h

{
  "id": "MLC-T-CYB-001895",
  "term": "h",
  "field": "Cybersecurity",
  "definition": "1. An ECC domain parameter; the cofactor, a positive integer that is equal to the order of the elliptic curve group, divided by the order of the cyclic subgroup generated by the distinguished point G. That is, nh is the order of the elliptic curve, where n is the order of the cyclic subgroup generated by the distinguished point G.\n\n2. The length of the PRF output in bits.\n\n3. An integer whose value is the length of the output of the PRF in bits.\n\n4. The hash subkey.\n\n5. An auxiliary function used in certain key derivation methods. H is either an approved hash function, hash, or an HMAC-hash based on an approved hash function, hash, with a salt value used as the HMAC key.\n\n6. In LMS and XMSS, the height of the tree. In XMSSMT, the total height of the multi-tree (the trees at each level have a height of H/D).",
  "references": [
    "NIST SP 800-56A Rev. 2 [Superseded]",
    "NIST SP 800-108r1 [August 2022 (Includes updates as of 02-02-2024)]",
    "NIST SP 800-108 [Superseded]; NIST SP 800-56C [Superseded]",
    "NIST SP 800-38D",
    "NIST SP 800-56A Rev. 2 [Superseded]; NIST SP 800-56B Rev. 1 [Superseded]",
    "NIST SP 800-208",
    "NIST CSRC Glossary"
  ],
  "url": "https://mlchart.com/terminology/cybersecurity/h-term/"
}