{
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  "docId": "RFC4226",
  "document": {
    "abstract": "This document describes an algorithm to generate one-time password values, based on Hashed Message Authentication Code (HMAC). A security analysis of the algorithm is presented, and important parameters related to the secure deployment of the algorithm are discussed. The proposed algorithm can be used across a wide range of network applications ranging from remote Virtual Private Network (VPN) access, Wi-Fi network logon to transaction-oriented Web applications. This work is a joint effort by the OATH (Open AuTHentication) membership to specify an algorithm that can be freely distributed to the technical community. The authors believe that a common and shared algorithm will facilitate adoption of two-factor authentication on the Internet by enabling interoperability across commercial and open-source implementations. This memo provides information for the Internet community.",
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      "confidence": "high",
      "note": "Parsed from RFC index XML abstract",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
      "updated": "2026-10-16T15:45:26.828Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "authors": [
      {
        "name": "David M'Raihi"
      },
      {
        "name": "Mihir Bellare"
      },
      {
        "name": "Frank Hoornaert"
      },
      {
        "name": "David Naccache"
      },
      {
        "name": "Ohad Ranen"
      }
    ],
    "authors$meta": {
      "confidence": "high",
      "note": "Parsed from Datatracker doc page article:author (profile full names)",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
      "updated": "2026-10-16T15:45:26.828Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "docId": "RFC4226",
    "docId$meta": {
      "confidence": "high",
      "note": "Derived from RFC number or Datatracker identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
      "updated": "2026-10-16T15:45:26.828Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "docLabel": "IETF RFC 4226",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
      "updated": "2026-10-16T15:45:26.828Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
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    "docNumber": "4226",
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      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
      "updated": "2026-10-16T15:45:26.828Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "docTitle": "HOTP: An HMAC-Based One-Time Password Algorithm",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
      "updated": "2026-10-16T15:45:26.828Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "docType": "Informational",
    "docType$meta": {
      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
      "updated": "2026-10-16T15:45:26.828Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "doi": "10.17487/RFC4226",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
      "updated": "2026-10-16T15:45:26.828Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "href": "https://doi.org/10.17487/RFC4226",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
      "updated": "2026-10-16T15:45:26.828Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "keywords": [
      "HMAC",
      "OATH",
      "Open Authentication",
      "Authentication"
    ],
    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
      "originalValue": [
        "HMAC",
        "Security Analysis",
        "OATH",
        "Open Authentication",
        "Authentication"
      ],
      "overridden": true,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
      "updated": "2026-10-16T16:57:31.686Z",
      "version": "extractDocs.js@commit:30d92d8ed083"
    },
    "pages": "37",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
      "updated": "2026-10-16T15:45:26.828Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "publicationDate": "2005-12-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
      "updated": "2026-10-16T15:45:26.828Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "publisher": "IETF",
    "publisher$meta": {
      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
      "updated": "2026-10-16T15:45:26.828Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "references": {
      "bibliographic": [
        "10.5555-646760.705865",
        "orphan/RFC4226/h:0677fcaa",
        "orphan/RFC4226/h:d0a435cb",
        "orphan/RFC4226/h:7f1200e7",
        "orphan/RFC4226/h:dde15ea2",
        "orphan/RFC4226/h:6d45357d"
      ],
      "bibliographic$meta": {
        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=11 proseBlocks=15 skippedAnchorBlocks=13",
        "note": "Parsed from RFC HTML references/informative sections",
        "originalValue": [],
        "reviewRequired": true,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
        "updated": "2026-10-16T15:45:26.828Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "normative": [
        "10.5555-646761.706031",
        "RFC2104",
        "RFC2119",
        "RFC3979",
        "RFC4086"
      ],
      "normative$meta": {
        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
        "updated": "2026-10-16T15:45:26.828Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      }
    },
    "resolvedHref": "https://www.rfc-editor.org/info/rfc4226/",
    "resolvedHref$meta": {
      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
      "updated": "2026-10-16T15:45:26.828Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
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      "active": true,
      "active$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
        "updated": "2026-10-16T15:45:26.828Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "errataExist": true,
      "errataExist$meta": {
        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
        "updated": "2026-10-16T15:45:26.828Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "errataUrl": [
        "https://www.rfc-editor.org/errata/rfc4226",
        "https://www.rfc-editor.org/errata_search.php?rfc=4226",
        "https://www.rfc-editor.org/rfc/inline-errata/rfc4226.html"
      ],
      "errataUrl$meta": {
        "confidence": "high",
        "note": "Parsed from errata links on RFC/Datatracker pages",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
        "updated": "2026-10-16T15:45:26.828Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
        "updated": "2026-10-16T15:45:26.828Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "statusNote": "Informational",
      "statusNote$meta": {
        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
        "updated": "2026-10-16T15:45:26.828Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4226/",
        "updated": "2026-10-16T15:45:26.828Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
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}