# expected sha256 hash electrum, 2020 SHA-1 Hashes - Azure DevOps

Libsnark's gadget1 library implements various gadgets around sha256 (bit-based hash function). ethsnarks implements fieldalt_bn128 hash-based functions (mimc, pedersen, poseidon, etc.) on this elliptical curve.

hash :?sha256. Sum256 (prev Hashes)

SHA256 is a password hash function, enter any piece of information, run SHA256 function, the output result will be a string of 256-bit 2-in- number, this number is the hash value of this information or summary, can be understood as a specific ID of this information.

Among them, the hash function is an algorithm. Bitcoin uses a hash function called SHA256, a 256-bit hash algorithm that represents security, originally used by the NATIONAL Security Agency.

Rake may think that the SHA256 hash function is secure enough for Ethereum 2.0, which is more concerned with interoperability with Ethereum 1.0 and other blockchain projects. However, it is not yet possible to determine whether Ethereum 2.0 uses the SHA256 hash algorithm.

In the blockchain world, the most commonly used hash function is SHA256, which is one of the encryption algorithms in the SHA (Security Hash Algorithm) family, while bitcoin's address generation uses a dual SHA256 (encrypted twice) mechanism to improve the security of the system.

Therefore, the design has been modified to hash the input using double-SHA256, which is the standard hash method for Bitcoin.

Hash reduced by 30% since halving (only SHA256 hash?2%)

If the hash is on the chain, they can see it there through a search. The invoice sent by e-mail is a SHA256 hash.

## What is the "Sha256" hash operation?

The Litecoin hash protocol uses a Scrypt-based algorithm, unlike the SHA256 algorithm used on Bitcoin.

Base64 encodes the SHA256 hash and uses the first 24 characters as the key.

## let hash s sha256.

With the Hash calculation tool, I enter clear text 123456 to get the corresponding hash value (press SHA256)

We can know the part, F- is often hash function md5, sha256, etc.

In the blockchain world, the most commonly used hash function is SHA256, which is one of the encryption algorithms in the SHA (Secure Hash Algorithm) family, while Bitcoin's address generation uses a dual SHA256 (encrypted twice) mechanism to improve the security of the system.

## 1, sha256 hash.

SHA256 Hash #1 / sha256_h.Reset() sha256_h.Write (bcpy) hash1 : sha256_h.Sum (nil)

Stay tuned for the next article, which describes hash algorithms (HMACSHA1, HMACSHA256, SHA1, SHA1WithRSA, SHA256, SHA256WithRSA).

Iterate file_list to calculate imphash and sha256 file hash.