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3
votes
1answer
46 views

What are some of the pitfalls of a 100% proof of stake currency (pos) like NXT?

Bitcoin has the vulnerability of a 51% attack for a proof of work currency, but what pitfalls does a 100% proof of stake (pos) currency have like NXTcoin?
1
vote
1answer
64 views

How likely are key pair collision attacks? [duplicate]

Is it possible to be profitable by developing a collision application that continually and automatically generate a key pair, check for the existence of the public address in the block chain, and then ...
1
vote
2answers
245 views

Is the denumerability of private keys a threat?

Since the set of all private keys is denumerable, it is at least possible to create a searcheable record of all keypairs. Which, when finished, is a killer for the whole idea. Am I right or do I miss ...
2
votes
2answers
153 views

What other currencies have same malleability vulnerability as Bitcoin? [closed]

Malleability of Bitcoin protocol has contributed to major losses and represents uncomfortable risk to Bitcoin investors in addition to possibility of 51% attack that depends on promise of biggest ...
0
votes
0answers
108 views

Is there any statistical analysis of the security of a “Brain Wallet”?

Assume that a transaction is paid to a brain wallet address. (not P2SH, or M of N) Is there any statistical approximation (or tiers of approximation) of how secure a Brain Wallet is to A key ...
8
votes
2answers
918 views

How vulnerable is bitcoin to quantum algorithms? [duplicate]

Assuming that quantum computers are implemented some time in the near-ish future, how vulnerable is Bitcoin to decryption via quantum algorithms? For example, Shor's algorithm enables a quantum ...
3
votes
2answers
156 views

Code modification could lower mining-difficulty requirements, why isn't this a vulnerability?

What prevents a bitcoin miner from modifying the code to make mining easier instead of more difficult ?
4
votes
1answer
142 views

Wouldn't compromised crypto require entire block chain to be recomputed?

If one of the cryptographic building blocks of Bitcoin were to be broken, couldn't that result in the entire block chain needing to be recomputed? And how would that work, given the computational ...
5
votes
2answers
308 views

Could miners steal money?

I've been reading around: https://en.bitcoin.it/wiki/How_bitcoin_works What prevents a miner's block from being accepted across the network if the hash checks out when miner forges transactions in ...
2
votes
2answers
633 views

Strategies against Bitcoin

With the recent increase in articles about the threat of Bitcoin vs central banks, government and other authorities over the money supply, I am wondering how well authorities are prepared and actively ...
2
votes
1answer
95 views

Where can I learn more about BIP30; namely the exploit and the background discussion?

I'm having trouble understanding the bug that was fixed in BIP030, and how it would be exploited. Is the premise of this attack that there would have to be a netsplit and the chain was forked, then ...
7
votes
1answer
155 views

What are the most notable attacks on pools?

Since Bitcoin's inception there have been several attacks on mining pools. There was the Linode problem, where some 46,000 BTC were stolen from pool accounts. What are some other notable attacks on ...
0
votes
1answer
150 views

Do the DNS servers make Bitcoin more secure than the IRC channel? [duplicate]

Possible Duplicate: How secure are the DNS servers for Bitcoin? In earlier version of Bitcoin the IRC channel was used to seed initial peers, and as of version 0.6 it was largely replaced ...
1
vote
1answer
265 views

How could the protocol or client be altered to mitigate a timejacking attack?

I've read about the proposed Timejacking attack: http://culubas.blogspot.com/2011/05/timejacking-bitcoin_802.html There are a number of solutions proposed, but it seems like there might be a simpler ...
7
votes
2answers
259 views

Why would you need to “catch up” in the 51% attack?

There is a lot of information on the 51% attack where an attacker is able to branch the chain and "catch up" and build a new branch that is longer than the old branch. Other than requiring more than ...
2
votes
3answers
169 views

Address creation in standard client - random library?

Is the random library used by the standard client in any way deterministic, or can one count on it being truly random? For example, often random libraries are initialized with seed value of the ...