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### How does this algorithm work? ( SHA-2 as its core function) [closed]

Given the following customed hashing algorithm, which uses SHA-2 as its core function [F], it is proven that 2 main hash characteristics 1) One Way Hash and 2) Collision Resistance can be compromised ...
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### How long would it take all of the supercomputers or cloud computing on Earth to bruteforce a significantly long password?

I was arguing with a colleague who thinks that SHA256 (password + 64 character static salt) is "insecure." My argument is that nothing in cryptography is "secure," it's all a ...
Let curve $A: y^2 = x^3 + 7$ and curve $B: y^2 \equiv x^3 + 7 \pmod{p}$ Curve $B$ is secp256k1, assume the usual parameters for that curve. Let $k$ be any private key, and compute the corresponding ...