Questions tagged [encryption]

For questions relating to encryption operations and algorithms as they apply to crypto-currencies specifically.

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1answer
484 views

Does Bitcoin wallet encryption also protect my sending and receiving addresses?

Bitcoin wallet encryption makes sure (by encrypting the private keys with a passphrase) that someone who finds your computer or your Dropbox or your backup drive (including wallet.dat) cannot spend ...
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1answer
553 views

How do we have one-to-one mapping given the key size differences?

If public keys are 34 characters long, and private keys are 61 characters long, then the combinations of 34 characters is not sufficient to give each combination of 61 characters a unique pair. My ...
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3answers
172 views

Securely encrypting a cold storage wallet

I'm going to buy bitcoin to exchange BRL to CAD currency, as it's gonna be a great amount I'm concerned about the security of my wallet. I don't want to use a physical backup like paper or device ...
3
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1answer
111 views

Has Bitcoin Cores encryption wallet security ever been bypassable?

Every few years there seems to be an exploit found in Trezor that allows people to bypass the security. I was wondering has there every been the same case for Bitcoin Core wallet encryption?
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1answer
561 views

Check if wallet is encrypted or not through RPC API

How can one check if their wallet is encrypted through the RPC API without receiving an exception? I went through the Original Bitcoin client API calls list but didn't find any command that could ...
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5answers
916 views

Encrypting wallet manually instead of using hardware wallet

i am new to this community and like to know why one should prefer a hardware wallet instead of using encryption algorithm like AES-256 along with PKDF2 to secure crypto wallets ? i currently hold btc ...
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1answer
133 views

Bitcoin and encryption

To the best of my understanding Bitcoin uses encryption to create the digital signature, basically, by encrypting the hashed message (transaction?). Would like to get your expert opinion to my claim ...
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2answers
238 views

Is it possible to definitely lose bitcoins? [duplicate]

The maximum number of Bitcoin is 21 000 000. However this number of Bitcoin may never exist. Supposing someone have 5 BTC in their wallet. In order to protect them, they encrypted it and then forgot ...
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2answers
2k views

How does the Bitcoin Standard Client wallet encryption work?

I encrypted my wallet using Bitcoin QT, then closed the application. When I restarted Bitcoin QT, it did not ask for the passphrase. But I could still access the wallet. How is it possible to access ...
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2answers
249 views

Does FIPS 140-2 crypto certification matter for Bitcoin?

I'm implementing part of the Bitcoin client in C# and noticed that I have the choice between FIPS 140-2 and non certified versions of SHA256. Supposedly both versions give the same hash. Does the ...
2
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1answer
41 views

Ledger 8 pin number how hard in terms of entropy is it to guess?

ledger has a max. 8 number pin for unlocking it as far I know. I am very interested, can someone say if (given any method/resources) it is in any scenario (except luck) possible to guess this 8 ...
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1answer
60 views

Why doesn't the Bitcoin-qt client ask for the Wallet passphrase upon startup?

I've just encrypted my wallet.dat file using the "Settings -> Encrypt Wallet" menu option. I then closed the client and re-opened it. I was expecting to be prompted to put in the wallet password ...
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2answers
66 views

Conditional based Crypto based on Smart Contracts

Is it possible to store an encrypted message in the blockchain that reveals itself only when a particular condition is met? I think that the conditional disclosure can be done with Smart Contracts, ...
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3answers
393 views

Could someone solve for your private keys by sending many transactions to the same address?

I've read that it's never safe to use the same bitcoin address more than once because there is a small chance that someone could solve for your private keys (though I don't have a solid-enough ...
2
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1answer
520 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 ...
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2answers
476 views

Is it possible for computing power to increase quick enough to break mining retargeting?

So from what I understand, mining bitcoins basically becomes more difficult as more bitcoins are mined. This is done so computing power doesn't get so strong that bitcoin mining becomes trivial to ...
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1answer
2k views

Is there any open source implementation of Bitcoin wallet encryption in Java?

I intend to establish an efficient and secure scheme for protection of wallets. For this , I need source code that implements wallet ecryption as mentioned in https://en.bitcoin.it/wiki/...
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1answer
270 views

How secure is Secure Print?

Armory gives the option of Secure Print for making paper backups. I understand that the developers give this option in case your printer stores a cache, or if the wallet could otherwise be compromised ...
2
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1answer
178 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?
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1answer
258 views

What happens when i change the encryption password of Bitcoin-Core wallet

What happens when i change the encryption password of Bitcoin-Core wallet? Is first pass lost forever , where is it saved - on the blockchain or on the wallet.dat file? What if encrypt wallet with ...
2
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1answer
77 views

C-lightning Implementation password protect hsm while maintaing node access

I was wondering if there was a way to encrypt the folder that contains the hsm_secret (and a lot of other operational files necessary for constant operation of a C-lightning node) without cutting it ...
2
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1answer
111 views

I have a 100 character text message and I want to encrypt this message with my bitcoin “PUBLIC KEY” and decrypt it with my private key in Javascript

Are there any javascript libraries that can encrypt a 100 character text message using your bitcoin public key, but only be able to decrypt it with your bitcoin private key? I'm looking to create a ...
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2answers
68 views

How can I use messengers for crypto transactions?

Is it possible to use Signal or Telegram for crypto transactions? I heard CryptoCat messenger is for such needs, but interested in using those two mentioned above.
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2answers
560 views

Using Bitcoin Core Wallet, encrypted it, now it won't recognize password

I typed in the password very carefully, the same 5 digit password I use on another program. I know and remember exactly what I typed, I didn't type anything incorrectly. I got an error message saying ...
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1answer
371 views

ECIES - When is it bad to sign and encrypt using the same keys?

Suppose I have a public key for a particular user (perhaps extracted when using the new public key recovery format included in P2SH, and BIP32 transactions). Is it OK the same key for both signing ...
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2answers
1k 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 ...
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3answers
869 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 ...
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0answers
159 views

Safety differences between full wallet encryption and only encrypting the private keys?

I'm a newcomer in the Bitcoin world and I wanted to ask the following questions regarding wallet security: What are the safety differences between fully encrypting the wallet.dat file and only ...
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0answers
69 views

Does Amit Sahai's indistinguishability obfuscator enable Autonomous Virtual Corporations or “Agents”?

Given that an "Agent" is described as Agents are autonomous programs that maintain their own wallet, which they use to buy server time. Money is obtained by the agent selling services. If demand ...
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0answers
249 views

Is there a way to import a private key already protected with the passphrase?

Let's say I have a hot wallet that has passphrase encryption enabled. Then let's say a large withdrawal needs to occur but the hot wallet has insufficient funds and a transfer from cold storage is ...
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2answers
184 views

why is the blockchain necessary if bitcoins utilize cryptography

Mainly I am proposing the idea below because I feel that the blockchain is overkill, but I assume I must be missing something. So if someone could pick out the flaw below, I would greatly appreciate ...
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3answers
75 views

Ironically, encryption is not an important part of bitcoin (?)

The above statement is taken out of a book which I've been reading: Mastering Bitcoin 2nd Edition. ...as its communications and transaction data are not encrypted and do not need to be encrypted ...
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3answers
377 views

Where can I go to read up on encryption methods used in Bitcoin?

Where can I go to read up on encryption methods used in Bitcoin? I am particularly interested in the idea that I can use a private key to sign something and it proves to the world I have the private ...
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2answers
900 views

API Authentication via Python

I'm having trouble following LakeBTC's API instructions for connecting to their API via Python. API Documentation: https://www.lakebtc.com/s/api I have my key (email address) and secret. I'm using ...
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1answer
932 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'...
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2answers
1k views

How are transactions secured?

I'm a programmer and want to get to know more about encryption and how Bitcoin works, but there is not much on the web describing how all this code works. It would help if there was some visual way to ...
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1answer
1k views

Storing an encrypted private key on a server

I am planning on building a small e-wallet website to learn the basics of encryption and handling accounts, transactions, and balances in Bitcoin. I want to learn how to make a website where the ...
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1answer
61 views

Is blockchain really secure to store sensitive data?

Plenty of developers these days trying to decentralise everything. I noticed some developers claim that they are gonna replace email with blockchain technology. johnmcafeeswiftmail, CryptaMail, ...
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2answers
91 views

Will there be a point in the future where moving bitcoins to a new address will make them safer?

OP_SCHNORRCHECKSIG: Exploring Schnorr Signatures as an Alternative to ECDSA for Bitcoin I've noticed (e.g., the above article) that newer forms of encryption are being researched and developed for ...
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1answer
108 views

Derive symmetric keys

Is there some means by which I could derive symmetric keys using bitcoin public keys or HD Wallet public key which I have shared with a second user.
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1answer
674 views

Decrypt my private key using KeyCrypter

I am trying to decrypt my private key bytes using the KeyCrypter interface. But i do not know how to implement and call the decrypt() function. Initially i encrypt the bytes of my Private Key of my ...
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1answer
173 views

Authentication and key distribution in bitcoin

After going through the bitcoin protocol documentation it is still unclear to me how the bitcoin client is authenticated. Where can I find an overview of what the client sends and receives on the wire ...
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1answer
320 views

Encrypting Bitcoin private keys instead of printing out paper

I follow the procedure of making a cold storage wallet: downloaded copy of bitaddress.org using an off-line computer booted with Ubuntu from CD. Instead of printing out the private keys and ...
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2answers
361 views

Can you encrypt not just the private key, but also the public keys (ie bitcoin addresses) in an Armory wallet?

I would imagine that the paranoid darknety bitcoin user has an interest in keeping not only their private keys safe (so nobody can steal their bitcoins), but also has an interest in keeping their ...
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1answer
115 views

Why do you need to send a transaction out with NXT to secure your address?

When setting up an NXT account, it is recommended to send a transaction out in order to secure your account. I don't quite understand why it's needed. I know that if you don't send one out, your ...
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1answer
548 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). ...
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1answer
4k views

Restore encrypted wallet

I need to restore a wallet created with bitcoin-qt which was encrypted. I have the encrypted wallet.dat file only. Do I restore this simply by replacing the current wallet.dat with my backup wallet....
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1answer
350 views

How is wallet at official client encrypted? What encryption it use?

How is wallet at official client encrypted? What encryption it use? What encryption does Bitcoin-qt use and what encryption is used at Multibit? And how strong that encryption is compared to other ...
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1answer
451 views

In the sourcecode, what does this line mean that recovers the key from the signature?

I understand that the public key (Q) can be extracted from a signature (r,s), but I'm having trouble understanding this line: if (!key.Recover(hash, &vchSig[1], (vchSig[0] - 27) & ~4)) The ...
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1answer
36 views

How is the PRIVATE KEY actually created in the first place?

How is the "Private Key" created in the first place? I understand that once you have your wallet, you will also gain access to your public key and private key... But in order to have a wallet ...