long, how long would it take the average attacker to crack my bitcoin wallet through a ...
0
votes
1answer
448 views

Are two factor authentication enabled wallets at mtgox or blockchain.info safe even with weak passwords?

Are two factor authentication (2FA) enabled wallets at mtgox/blockchain.info safe even with weak passwords? What are the risks here, except losing one's mobile phone? A Google authenticator is used ...
0
votes
1answer
1k views

Bitcoin-Qt client: Easy way to using a wallet.dat not in its default location/when it asks for my password at all?

It doesn't have to be called "wallet.dat", right? That would be too obvious. Can you call it anything, with any extension? Bitcoin-Qt is just not so trivial to me to use since the trivial way would ...
3
votes
3answers
385 views

Ideal passphrase length: old diceware method (5 words) vs. your Bitcoin wallet.dat passphrase length (8 words) and doubling passwords?

I made a cool 5 word passphrase back then using the old Diceware method and use it as a master password. The question is: as computing power increases, will we need to add more and more words to our ...
2
votes
1answer
2k views

I lost my Bitcoin wallet passhrase. Are my Bitcoins lost?

After reading about all the hacks I created a passphrase that I cant remember. Are Coins lost forever in the blockchain? There must be a lot of coins in this state… Is there any way to see what ...
2
votes
1answer
2k views

Unlocking wallet, recovering password

I want to send bitcoins, but cannot unlock my wallet. The rpc password located in \AppData\Roaming does not work. How can I unlock my wallet? Deleting the wallet.dat erases all my bitcoins, which I ...
7
votes
1answer
5k views

Forgot wallet encryption password, are any brute force tools available? [duplicate]

I have an idea of what my password should be, but am missing something. Are there any tools or bash scripts to brute force my wallet passwords? If a dictionary is required, I can pre seed it as ...
8
votes
3answers
1k views

Can I use a passphrase as a private key?

Is there a way to use a long (and possibly hashed) passphrase as a private key, so that all I need to recover my Bitcoins would be that password? I was thinking of buying Bitcoins using a private key ...
6
votes
1answer
2k views

Can an SHA256 hash be used as an ECDSA private key?

Is it possible to map a pass-phrase directly to a Bitcoin private key by using its SHA256 hash? I remember reading somewhere that not all 256 bit values are valid ECDSA private keys. If so, how can I ...
4
votes
3answers
4k views

Can I remove the passphrase from my Bitcoin Wallet?

I'm using the standard Mac Bitcoin client and I added a passphrase. I'd like to remove that passphrase. Is that possible?