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Questions tagged [encryption]

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

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104 views

Encrypted message with nLockTime

I know you can delay a transaction's accepted date by using nLockTime. I'm still looking for the simplest way to generate a transaction with nLockTime, but that's another topic. I'm wondering if ...
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88 views

Is the Password stored in RAM in clear text after decrypting the MultiBit HD wallet?

After decrypting your wallet in MultiBit HD, is the clear text version of password stored in the RAM?
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71 views

Can't start bitcoind after wallet encryption (Bitcoin Core)

pretty new to the Bitcoin world! I downloaded Bitcoin Core and got everything up and running. I then attempted to encrypt my wallet, and after successful encryption can no longer start bitcoind. ...
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87 views

Is there any implementation of attribute-based encryption on top of Bitcoin?

I've found a few papers detailing how you could do it in theory, but haven't seen anything in practice. Like a system for distributing bitcoin to private keys, where those keys are only distributed ...
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155 views

How MultiBit stores password

I'm curious to understand how MultiBit stores my password. The fact is: I can restore the password by using the 12 words. From this answer it seems tha the AES key to encrypt the password is derived ...
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0answers
73 views

Java bitcoinj: semantics of 'decompress' on encrypted key

Calling the decompress method on an encrypted ECKey object yields an ECKey object which has no private key (only public). I personally would have expected to get the same encrypted key in uncompressed ...
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171 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 ...
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94 views

Implementing Secret Sharing with an Encrypted Bitcoin Wallet

How would I implement Shamir's Secret Sharing Scheme with an encrypted Bitcoin wallet?
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889 views

How do I get my encrypted private key converted?

"addr": "typicalbitcoinaddress", "compressed": true, "encrypted_privkey": "this is my private key that is 96 characters long", "label": "Wallet", "pubkey": ...
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41 views

data confidentiality on blockchain

How does blockchain promise data confidentiality when the data is not encrypted? Or data confidentiality is not part of blockchain feature?
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200 views

Is encryption really needed for blockchain to work?

Is it right to say that Bitcoin and other blockchains do not use encryption? I read somewhere that blockchains rely on digital signatures and hash functions but not on encryption, and that encryption ...
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2answers
216 views

How does blockchain technology handle the actual transaction data?

My understanding of how a transaction is secured in blockchain, especially in bitcoin, is that the output of transaction data is locked to the recipient's address (a shorter version of his public key)....
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1answer
394 views

one time pad using blockchain

I am thinking if secure encryption like one time pad (OTP) is achievable using bitcoin blockchain? The reason is bitcoin blockchain size is over 70 GB, which could potentially encrypt/decrypt 70 GB ...
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2k views

Generating Public & Private key pairs for cracking Bitcoin [duplicate]

Would one of the better methods to crack Bitcoin be to start creating a massive database of key pairs? It would then be possible to reference the Private key required off the public key from the DB.
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1answer
37 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
151 views

How can you sign a transaction without that signature being forged in the future?

So thinking here about an offline transaction. Both myself and the receiver sign it, and then at a later time that transaction is broadcast to the network in the block. What is stopping me from ...
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2answers
77 views

Nosey/disgruntled employees at my VPS company

How can I take steps to prevent/detect bad employees stealing my money? I'm running bitcoind on a VPS with Ubuntu 14.04. Only ports open are 22, 80 and 443. I have fail2ban and auditd enabled. ...
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1answer
24 views

Is it possible to run HD derivation with an encrypted master node or seed?

Given either a seed or the private part of a master node, that is encrypted using AES-256-CBC (or another secured symmetrical cypher) with key K, is it possible to run derivation such as described in ...
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1answer
159 views

Is the Mycelium HD wallet private key stored encrypted on the device?

haven't found details on that in the net. My concern is that I'm using a corporate (bring you own device) phone. We have to install a "security" app running with administrator rights. IMHO this app ...
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1answer
79 views

Could BitCoin network be destroyed if blockchain would get corrupted?

This thought came to me whilst watching mr. Robot where the entire database of a financial corporation has been encrypted. Would that (in theory) be possible if a virus was spread that would target ...
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1answer
76 views

Solving a Block with more than one miner connected to same daemon

Well excuse me in advance if my question sounds funny. But I'm just curious perhaps someone can shed a light. When in a pool of miners, let's say there are 100 miners connected to a single daemon ...
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1answer
53 views

How are transactions verified by nodes other than the initial receiver?

If I understand correctly, when I create a new transaction from my wallet, I have to sign it and encrypt it. My wallet encrypts the message using the public key of the node it is connected to, so it ...
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1answer
125 views

Changing wallet password using double quotation marks turn out to be mysterious (Qtum Core)

I installed Qtum core in my Ubuntu 16.04 server and generated my wallet, and encrypted it. For the test purpose, I changed the password using the command like below. I typed below command to change ...
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1answer
395 views

Two identical transactions and hashes in Block Hashing algorithm

As I was reading Bitcoin hashing algorithm, I see that a Block Header contains hashes in the form of fields like hashPrevBlock , hashMerkleRoot . I have following questions: 1) Are the transactions ...
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2answers
429 views

BitcoinJ encrypt message

I came across this in the source code for ECKey.java: "Represents an elliptic curve public and (optionally) private key, usable for digital signatures but not encryption." Why can you not encrypt ...
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1answer
46 views

Bitcoin Signatures are susceptible to quantum attacks - how exactly and with what practical impact? [duplicate]

@PieterWuille wrote in another thread: "" The hashing algorithm is probably the most quantum-resistant piece of cryptography right now in Bitcoin. Barring any specific breaks, SHA256 and RIPEMD160 ...
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43 views

How may bitcoins hash algorithm be secured in the future from quantum computing brute forcing?

Other threads already answer very clearly that quantum comps could easily "break" /attack bitcoins chain. Now: Are there any ideas among the bitcoin devs circulating out there, how to save bitcoin ...
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18 views

Does a Standardized Shamir Sharing protocol exist?

I've read Satoshi Labs SLIP 0039 github.com/satoshilabs/slips/blob/master/slip-0039.md But I can't find an implementation of this SLIP. Ian Colemans' tool(https://iancoleman.io/shamir/ is very easy ...
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1answer
52 views

can I Re- encryp my wallet with a wallet.dat file from before encryption

My computer crashed and I lost access to my bitcoin wallet.. before that happened I knew I had lost my passphrase so when trying to recover my wallet with my wallet.dat I looked for a very early dated ...
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2answers
3k views

Seed for bitcoin-core qt

I have a bitcoin core -qt Wallet (on linux). Tell me, can I encrypt it? For example, there is the electrum wallet! It has words for deciphering. For example, i installed the electrum and the phrase ...
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1answer
143 views

Unconfirmed bitcoin transaction (Need help) [duplicate]

I have sent bitcoin since 25th May 2017 till now the transaction haven't confirmed yet. https://blockchain.info/tx/ac0635c98af0703927f1b364d2d8c19f4b2812c97169c729cb341111adcea866 How can i do? Please ...
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44 views

At what market cap will bitcoin be worth “cracking”?

This is the doomsday scenario: bitcoin's market cap goes into the trillions of dollars and the cost/benefit ratio of cracking the encryption algorithm tips so that it becomes attractive to throw ...
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300 views

How can an encrypted wallet spend coins without asking for decryption password?

It is possible for some encrypted wallet to spend coins (e.g. this one) without requesting a decryption password or any other form a authentication. Of course, a password is requested when first ...
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How to set Dogecoin Wallet Encryption? [duplicate]

Should I make a Dogecoin wallet addresses encryption? If yes, what are the pros and cons and how it is made on linux - Ubuntu 13.10?
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342 views

How can I access my private keys? Will the key get lock further if I enter the incorrect password too many times?

I exported my private keys and Multibit unencrypted but when I try to import the key files I am being asked for a password... copying the the key from text edit and pasting it into blockchain results ...
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2answers
149 views

Practical application of Electrum's Encrypt/Decrypt message feature?

It's pretty clear how signing a message with a Bitcoin key can be useful in proving ownership of funds. However, it's far from clear how encrypting a message with a Bitcoin key can do anything useful....