1
General Discussion / Re: On 51% Attacks
« on: May 23, 2014, 09:26:04 pm »But a more subtle attack is to only produce the block for 50% of your peers and not give it to the other 50% *AND* to do it at the last possible moment such that some peers include it and others don't.
I am not expert, but I remember BTT thread about how Nxt works:
Let's say I have 25% of NXT coins. And I want to mount an attack. I need to do the following.
1. Wait until I am selected as a forger.
2. Create 2 blocks, one for the network and one I hold back.
3. Continually add more blocks to the block I hold back. This is my chain I will introduce later as my attack.
The problem is step 3. To add another block to my held back block I need to be selected as the forger for that block too. However forger selection is based on the hash of the previous block and my account address.
Neither of these I can change quickly enough to be sure I generate the next block. So my probability of being selected to build the next block is 25% for each block.