# How is SHA256 calculated?

3 Answers. SHA-256 uses an internal compression function f which takes two inputs, of size 512 and 256 bits respectively, and outputs 256 bits. … Input message M is first padded by appending between 129 and 640 bits (inclusive), resulting into a padded message M′ whose length (in bits) is a multiple of 512.

## Is sha2 safe?

SHA-256 is not a secure password hashing algorithm. SHA-512 neither, regardless of how good it has been salted.

## Is SHA512 better than SHA256?

Note that SHA512 is a lot slower to compute than SHA256. In the context of secure hashing, this is an asset. Slower to compute hashes mean it takes more compute time to crack, so if you can afford the compute cost SHA512 will be more secure for this reason.

## What is an example of Blockchain?

One of the more famous examples of Blockchain in action is Bitcoin. This is a digital currency (commonly called a cryptocurrency). … Bitcoin Atom (BCA) is a fork of Bitcoin and provides a truly decentralised way of exchanging cryptocurrencies without trading fees and no exchange hacks.