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SHA3-512 Hash Generator

Generate SHA3-512 hashes online instantly. The largest and most secure SHA-3 variant, NIST FIPS 202 standard. 512-bit (128 hex character) output. Supports UTF-8, Hex, Base64 input and HMAC-SHA3-512.

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SHA3-512 FileHash from file SHA3-256256-bit SHA-3 SHA3-384384-bit SHA-3 SHA512512-bit SHA-2 BLAKE2b512-bit BLAKE2

Frequently Asked Questions

What is SHA3-512?
SHA3-512 is the 512-bit, most secure variant of SHA-3, standardized in NIST FIPS 202. It uses the Keccak sponge with a 576-bit rate and 1024-bit capacity, producing a 128-character hexadecimal digest.
SHA3-512 vs SHA-512 — which should I choose?
Both produce 512-bit digests. SHA3-512 is immune to length-extension attacks while SHA-512 is not. SHA-512 is faster on most hardware. For new FIPS 202-compliant systems, SHA3-512 is preferred. For maximum compatibility with existing infrastructure, SHA-512 is more common.
Is SHA3-512 the most secure hash algorithm available?
SHA3-512 provides 256-bit collision resistance, which is considered computationally infeasible to break with any known or foreseeable classical computing technology. For post-quantum concerns, SHAKE256 with large output lengths may be considered.
How does SHA3-512 compare to BLAKE2b?
Both produce 512-bit output. BLAKE2b is significantly faster than SHA3-512 (often 3-4× faster). SHA3-512 has NIST standardization (FIPS 202). BLAKE2b is preferred for performance-critical applications; SHA3-512 for FIPS compliance.

About SHA3-512 Hash Generator

SHA3-512 is the 512-bit, highest-security member of the SHA-3 family, standardized in NIST FIPS 202 (August 2015). It uses the Keccak sponge construction with a 576-bit rate and 1024-bit capacity — the tightest rate-to-capacity ratio of any fixed-output SHA-3 variant. Input is absorbed in 72-byte blocks, producing a 512-bit (64-byte, 128 hex character) digest.

Highest Security in SHA-3

The 1024-bit capacity of SHA3-512 provides 512-bit preimage resistance and 256-bit collision resistance. This exceeds NIST's requirements for "beyond 2030" security under SP 800-131A and provides a substantial security margin against all known attacks including quantum computing considerations (Grover's algorithm halves preimage resistance, leaving 256-bit security).

Length-Extension Attack Immunity

Unlike SHA-512 (which uses Merkle-Damgård construction), SHA3-512 is immune to length-extension attacks. An attacker who knows H(m) cannot compute H(m||extension) without knowing the original message m. This property is inherent to the sponge construction and does not require HMAC for protection.

Performance Considerations

SHA3-512 processes input in 72-byte blocks, which is smaller than SHA-512's 128-byte blocks. This means SHA3-512 requires more permutation calls per byte of input, making it slower than SHA-512 on most hardware. For performance-critical applications requiring 512-bit output, BLAKE2b is significantly faster while maintaining strong security properties.

HMAC-SHA3-512

While SHA-3 is inherently resistant to length-extension attacks, HMAC-SHA3-512 is still supported for compatibility with HMAC-based systems and provides a standardized keyed authentication approach. Enable HMAC above and enter your key to compute HMAC-SHA3-512.