Keccak Hash Text or File

Generate Keccak hash for text input or file upload. Calculate secure cryptographic checksums for data integrity verification and security purposes

Output Length
256
Input
Paste or type any UTF-8 text, including emoji and non-Latin characters.
Hash Result
Hash result for the current text input.

Hexadecimal

Base64

Decimal

Binary

What is Keccak?

Keccak is a family of cryptographic hash functions that serves as the foundation for the SHA-3 (Secure Hash Algorithm 3) standard. Developed by Guido Bertoni, Joan Daemen, Michaël Peeters, and Gilles Van Assche, it won the NIST hash function competition in 2012.

Key characteristics:

  • Sponge construction: Uses an innovative sponge function design with absorbing and squeezing phases
  • Variable output length: Can produce hash outputs of any desired length
  • High security margin: Designed with substantial security reserves
  • Different from SHA-1/SHA-2: Based on entirely different mathematical principles
  • Keccak[c=2d] variant: This implementation uses the original Keccak specification with capacity c = 2d (where d is the output length)

Keccak vs SHA-3 (FIPS 202) differences: 🔍 Important distinction: The original Keccak and the standardized SHA-3 are not identical:

  • Original Keccak: Uses capacity c = 2d and different padding (Keccak padding: 0x01)
  • FIPS 202 SHA-3: Uses capacity c = 2d but different padding (SHA-3 padding: 0x06)
  • Domain separation: The padding difference ensures that Keccak and SHA-3 produce different outputs for the same input
  • This tool implements: The original Keccak specification with Keccak[c=2d] parameterization

Security status: ✅ Keccak is considered highly secure with no known practical attacks. It provides excellent security margins and resistance against various cryptanalytic techniques.

Common uses:

  • Ethereum blockchain (uses original Keccak-256)
  • Academic research and cryptographic protocols
  • Applications requiring variable-length hash outputs
  • Systems needing alternatives to SHA-2 family
  • Blockchain and cryptocurrency implementations

Advantages over traditional hashes:

  • Fundamentally different design reduces risk of related attacks
  • Flexible output length (not limited to fixed sizes)
  • Strong theoretical security foundation
  • Resistance to length extension attacks
  • Excellent performance on various platforms

Technical note:

  • Keccak-256: Produces 256-bit output (most common variant)
  • Capacity formula: c = 2d ensures appropriate security level
  • Ethereum usage: Ethereum specifically uses original Keccak-256, not SHA3-256