I do not only mean breaking the encryption but also slowing down the network with some type of stress-attack or attempt to influence it in the bad way. Who has ever tried this and what was the result? Obviously, I do NOT prepare to do such a thing, I am just writing a research about blockchain and its resistance against hacking.
In my opinion it can't hacked ever Because the main reason is that we can't recover the password but still here is a chance to hack if a user have email.id with the same password that the blockchain wallet have then if anyone made fishing attack than he can try for the blockchain wallet and can excess all the data transaction of bitcoin .
Well just here I is a matter of thing if the user remain only small wise then his wallet can never be hacked by anyone because I myself from 3 years never get hacked .
It looks like you're mixing up two things:
blockchain.info = wallet provider (amongst a couple of other things) = private company NOT owning the blockchain technology
the blockchain = technology of a decentral ledger, on which bitcoin has been built
The blockchain is pretty safe, sure there might have been some startup issues, but nowadays it looks like the technology is solid. Blockchain.info is a private company, using loads of different technology and languages to provide an online wallet. It wouldn't supprise me if they got hacked sooner or later...
The OP and all other posters were talking about the blockchain technology, not the wallet