Tag: security

141 What can an attacker with 51% of hash power do? 2011-09-06T17:45:51.553

129 Is it possible to brute force bitcoin address creation in order to steal money? 2011-08-30T21:26:59.183

114 Why is 6 the number of confirms that is considered secure? 2011-09-20T19:47:46.883

58 What effects would a scalable Quantum Computer have on Bitcoin? 2013-01-08T20:28:49.053

56 Can bitcoins be counterfeited? 2011-08-31T00:33:41.057

56 Have any cryptography experts vetted the bitcoin source code? 2011-09-01T15:05:32.950

56 What keeps the average block time at 10 minutes? 2011-09-10T17:30:48.390

54 What methods could a government use to shutdown Bitcoin? 2011-09-01T14:54:12.563

48 Why was the target block time chosen to be 10 minutes? 2011-11-03T12:21:59.967

44 How can I keep my wallet secure? 2011-08-30T21:30:03.693

43 How long would it take a large computer to crack a private key? 2012-02-04T06:32:55.580

39 How do I accept bitcoin payments at a real world store? 2011-09-01T02:53:32.350

37 What are checkpoints? 2011-10-29T19:41:14.630

35 What is a deterministic wallet? 2011-09-07T21:19:10.987

34 What is a Finney attack? 2012-10-03T09:03:21.703

33 Do mining pools centralize the Bitcoin network and make it less secure? 2011-08-31T18:59:44.053

32 How can I restore my wallet? 2011-09-01T01:50:05.620

29 How can one download the bitcoin client securely? 2011-09-04T22:56:07.527

29 Signing Bitcoin transactions 2013-01-24T10:06:24.967

27 How much would it cost to execute a 51% attack? 2011-09-16T03:15:21.413

26 What is a double spend? 2012-10-05T12:20:32.830

26 How secure is blockchain.info? 2012-11-02T01:20:28.677

25 How can a single person operation keep a collection of online wallets secure? 2011-09-03T17:05:48.737

25 Can one safely buy vanity addresses from a third party without risking one's coins from being stolen? 2012-05-27T19:10:36.687

25 Is each Bitcoin address unique? 2013-03-28T10:34:21.473

22 Can a 51% attack be detected and dealt with? 2011-09-14T19:43:28.123

22 Could the EC2 infrastructure be used to efficiently launch a 51% attack? 2011-09-14T20:59:47.697

21 Are there any fundamental security vulnerabilities in Bitcoin? 2011-09-02T08:36:46.850

21 How does a client decide which is the longest block chain if there is a fork? 2011-09-13T07:33:08.697

21 Gaming the "off-by-one" bug (difficulty re-target based on 2015 instead of 2016 block time span)? 2011-10-13T19:45:54.217

21 51% attack - apparently very easy? refering to CZ's "rollback btc chain" - How to make sure such corruptible scenario can never happen so easily? 2019-05-10T21:51:34.903

20 How can I send Bitcoins via SMS? 2011-09-01T08:35:47.393

19 What protection does Bitcoin have against Denial of Service (DoS) attacks? 2011-09-03T11:31:38.317

19 Was a timejacking attack ever performed? 2012-04-28T19:15:38.640

18 Is Bitcoin future-proof? 2011-08-30T22:16:20.563

18 Are there alternatives for proof of work? 2013-03-20T18:17:43.450

18 What security weaknesses result from using off chain solutions? 2016-05-25T23:45:11.713

17 What can xxxCoin do to stop the impending 51% attack? 2011-09-14T11:00:20.863

17 How does the Bitcoin client encrypt the wallet.dat file? 2011-10-24T10:40:24.250

17 What are the safety guidelines for using the Sign Message feature? 2012-04-01T00:49:19.790

16 What is the safest medium on which to store my wallet/private keys? 2011-12-15T12:12:48.010

16 What is a block withholding attack? 2012-10-03T09:08:25.223

16 Should an end-user download the whole blockchain? Or is a “lightweight” client sufficient? 2012-11-24T21:02:04.177

15 What is the "zeitgeist attack"? Does it affect all blockchain technologies? 2011-09-14T18:17:24.250

15 Are the Thin clients Electrum and Multibit safe and secure? 2013-04-12T15:29:04.193

15 How do you derive the private key from two signatures that share the same k value? 2018-04-08T12:13:12.360

15 What is the origin of insecure 64-bit nonces in signatures in the Bitcoin chain? 2019-01-11T05:23:16.847

14 Does any pool accept higher-fee transactions of a double spend, instead of the earlier one? 2012-05-10T11:45:29.937

14 How safe is a brain wallet? 2013-03-17T23:51:30.823

13 What are the minimum security expectations of an online wallet service? 2011-09-03T12:05:56.007

13 How can I stop websites running an integrated Bitcoin miner without disabling javascript altogether? 2011-10-05T00:45:36.297

13 Which Two-factor authentication methods are available at which exchanges? 2012-07-05T02:01:46.943

13 Should I trust bitaddress.org? 2012-08-13T01:36:53.427

13 Scenario: disaster splits the Internet into dozens unconnected fragments 2013-03-21T04:08:56.240

13 Can the Bitcoin network be used for cracking? 2013-04-07T21:51:24.477

13 Colluding miners attack: Is the Bitcoin protocol compromised? 2013-11-04T16:17:44.070

13 Schnorr's batch validation 2018-11-04T19:55:09.757

13 Is bitcoin.org or bitcoincore.org the one to trust? 2021-01-15T13:21:51.403

12 Do wallet stealing viruses exist? 2011-08-31T01:54:38.247

12 What security features are built in to the standard Bitcoin software? 2011-09-03T20:26:55.067

12 Can I force my wallet to only have news keys, post-encryption? 2011-09-25T15:59:07.173

12 Can someone with 51% computing power earn more than he deserves? 2011-10-11T07:59:58.150

12 What software and skills do I need? 2011-10-18T15:47:49.973

12 What happens to bitcoins if the site shuts down? 2013-10-11T14:46:22.610

12 Why is JSON-RPC over SSL "strongly discouraged"? 2015-08-17T00:04:00.420

12 Who mined the infamous block 364422? 2016-02-06T11:54:21.273

11 What can be done to mitigate the risk of a Finney-attack? 2011-09-21T16:59:28.340

11 How safe is it to use a Linux live CD to access my savings wallet? 2011-12-20T23:28:58.533

11 Is it safe to email an encrypted wallet to myself? 2012-01-20T03:24:34.317

11 DDoS on big mining pools: a quick way to 51%? 2013-04-16T19:55:28.837

11 Is it a 51% attack or a >50% attack? 2013-05-15T06:43:02.747

11 How to download bitaddress.org to use offline? 2014-02-13T10:36:19.630

11 Is there a fallback plan if bitcoin's underlying cryptography is cracked? 2014-11-14T22:00:18.563

11 The length of the Bitcoin's private keys 2016-08-25T07:57:13.457

11 Bitcoin automatically diverted to bech32 address 2019-02-19T09:01:00.203

11 Long term BTC investing 2019-06-19T23:18:10.073

10 How secure are various models of Bitcoin clients? 2012-01-17T01:19:35.730

10 Why would you need to "catch up" in the 51% attack? 2012-02-10T22:02:32.927

10 Which blocks get to be checkpoints? 2012-03-08T14:51:49.913

10 Can a mobile be protected against the "Linode problem"? 2012-04-07T08:15:44.687

10 How does the Electrum wallet encryption work? 2013-01-24T13:37:28.663

10 How vulnerable is bitcoin to quantum algorithms? 2013-04-27T18:41:02.430

10 How can vulnerabilites in bitcoin be responsibly reported? 2013-11-23T17:43:12.133

10 Can I trust the peers I am connected to? 2014-01-24T19:07:14.680

10 What would a new exchange need to be better than the rest? 2014-03-31T07:39:15.483

10 The incident with 92 billion bitcoins 2016-07-06T10:06:22.623

9 Do any of the Bitcoin exchanges implement trading curbs? 2011-09-01T17:49:57.810

9 What prevents bitcoin from breaking down in case of a "transaction attack" 2011-09-09T04:21:58.990

9 Why did BitcoinEXpress plan a 51% attack on Namecoin? 2011-09-14T08:20:35.097

9 String-along, is this possible and is it an attack? 2011-09-16T13:23:54.323

9 How can I best implement Bitcoin in my business? 2011-10-04T10:52:16.660

9 Does the BerkeleyDB-based wallet.dat implementation leak private key data? 2011-12-04T08:52:35.423

9 Does the main Bitcoin client blacklist addresses? 2011-12-08T13:22:18.933

9 How secure is calling bitcoind JSON-RPC? 2012-01-19T21:54:19.787

9 How can I assure my consumers they are actually paying the correct person? (prevent MITM attacks) 2012-09-27T17:01:50.963

9 What happens if my wallet gets "hacked" and my BTC is stolen? 2012-12-12T15:48:01.380

9 Can I create a deterministic wallet and export/disclose indiviual keys without compromising the wallet? 2013-01-10T21:39:28.990

9 Heartbleed bug and Altcoins 2014-04-10T22:07:55.617

9 What is the "1 RETURN" bug? 2015-06-17T09:58:50.980