How to display hash digests

1. What is the digest of a hash?
2. Why can t SHA256 be reversed?
3. What is a digest in Blockchain?
4. What does hash function return?

What is the digest of a hash?

Definitions: The result of applying a hash function to data. The result of applying a cryptographic hash function to data (e.g., a message).

Why can t SHA256 be reversed?

SHA256 is a hashing function, not an encryption function. Secondly, since SHA256 is not an encryption function, it cannot be decrypted. What you mean is probably reversing it. In that case, SHA256 cannot be reversed because it's a one-way function.

What is a digest in Blockchain?

A digest is a short fixed-length value derived from some variable-length input. Cryptographic digests should exhibit collision-resistance, meaning that it's hard to come up with two different inputs that have the same digest value.

What does hash function return?

The hash() function returns a 128-bit, 160-bit, or 256-bit hash of the input data, depending on the algorithm that you select. This function provides 2¹²⁸- 2²⁵⁶ distinct return values and is intended for cryptographic purposes. The function almost never produces the same output for two different inputs.