What is SHA-512?

SHA-512 (Secure Hash Algorithm 512-bit) produces a 512-bit (64-byte) hash, displayed as a 128-character hexadecimal string. Part of the SHA-2 family, it provides a larger security margin than SHA-256. SHA-512 is actually faster than SHA-256 on 64-bit processors due to native 64-bit arithmetic. It is used in TLS handshakes, Ed25519 signatures, and HMAC authentication.

# Generate SHA-512 hash from command line
echo -n "hello world" | sha512sum

# Python
import hashlib
hash = hashlib.sha512(b"hello world").hexdigest()
print(hash)  # 309ecc489c12d6eb...

# Node.js
const crypto = require("crypto");
crypto.createHash("sha512").update("hello world").digest("hex");

When to use SHA-512

SHA-512 is preferred in environments that process 64-bit data natively, such as modern servers and desktops. It is commonly used in digital signatures, certificate authorities, secure file verification, and applications requiring maximum hash security margin. For password hashing, pair SHA-512 with a salt and key-stretching algorithm like bcrypt or Argon2 rather than using it directly.