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Topic: 量子计算机与比特币 - page 3. (Read 5779 times)

hero member
Activity: 714
Merit: 500
August 06, 2014, 01:20:59 PM
#21
51%攻击,量子计算危机,比特币其实并不完美,仍是一场试验。
任何绝对安全的东西只要有人的介入就不会安全了

51%攻击可以理解成股份制公司有人拥有了51%以上的股权,这人对整个公司拥有話事权是无可厚非的

量子计算机的出现是整个互联网灾难,几乎所有东西都会被推到洗牌,也不缺比特币了
hero member
Activity: 630
Merit: 500
August 06, 2014, 01:17:21 PM
#20
51%攻击,量子计算危机,比特币其实并不完美,仍是一场试验。
比特币的一些先天性的设计问题好像可以通过一些新软件和技术来解决,乐观点。
legendary
Activity: 896
Merit: 1000
August 06, 2014, 01:06:53 PM
#19
51%攻击,量子计算危机,比特币其实并不完美,仍是一场试验。
member
Activity: 102
Merit: 10
August 06, 2014, 09:05:25 AM
#18
等这个东西出来了再说,花这么钱研究这个就为针对比特币?
hero member
Activity: 630
Merit: 500
August 06, 2014, 08:54:26 AM
#17
量子计算机跟现在的计算机或超级计算机有什么区别,请大神科普一下  Sad
量子计算机(quantum computer)是一类遵循量子力学规律进行高速数学和逻辑运算、存储及处理量子信息的物理装置。当某个装置处理和计算的是量子信息,运行的是量子算法时,它就是量子计算机
其实我也不懂,不过我会问度娘
度娘的解释也很多用了述词,很难理解。
sr. member
Activity: 252
Merit: 250
August 06, 2014, 07:52:51 AM
#16
照目前的的技术来看很难用一个公钥推出私钥,
这种技术可能数年后才会出现,到时比特币还有没有都不好说
hero member
Activity: 714
Merit: 500
August 06, 2014, 07:46:44 AM
#15
詳細看這個: http://bitcoinmagazine.com/6021/bitcoin-is-not-quantum-safe-and-how-we-can-fix/
這裡有你們所有想知道的!

這是公鑰被量子計算機破解所需時間等級:
Quote
Shor’s algorithm reduces the runtime of cracking elliptic curve cryptography from O(2^k/2) to O(k^3) – that is to say, since Bitcoin private keys are 256 bits long, the number of computational steps needed to crack them goes down from 340 trillion trillion trillion to a few hundred million at most.

就算地址沒花過錢也不安全,危險就在花錢的那一刻,當交易開始廣播的時候,交易可能被不誠實礦工攔截,直接把私鑰破解,然後就呵呵
Quote
If you send a transaction spending all 100 BTC in address 13ign, with 10 BTC going to 1v1tal to pay for goods and 90 BTC change going back to your new address at 1mcqmmnx, the first node that you send the transaction to can replace the change address with whatever they want, recover the private key from your public key, and forge your signature. The only way to get around the problem is essentially to send the transaction directly to a mining pool, like BTCGuild or Slush, and hope that the mining pool will be honest and place the transaction directly into the blockchain. Even then, however, you are vulnerable to a Finney attack – a dishonest miner can forge your signature, create a valid block containing his forged transaction continuing the blockchain from one before the most recent block (the one containing your transaction), and, since the lengths of the old and new blockchains would then be equal, the attacker would have a 50% chance of his block taking precedence. Thus, safe transactions are essentially impossible.
full member
Activity: 228
Merit: 100
August 06, 2014, 07:43:42 AM
#14
关键在于黑客能不能买到或者组装量子计算器。
目前没有什么问题
full member
Activity: 228
Merit: 100
August 06, 2014, 07:42:16 AM
#13
你说的我没听说过!
newbie
Activity: 52
Merit: 0
August 06, 2014, 03:44:46 AM
#12
关键在于黑客能不能买到或者组装量子计算器。
newbie
Activity: 42
Merit: 0
August 06, 2014, 03:02:09 AM
#11
玩硬分叉,多重算法
full member
Activity: 122
Merit: 100
August 06, 2014, 02:59:32 AM
#10
量子计算机要是出来不用操心这比特币安全.先着急的是银行.他们的网银也不牢靠,
到时候世界各家银行都会有应对的方法的,这就属于紧急情况了
full member
Activity: 122
Merit: 100
August 06, 2014, 02:58:49 AM
#9
量子计算机跟现在的计算机或超级计算机有什么区别,请大神科普一下  Sad
量子计算机(quantum computer)是一类遵循量子力学规律进行高速数学和逻辑运算、存储及处理量子信息的物理装置。当某个装置处理和计算的是量子信息,运行的是量子算法时,它就是量子计算机
其实我也不懂,不过我会问度娘
sr. member
Activity: 252
Merit: 250
August 06, 2014, 02:55:59 AM
#8
量子计算机要是出来不用操心这比特币安全.先着急的是银行.他们的网银也不牢靠,
sr. member
Activity: 312
Merit: 250
August 06, 2014, 01:26:39 AM
#7
这是比特币的命门。但是,量子计算机在发展,加密算法也会发展,所以事在人为,没必要提前恐惧和应对。
hero member
Activity: 630
Merit: 500
August 05, 2014, 11:31:33 PM
#6
量子计算机跟现在的计算机或超级计算机有什么区别,请大神科普一下  Sad
full member
Activity: 187
Merit: 100
August 05, 2014, 11:29:00 PM
#5
那岂不是很牛逼啊
hero member
Activity: 714
Merit: 500
August 05, 2014, 11:12:35 PM
#4
如果真的可以通过公钥找到私钥,那比特币体系就算是玩完了。
比特币数量排名前10名的比特币地址都在那放着呢. 能找到私钥就去吧. 通过公钥找到私钥那天就是比特币完蛋那天.
hero member
Activity: 518
Merit: 500
August 05, 2014, 10:39:21 PM
#3
如果真的可以通过公钥找到私钥,那比特币体系就算是玩完了。
legendary
Activity: 896
Merit: 1000
August 05, 2014, 10:33:33 PM
#2
我不搞技术不懂这些计算函数,但是关于量子计算机与比特币的问题好像讨论过很多次了,危险真的存在?求解答。
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