Bitcoin Forum
December 11, 2017, 08:48:31 AM *
News: Latest stable version of Bitcoin Core: 0.15.1  [Torrent].
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: Litecoin Attack and Defense  (Read 4754 times)
VelvetLeaf
Member
**
Offline Offline

Activity: 98


View Profile
July 28, 2012, 02:40:18 PM
 #1

Although an attacker can get advantage by knowing this data, I believe this data should be public so everyone know and can react now.

Let's say, someone want to launch 51% attack on Litecoin network.
He can do this by DDoS-ing all mining pool at once, while mining in secret.
Once most big pools down and his chain reach 51% network speed, he'll release his chain and force the network to join his chain.

He'll rent botnet / Amazon EC2 server.

Capability of Amazon EC2 server :
1. CPU : 2 x Intel Xeon X5570, quad-core "Nehalem" architecture
2. 2 x NVIDIA Tesla "Fermi" M2050 GPUs

Speed :
CPU : 58 kH/s
GPU : 155 kH/s
Total : 213 kH/s
Cost : $2.1 / hour slepp said it's $3...  I don't really remember.

slepp already test this with cgminer, let's say the attacker has 700 instance of Amazon EC2.
Cost : $3 / hour * 700 = $2,100 / hour
Speed : 213 * 700 = 149,100 kH/s = 149 MH/s

Total Litecoin network = 240 MH/s taken from http://www.litecoinpool.org/pools




To 51% the network, the attacker will DDoS-ing 3 big pools simultaneously :
LiteCoinPool.org - 26.7%
LTCMine.ru - 20.2%
Coinotron - 18.9%
With 65.2% of network speed down, network hash rate will be 86,526 kH/s

Our botnet hash rate is 149 MH/s.
Total network now : 86 MH/s
Botnet % hash rate compared to the network : 149 / (149 + 86) = 63%

149 MH/s is enough to launch the 51% attack.

Point of the attack :

1. July - Late September is the baby period of Litecoin
network hash rate is still growing, anyone may attack and cripple it before it reach its max potential.
More GPU user will join in October more due to ASIC phase, which will make GPU mining unprofitable.
If you believe in Litecoin's future and you're a GPU user, please join in now to secure the network.

Litecoin Profitability :
https://github.com/litecoin-project/litecoin/wiki/Mining-hardware-comparison
http://www.litecoinpool.org/calc

2. Mining pools shouldn't have > 20% network hash rate
Because if your pool is down, network hash rate will really down a lot.
Miners should decentralize and join various mining pools : https://github.com/litecoin-project/litecoin/wiki/Comparison-of-mining-pools

Some miners should create their own private mining pool, go solo mining or join p2pool to prevent DDoS attack.
Solo Mining Tutorial on Windows : https://bitcointalk.org/index.php?topic=83371.0
P2Pool Pack : https://bitcointalk.org/index.php?topic=95061.0

3. Backup Pools
If you choose to join a mining pool, set up backup pools.
Cgminer has this feature, with multiple -o
cgminer -o http://pool1:port -u pool1username -p pool1password -o http://pool2:port -u pool2usernmae -p pool2password

4. Upgrade your server
Don't host Litecoin server on VPS / weak server, especially if you have > 15% network hash rate.
Prepare to get attacked and get downtime a lot if your server is not ready for the attack.
People that invest a lot in litecoin may rent a ddoser service and "test" if your server is "ddos-ready" for future DDoS attack.

5. Real attack is possible.
This is not a joke, the attack scenario is real.
Don't wait until it's too late, if you care about your investment, you should participate in securing the network by doing 1-4.
The real attacker won't provoke you and provide the timeline information
He'll probably launch it when most pool owners are asleep.

Feel free to correct me or add something here.

As comparison, here's bitcoin pool stats
Unknown get 29% network hash speed, which is nice because you can't DDoS private pool / solo miner.

BTC : 1GN81dxzxyFPQsyAtdocXr5S9Mcg4wcfFG
LTC : LgmYvXsYXc4xdjsMKXJWqtagxVvioK6iaw
FC : 6dpSnKMtttUUYzaRu1EB7Lu18PBRVHU3V7
1512982111
Hero Member
*
Offline Offline

Posts: 1512982111

View Profile Personal Message (Offline)

Ignore
1512982111
Reply with quote  #2

1512982111
Report to moderator
1512982111
Hero Member
*
Offline Offline

Posts: 1512982111

View Profile Personal Message (Offline)

Ignore
1512982111
Reply with quote  #2

1512982111
Report to moderator
1512982111
Hero Member
*
Offline Offline

Posts: 1512982111

View Profile Personal Message (Offline)

Ignore
1512982111
Reply with quote  #2

1512982111
Report to moderator
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1512982111
Hero Member
*
Offline Offline

Posts: 1512982111

View Profile Personal Message (Offline)

Ignore
1512982111
Reply with quote  #2

1512982111
Report to moderator
NASDAQEnema
Full Member
***
Offline Offline

Activity: 182


View Profile
July 28, 2012, 04:43:02 PM
 #2

In the non-living physical world, when too much pressure or force is placed on an object, it breaks from the whole. It does not grow a new leg while the other leg faces blood loss and hibernates.
In the living physical world, you get a fever (which can kill you), a scar develops, platelets heal the wound. Getting shot in the arm does not create a new arm.

Cryptocoins naturally have a mix of both worlds. They are mechanically generated to serve purposes of networks of living people.

First, we should look at 51% as the natural result of a pure contest based model. Whoever is fastest wins.
Second, the threat 51% poses is not due to lack of tyrant nodes. It is due to failing to simply jettison the threat.
Third, it could be more than 51% if we had a design where characteristics worked for certain uses but not others.
Fourth and final, we could actually use 51% as a gentler way to start a new chain.

A few friends are working on this. We'll probably use litecoin than bitcoin as a base because the halving points allow more development between them, and technological jumps are less severe than in bitcoin.


If you feel Universe has trolled you exclusively, please donate to Emergency Butthurt Support Fund:
1Jv4wa1w4Le4Ku9MZRxcobnDFzAUF9aotH
Proceeds go to Emergency Butthurt Escape Pod none of you will be allowed to use. If you have read this far, you must pay Emergency Butthurt Internet Tax.
Bitcoin Oz
Hero Member
*****
Offline Offline

Activity: 700


Wat


View Profile WWW
July 29, 2012, 08:36:54 AM
 #3

In the non-living physical world, when too much pressure or force is placed on an object, it breaks from the whole. It does not grow a new leg while the other leg faces blood loss and hibernates.
In the living physical world, you get a fever (which can kill you), a scar develops, platelets heal the wound. Getting shot in the arm does not create a new arm.

Cryptocoins naturally have a mix of both worlds. They are mechanically generated to serve purposes of networks of living people.

First, we should look at 51% as the natural result of a pure contest based model. Whoever is fastest wins.
Second, the threat 51% poses is not due to lack of tyrant nodes. It is due to failing to simply jettison the threat.
Third, it could be more than 51% if we had a design where characteristics worked for certain uses but not others.
Fourth and final, we could actually use 51% as a gentler way to start a new chain.

A few friends are working on this. We'll probably use litecoin than bitcoin as a base because the halving points allow more development between them, and technological jumps are less severe than in bitcoin.



If you can come up with a solution it would be better than bitcoin Smiley

educatedwarrior
Full Member
***
Offline Offline

Activity: 220


View Profile
May 22, 2014, 03:09:08 PM
 #4

New Litecoin Pool at CryptoCulture.Net Mining Pools  

No Mining Fees!
We support all major mining algorithms
VarDiff to fine tune difficulty and mining performance for your individual miners.
SSL Protection
Customer support ticketing system
Single Sign-on System …. Create account and add workers only one time and use for all of our pools.
Dedicated Hardware
Servers with 24/7 support 99.9% up time SLA for mining services
Pool operators are experienced miners

Navigate to http://ltc.cryptoculture.net to set up account
Stratum settings are    stratum+tcp//stratum.cryptoculture.net:3384

Cryptoculture Mining Pools - http://cryptoculture.net      Follow us on Twitter - https://twitter.com/cryptoculture
Pages: [1]
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!