SHA-256 is a cryptographic hash function from the SHA-2 family. It produces a 256-bit (64 hex character) hash and is widely used for data integrity and digital signatures.
Yes. SHA-256 is currently considered cryptographically secure and is used in SSL certificates, Bitcoin, and many security protocols.
No. SHA-256 is a one-way function. It is computationally infeasible to reverse it to get the original input.
SHA-256 is the hashing algorithm used in Bitcoin mining and transaction verification. Each block in the Bitcoin blockchain contains a SHA-256 hash of the previous block.
A SHA-256 hash is always 64 hexadecimal characters (256 bits) regardless of the input length.
SHA-256 alone is not recommended for password hashing because it is too fast. Use bcrypt, Argon2, or PBKDF2 which are designed to be slow and resist brute-force attacks.
SHA-256 produces a 256-bit hash. SHA-512 produces a 512-bit hash. SHA-512 is slightly more secure but produces a longer output. Both are currently considered secure.