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Author Topic: Possibility of a DDoS attack  (Read 204 times)
coder0x15
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July 16, 2019, 04:41:23 PM
Merited by ETFbitcoin (1)
 #1

Theoretically. This is not a mechanism of any kind of attack, but It's about the "lost" coins. May be. It is just for an educational experiment.

What if someone has the ability to send transactions to the each node's memory pool. He have also the ability to send TCP packets from some list of the internet protocol addresses (65533 IPs against 9686 nodes, for example).

He send transactions, but R and S in it's signature are not formed by the such way as they can be formed by the real owner of the private key. Each node needs to get unsigned TX hash and then check it's Sig for to confirm the output's amount spending. It will take some time.

Is it a theoretically possible DDoS attack to [any]coin network? Each node need to verify signature and it takes some time. Provided that attacker has the full UTXO set locally on his [XXXX] machine IPs.

Or IPv6 folds this "problem"? Or what is really means "bitcoin full-node"?
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July 16, 2019, 04:53:48 PM
Merited by Foxpup (4), bones261 (2), ETFbitcoin (1)
 #2

Node's have rate limiting and will disconnect and refuse connections to and from peers that misbehave (i.e. they ban that node). So if a node sends a bunch of transactions too quickly, they will be disconnected and banned. If they send too many invalid transactions, they will be disconnected and banned. At worst, such an attack would take up a few seconds of CPU time before every node that this attacker has connected to disconnects and bans him.

Also, signature verification isn't all that slow. Nodes already fully validate every transaction they receive which includes signatures. In fact, it's faster to check an invalid signature because it will exit the signature check algorithm early.

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July 16, 2019, 06:22:53 PM
 #3

Even if you managed to DDoS those 9686 nodes, you won't take down Bitcoin network because there are many Bitcoin nodes which IP isn't listed publicly which number is around 60K (according to https://luke.dashjr.org/programs/bitcoin/files/charts/software.html)

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July 18, 2019, 06:40:27 AM
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More importantly, no one benefits from this kind of attack, and the attacker does not gain additional BTC.In theory, the node will return to normal as soon as the attack stops.
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July 18, 2019, 09:58:11 AM
 #5

More importantly, no one benefits from this kind of attack, and the attacker does not gain additional BTC

There are other motives/reasons aside from money, it could be :
1. Blind hate towards Bitcoin
2. Attempt to disrupt Bitcoin network by government/bank, which followed with FUD on media news
3. Live network attack demonstration

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July 22, 2019, 05:25:01 AM
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I think the second one may have a greater impact on the BTC network
Most governments are currently ambivalent about cryptcurrency
Distributed system sounds a little scary Tongue
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