Introduction

1. sha (secure hash algorithm abbreviation) is a series of encrypted hash functions.

2. sha includes multiple different hash functions, most famously sha-1, and the safer sha-2 and sha-3 series.

3. sha-2 is considered safe, especially sha-256 and sha-512, and there is currently no way to destroy its security.

4. note: since the sha series hash functions are one-way and the original data cannot be derived, it is also called the "encrypted hash function".