Bitcoin Stack Exchange
Bitcoin Stack Exchange

Questions tagged [passphrase]

A passphrase is used alongside a seed phrase to generate a deterministic wallet.

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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 make total 132 bits of entrophy. Is this considered…
shx2
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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 that's generated from a passphrase, and then…
Adam Matan
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19 out of 24 words of BIP39 passphrase (brute-force last 5?)

I have managed to lose 5 words of my 24 word Ledger Nano S recovery phrase. I have words 1-19 but I am missing words 20-24. I have significant holdings on the wallet so would very much like to recover it if possible. The passphrase is a BIP39…
JGoodwin10
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Forgot wallet encryption password, are any brute force tools available?

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 necessary (but if I pre-seed a dictionary with my…
makerofthings7
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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 make sure that the resulting hash is valid, or is…
Noah
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Passphrase works in Bitcoin QT, but does not in Bitcoin Core

I found an usb stick with a wallet.dat. There is also an old notebook with Bitcoin Wallet v.8.6-beta on it. Unfortunately I can't sync it on my old notebook and therefore I am not able to send BTC to another wallet. I then installed Bitcoin Core on…
user70295
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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?
Shamoon
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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 new wallet in multibit and transfer the bitcoin…
user289455
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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 account is done by generating transaction on offline…
CoinsKillTheFed
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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 bruteforce dictionary attack? Assume there are no…
DavyJonesFootLocker
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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 variables be parsed from my bitcoin.conf file?
alfetopito
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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 passphrases which we will eventually forget? I'm…
superuser
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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?
Meni Rosenfeld
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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 idea what it is. Can this passphrase be reset? …
benog
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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 addresses affected when the passphrase is changed? …
Robert Claypool
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