Quote from: Come-from-Beyond on April 13, 2017, 10:59:47 AM

Quote from: Ayers on April 13, 2017, 10:33:10 AM

it's false, that quantum can break sha 256

To stay 128-bit secure against collisions all hash functions must have at least 384-bit length in post-quantum epoch. If collisions are allowed and only invertibility needs to be preserved then 256-bit length is fine.

i didn't know about this, thanks for clarification, so to have 256 bit secure against collision you need 384 x 2 bit?

Quote from: merc84 on April 13, 2017, 12:43:16 PM

Quote from: Ayers on April 13, 2017, 10:33:10 AM

Quote from: cryptonia on April 13, 2017, 09:46:13 AM

Nexus claims to be

http://www.nexusearth.com/

Quote

In addition to checks and balances in consensus and Trust Keys with Network recognized Reputation providing greater security and network stability, Nexus also has Quantum Computer Resistant Private Keys with 571-bit encryption (much more secure than Bitcoin). Meaning, Nexus serves the WORLD as the most secure cryptocurrency to date.

I also thought I heard someone from Heat talking about this but I'm not sure if Heat is (maybe)

it's false, that quantum can break sha 256, they are spreading misinformation in fct it's not sha256 which is in danger of quantum when they will be available, but it's a round of hash to have the private key, i think it was called ECDSA but i maybe wrong, this is vulnerable, and if nexus is using this for their private key they will be vulnerable also

Nexus is using 571bit priv keys, still as i believe it is using elliptic curve cryptography but having a greater bit length means it would require much more qbits to crack than bitcoin for example. Theres no such thing as quantum proof only quantum resistant cryptography.

Also regarding the argument that bitcoin can simply fork to a new algo, no one can even agree on how to solve the scaling issue with bitcoin i wouldn't bet on a hard fork to change anything in bitcoin being adopted in a short span of time. The time in which it took to reach consensus would leave any priv key used more than once vulnerable.

if nexus use ECDSA then nexus have the same vulnerability as bitcoin

Quote from: Visin on April 13, 2017, 12:47:56 PM

If there was a Quantum computer mining an Altcoin wouldn't that be a good thing for the investors? Only so many coins could get mined and the whole fact that a Quantum Computer is mining the coin would bring more people into the project right?

i think quantum computer would be unfair, could mine multiple coins at once and not only one, without losing hash like you do know with a cpu coin, if you have 1khs with a cpu now you can mine two coin with 500hs each, but with quantum remain 1khs for both coins