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Questions tagged [security]

This tag should be used for questions regarding security issues with the design or implementation of Bitcoin and related cryptocurrencies.

3
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4answers
339 views

Store Bitcoins offline

I have some bitcoins and ether at Blockchain.info and I am really scared of losing them. How do I best secure them? Right now I have a paper with the code to restore my wallet, but my coins are still ...
0
votes
1answer
64 views

Does a HD Wallet log my IP when i do a transaction?

Companies like BitPay and Electrum, can log my IP when I make a transaction, right? If so, should I use a Web Wallet (plus VPN) for transactions?
1
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2answers
49 views

Why was noise XK fundamental pattern chosen in the transport layer (BOLT 08) of the lightning network

I am currently reviewing the transport layer of the Lightning network protocol. It builds on top of the noise protocol framework handshake patterns. What I don't get: Why was the fundamental pattern ...
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0answers
11 views

Does Bitcoin security rely on the assumption of nearly continuous transactions? [duplicate]

So for an attacker not to overcome good nodes, I believe we rely on the fact that blocks are always being produced, making the attacker essentially outpaced. But in the extreme and ridiculously ...
3
votes
2answers
1k views

Make remote RPC connection to bitcoind server secure

I set up a bitcoind server on an Ubuntu server and I can remotely execute commands on the server. I am doing this with Java/RPC. To execute a command I need to provide a username and password. But I ...
0
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1answer
33 views

Automatically close the bitcoin-qt when enable SSL for RPC

I Just try to enable SSL for bitcoin-qt RPC call. I follow the SSL on RPC link to archive my target. But I am getting the following error and close the bitcoin-qt automatically. I am using the ...
0
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1answer
24 views

How does the Blockchain detect a cheater, who manipulates the blockchain?

Let's assume we have 100 blocks. One miner x has the intention to manipulate block 90. So he has to recalculate the hash for block 90. Following he also has to recalculate the hashes for block 91-100. ...
3
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1answer
34 views

Malicious full nodes causing denial of service attacks

To control >51% of the mining power in bitcoin is impractical due to the immense investment that will be required. Also, The Bitcoin Core client has DoS protection against malicious nodes forwarding a ...
0
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1answer
232 views

Are DAG-based crypto currencies as secure as proof-of-work based blockchains?

A key feature of blockchain based cryptocurrencies is that they provide inherently secure systems that don't rely on third parties. The newer DAG-based cryptos like Byteball are being touted as ...
0
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0answers
14 views

secure Multi-Party Computation (sMPC) in Enigma?

In Enigma whitepaper (>> Link to the Enigma paper <<), in section 5.1 "Overview of secure multi-party computation", page 4, explains how to divide a secret s into multiple shares, using ...
0
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1answer
168 views

Hello, someone is using an bitcoin account to blackmail me [closed]

Someone using a bitcoin account is trying to blackmail me. The account number is 1Mtsd3wXgkJnApaNpqaSSWLC6gCLBBxuaGG. I still have the email they sent me. I can also provide that email if needed, or I ...
0
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1answer
50 views

Private key generation doubt

I read that the private key pk has to be any number between 1 and n, where n is almost 10^77. Since pk' s function is practically to be used as a scalar for multiplying the generator point G, why does ...
0
votes
1answer
28 views

Are transactions with the same ScriptSig a security problem?

For instance while looking at the transaction stack of my address, tracing it to exchanges I use, I came across this: https://www.blockchain.com/btc/tx/...
2
votes
1answer
360 views

Are lightweight LN wallets vulnerable to transaction withholding?

As far as I know, LN requires the user to watch the blockchain in order to perform penalty in time. However, running full node is probably a heavy burden to some users, especially to mobile phones. I ...
8
votes
2answers
21k views

Creating a fake transaction

AttackerAlice has a BTC Wallet with 0 BTC. AccompliceBob has a BTC Wallet. Is it possible to transfer 100 BTC from AttackerAlice to AccompliceBob? Suppose a BadMiner accepted this as a valid ...
0
votes
1answer
15 views

Security of ChaChaPoly (IETF rfc7539) in the noise protocol framework of the Lightning Network

According to this paper ChaChaPoly is secure against chosen known plaintext attacks. I wonder however if that security assumption is weakened by a lot since messages sent on the transport layer of the ...
10
votes
1answer
2k views

Bitcoin automatically diverted to bech32 address

I sent bitcoin to an address starting 3Cn using Electrum but the blockchain viewers seem to show that it has gone to an address beginning bc1 as shown in the link below. Transaction Viewer How can ...
2
votes
1answer
116 views

Byzantine Fault Tolerance Threshold of Bitcoin: 1/2 or 1/3? (Edited)

According to this answer: https://bitcoin.stackexchange.com/a/58908/41513 a Byzantine Fault Tolerant (BFT) consensus threshold is 1/3. On the other hand, there is a common belief that Bitcoin network ...
5
votes
1answer
108 views

Why is the length of the transport messages on the lightning network encrypted?

From BOLT 08 we can see that every message is sent in the following way: 2 byte: length 16 byte: MAC [length] byte: Encrypted message 16 byte: MAC In reality these messages will be send over TCP/...
5
votes
1answer
98 views

Does MuSig have the same security as 2-2 multisig?

Disclaimer: This question is of theoretical importance to me trying to educate myself better on cryptographic principles and signature schemes. I don't intend to imply that in practice schnorr ...
0
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0answers
42 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 ...
0
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2answers
40 views

If a bitcoin wallet service provider terminates a users account, what happens to the funds?

A friend of mine has/had a bitcoin wallet service provided by an online marketplace. Sounds like he had some kind of disagreement with the site administrators and they terminated his account. At that ...
0
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1answer
54 views

Permissioned or Permissionless blockchain? Which one is PoS more adapted for?

Since in proof-of-stake (PoS) there is no mining process, according to functionality of permissioned and permissionless blockchains, which type is PoS more adapted for? In the other words, is a PoS-...
0
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2answers
56 views

How secure is using TOR in Lightning Network?

In following paper (Link to the paper) we read: "combining Tor and Bitcoin creates an attack vector for the deterministic and stealthy man-in-the-middle attacks. A low-resource attacker can ...
5
votes
2answers
590 views

How to perform a double spend attack in websites that accept transactions with 0 confirmations?

To perform a Finney attack or a 51% attack I need to have lots of computational power, but in this case (a website that accepts transactions with 0 confirmations) it seems to me that I only need to ...
12
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5answers
3k views

How safe is a brain wallet?

Edit: The answer is that they are unsafe and have been attacked. Please don't use them! Brain wallets can be created with a (minimum 15 character) pass phrase at https://www.bitaddress.org There are ...
0
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2answers
7k views

Can I modify the source code of Bitcoin to generate addresses people have already used?

Each time you start bitcoin-qt.exe program will generate new random address But what happen if I modify source code and compile new version: instead of new random address I can hard code in source ...
2
votes
1answer
59 views

Does LN require an on-chain “emergency lane” to mitigate systemic risks?

According to LN social slides, a fee market (in other word: "congested mempool", to my understanding) is good. But, there's systemic risks around penalty mechanism, so some sort of on-chain scaling (...
1
vote
1answer
36 views

How could an LN node acquire inbound liquidity? Is there any systemic risk?

I once heard that LN could support dual-funded channels. It doesn't seem so complicated, but currently, I don't know any LN wallet which supports creating dual-funded channels. By the way, I'm also ...
0
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3answers
78 views

Is it smart to just create wallet and then delete it, writing down the address?

What are possible downsides of practice where I download a bitcoin wallet on my phone, write down the seed and the address, purge the app into nonexistence and continue my happy life, sharing my ...
13
votes
2answers
2k views

How do you derive the private key from two signatures that share the same k value?

I wrote my own ECDSA signature algorithm just for the purpose of creating unit tests. With it I created two signatures which went into transaction 56ec7ca7df..., sending from 1GXFXm3es.... These ...
20
votes
3answers
10k views

Is Each Bitcoin Address Unique?

I am wondering whether each bitcoin address is unique. I would assume yes. Then how is this enforced (distributed address generation)? As I understand it each time, an address is generated a new key-...
7
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2answers
2k views

Is a bitcoin address collision possible if generating 90 million addresses every 4 hours?

I am running a test to see if I can obtain a successful bitcoin address collision after generating billions of addresses. I am not entirely sure how I would check them yet. Basically I have an extra ...
7
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2answers
195 views

Can a full node provide a bogus block bloomfilter to a Neutrino node?

When a thin client using BIP157/BIP158 (Neutrino) requests the block filter for the latest block, would it be possible for the full node serving this request to attack the Neutrino node by providing a ...
0
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1answer
77 views

LND Security best practices? Disaster recovery?

Can anyone share a knowledge how to _ secure LND node _ backup node with all Channels I think only a seed will not be sufficient. What is your plan B in case of disaster? How to do an Emergency ...
0
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2answers
47 views

How could a lightweight wallet determine the validity of 0-conf transaction?

I found that a lot of people are interested about security of 0-confirmation payments. But, it seems that most discussions focused on double-spending (like broadcasting two or more conflicting-but-...
13
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1answer
2k views

What is the origin of insecure 64-bit nonces in signatures in the Bitcoin chain?

In Biased Nonce Sense: Lattice Attacks against Weak ECDSA Signatures in Cryptocurrencies Joachim Breitner and Nadia Heninger use a lattice based algorithm to recover private keys from signatures in ...
3
votes
2answers
1k views

I think my bitcoin wallet was hacked. What to do?

I opened bitcoin-qt after not mining for a couple months and found that I suddenly have no more bitcoins! And I see that there were 2 transactions that I did not authorize sending my coins to other ...
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1answer
45 views

Security of Bitcoin Wallet

I have a doubt on Bitcoin wallet. Suppose I have an online Bitcoin wallet. Now, someone breaks into my computer and steals my Bitcoin wallet. Fortunately I have a backup of my wallet on another ...
3
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2answers
354 views

What is it about a Trezor that means it can't be infected by malware?

The Trezor testimonials include that TREZOR ... cannot be infected by malware What is it about a Trezor that means it cannot be infected?
4
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1answer
161 views

Lightning Network: asymmetry in the information tracked by each participant?

In following paper, written by Christian Decker et al., there is a paragraph that is not clear to me. eltoo: A Simple Layer2 Protocol for Bitcoin "The central idea of Lightning is to invalidate ...
1
vote
1answer
46 views

Security implications of removing CHECKSIG in a test

If I conduct an htlc transaction on testnet that does not include OP_CHECKSIG will it still cost an attacker more than (say) $10 in processing power or storage to subvert my tests? Details: I'm ...
2
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1answer
110 views

Lightning network hub security?

Reading the whitepaper, I came across a point: nodes wishing to act as effective intermediaries, 'hubs' or not, need high availability and need to operate autonomously. This means they must have ...
1
vote
1answer
179 views

Who decides what the next, correct Nonce is?

As I understand finding the correct Nonce is the basis when hashing transactions for Proof of Work. How and where is this decided in the ecosystem what the next Nonce is? In my limited understanding ...
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vote
2answers
111 views

Does my Electrum wallet become less secure if I keep generating seeds until I see one I like the look of?

Let's say I want to create a new electrum seed... I didn't like the initial seed words, since I want to remember them and these didn't look too appealing. Looking "too random" for my taste. When I ...
0
votes
1answer
2k views

Private key to mnemonic words, is it safe?

Is it safe to do the following? Suppose I do not want the HD wallet, but I do want the convenience of using mnemonic words to remember the private key. I know I can convert the private key's hex ...
0
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1answer
34 views

How Spectre tolerates spam transactions?

Spectre is a DAG based (directed acyclic graph) distributed ledger (a structure as an alternative to blockchain based distributed ledger). Is there any mechanism in Spectre to prevent sending spam ...
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2answers
27 views

Physical bitcoin vs. Paper wallet?

What is the main difference between a Physical bitcoin and Paper wallet ? And which one is more secure ? And why ?
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2answers
206 views

What are the drawbacks of using a web based wallet and how to overcome that?

Can anyone tell me why many prefer to use application when compared to web based wallets. What are the drawbacks of using a web based wallet and how to overcome that?
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1answer
1k views

Why is increasing block size in the Bitcoin network considered to decrease security?

I have been doing some research on the Bitcoin Cash hard fork and the main contention of increasing the block size appears to be the possibility of less security on the network. How does an increased ...