Topic: Is bitcoin System Vulnerable ? - page 2. (Read 2320 times)

nope i think bitcoin system has been very good and safe if you're clever in securing your bitcoin in a wallet. you will never be stolen
and I have never felt my bitcoin stolen

Yes it's true that until we live we will not see all the private keys being revealed.
How ever if someone gets lucky and generate a Private key of address with 1000+ BTC
Then i think it's only his luck not the exploit of the system.

By their explanations, you can see that Satoshi is a genius.
Don't worry, mate. Your money is safe here.
Just be cautious on what wallet you are using.

I think Bitcoin system have vulnerabilities, but it is unexploitable at this time due to the limited technology.  There are theories about the quantum computer being able to crack hashes of bitcoin but as far as I know as technology develop, so as the security around it.  It may be possible for quantum computers to crack bitcoin private key at this current bitcoin state but when time came that quantum computers are available, bitcoin security would have upgraded by that time.

I don't think it's that easy to take control all the wallet. We have seen some sites were hacked, but it doesn't mean that all the private key can be hacked so easy as well. in other hand we know that many secure ways to make your private keys secure, so I think to get all people's private keys is difficult.

there is not impossible for anything in this world even for bitcoin itself. but i think its really need more times to be hacking bitcoin and its need big resource and capability, beside that we should have excellent in programming language.

i really don't know what will happen if bitcoin gets hack because i am not understand about programming language. i only know about how to make money with bitcoin.

The only issue I can see with Bitcoin security is going to be quantum computers in the future, and even that is a fairly long ways away at the rate things are going. OP, there is no way to stop someone trying to brute force your key. It will take them a lot of time and chances are you won't get your key stolen.

quantum computers are process for process a couple tousand times better at some solutions compared to binary computers.
quantum can solve non binary problems faster. because they are not binary logic. and normal computer have issues with non binary logic problems.

but when a quantum has to handle a binary logic problem. it limits quantum to the scope of binary logic and so the effectiveness and efficiency is not 100%

so relax.

You can't stop someone from brute forcing a private key, similar to how you can't stop someone from brute forcing a password (aside from using something like a captcha). I don't believe that anyone will ever get admin access to all of the wallets.

Personally, I don't worry about anything like that. It just isn't enough of a threat right now.

I don't know, I have bit afraid about quantum computers, because they can solve in theory things very fast compared than normal computers and the cryptography is little weak in this position.

I hope this problem is fixed,before quantum computers be a reality.

we should never think of bitcoin as indestructible otherwise people get lazy and dont continue protecting it.
EG one:
it only requires a hacker to use bitnodes website to find all IP addresses of all ~5200 nodes and some possible DDoS/virus tool to delete the historic data before taking them offline all in one swoop.

the chances of that being possible is low. but we should not think ~5200 nodes is a safe secure number to live with. we need more nodes to further reduce risks

EG two:
if all ~5200 nodes were running the code of one implementation, and that implementation has a bug/intentional trojan. again the whole lot goes.

the chances of that being possible is low. but we should not think one implementation is safe to live with. we need more diversity to further reduce risks.


quantum computers work differently. and can do some surprising things that binary(regular) computers cant.
but getting a QC to solve a binary computer. restrains QC into certain limitations. which only results in a QC beign 2x efficient in comparison to regular computers when it comes to solving binary logic. ASICS and the amount of ASIC running has already averted the risk QC can pose.
so relax. D-waves QC may be technically faster then many regular computers but is no way near the power of an asic, and no way near the power of all the asics mining bitcoin.

but we should continue increasing the difficulty and adding more ASICS to continue strengthening bitcoin so that other technology cannot overtake in the distant future

everything is possible to do, there just isnt a person alive with the time left to do it, and there never will be.

Brute Forcing Base58 ? What is the probability of that happening as a successful attack ? There goes a failed one,followed by many https://github.com/Marclass/BritExploit/blob/master/src/bruteForcer/BruteForce.java

This dude has put it in brief,most simple and to the point information I found so far

http://blog.richardkiss.com/?p=371

That is absurd.There is literally no specific database as such.Bitcoin wouldn't be as successful if they put it all in a static database. 

At the moment there is no 100% "malware proof" system so I guess Bitcoin system is vulnerable too. The question is how.much is realy vulnerable and how likely is for something like this to happen. Having in mind the Bitcoin system structure there is no much chance for such security breach, at least not at the moment.

Consider the size of a database necessary to do what you suggest, i.e search for private key based on bitcoin address.

A minimum-sized database would simply be a list of private keys -- one for each bitcoin address. This database would require 32 bytes per bitcoin address, and there are 2¹⁶⁰ addresses, so the database would have to be at least 2¹⁶⁵ bytes in size.

How big is 2¹⁶⁵ bytes?

According to this article in 2011:

295 exabytes is about 2⁶⁸ bytes, so a database with 2¹⁶⁵ bytes would be 2⁹⁷ (about 160,000,000,000,000,000,000,000,000,000) times the current storage capacity of the entire world.


How long would it take to generate this database?

First, you need to generate addresses for at least 2¹⁶⁰ private keys to generate the entire database. Let's use that number to simplify things.

A top-of-the-line PC can generate nearly 64 million (2²⁶) addresses per second (https://en.bitcoin.it/wiki/Vanitygen#Expected_keysearch_rate). At that rate it would take about 2¹³⁴ seconds, or 6.9x10³⁰ (6,900,000,000,000,000,000,000,000,000,000) centuries to generate the database. There are about 2 billion PCs in the world (https://www.reference.com/technology/many-computers-world-e2e980daa5e128d0). If every PC in the world was a top-of-the-line PC and was working on this database, then you could cut it down to only 3,500,000,000,000,000,000,000 centuries.

Go for it!

I know it's not easy even if you use script because there are more than billions of pages with more than 50 Address per page.
I also know this if it's that easy then everyone will steal btc from one another.

Quantum Computers will cause the demise of Bitcoin. That's my fear.  

"easily"? I don't think you really want to use that word when searching for a particular address in the entire Bitcoin addresses possible. If that can "easily" be done, then people would just be stealing Bitcoins away from each other. Explore the directory.io a little and you'll see the amount of Bitcoin addresses that is in there.

Do you honestly think if you press CTRL + F in your notepad, you can easily see a particular address? That's a lot of waiting to do, your computer might even overheat just because of that. Even just importing all the info in directory.io into a .txt file would take some time even if you're using a certain script to do the work.

Bitcoin greatest vulnerability

https://bitcointalk.org/index.php?topic=1516755.msg15262075;topicseen#msg15262075