That is flatly incorrect. A secp256k1 private key has slightly less than 256 bits of entropy. But that is irrelevant:
If quantum computers can break that encryption, then bitcoin would be one of many systems affected, since it is currently more secure than others.
Maybe there would be a security update when that situation is at hand.
Hi sir, since this post is about blockchain, asking something related to entropy might be off-topic. Nevertheless..
So, the private key in BTC has a maximum of 256 bits of entropy. No matter how complex the entropy I am putting in in the first place, it will end up producing me a root key with 256 bits(even if I was initially putting in HEX in 1000-bit entropy or 10000 bit). Because in the end, after SHA256, it becomes 256bits..
So, my question is:
Will there be two different input producing the same hash result? (hypothetically, a 200-bit input entropy produces the same hash result of 20000bit...)
Maybe that's a stupid question to ask..