{
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  "lastModified": "2026-10-15T16:41:06.490Z",
  "sourcePath": "src/main/data/docs",
  "docId": "RFC4757",
  "document": {
    "abstract": "The Microsoft Windows 2000 implementation of Kerberos introduces a new encryption type based on the RC4 encryption algorithm and using an MD5 HMAC for checksum. This is offered as an alternative to using the existing DES-based encryption types. The RC4-HMAC encryption types are used to ease upgrade of existing Windows NT environments, provide strong cryptography (128-bit key lengths), and provide exportable (meet United States government export restriction requirements) encryption. This document describes the implementation of those encryption types. This memo provides information for the Internet community.",
    "abstract$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML abstract",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
      "updated": "2026-10-14T18:50:42.775Z",
      "version": "extractDocs.js@commit:673dd514c094"
    },
    "authors": [
      {
        "name": "Karthik Jaganathan"
      },
      {
        "name": "Larry Zhu"
      },
      {
        "name": "John Brezak"
      }
    ],
    "authors$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/rfc4757/",
      "updated": "2026-10-14T18:50:42.775Z",
      "version": "extractDocs.js@commit:673dd514c094"
    },
    "docId": "RFC4757",
    "docId$meta": {
      "confidence": "high",
      "note": "Derived from RFC number or Datatracker identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
      "updated": "2026-10-14T18:50:42.775Z",
      "version": "extractDocs.js@commit:673dd514c094"
    },
    "docLabel": "IETF RFC 4757",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
      "updated": "2026-10-14T18:50:42.775Z",
      "version": "extractDocs.js@commit:673dd514c094"
    },
    "docNumber": "4757",
    "docNumber$meta": {
      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
      "updated": "2026-10-14T18:50:42.775Z",
      "version": "extractDocs.js@commit:673dd514c094"
    },
    "docTitle": "The RC4-HMAC Kerberos Encryption Types Used by Microsoft Windows",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
      "updated": "2026-10-14T18:50:42.775Z",
      "version": "extractDocs.js@commit:673dd514c094"
    },
    "docType": "Specification",
    "docType$meta": {
      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
      "updated": "2026-10-14T18:50:42.775Z",
      "version": "extractDocs.js@commit:673dd514c094"
    },
    "doi": "10.17487/RFC4757",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
      "updated": "2026-10-14T18:50:42.775Z",
      "version": "extractDocs.js@commit:673dd514c094"
    },
    "href": "https://doi.org/10.17487/RFC4757",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
      "updated": "2026-10-14T18:50:42.775Z",
      "version": "extractDocs.js@commit:673dd514c094"
    },
    "keywords": [
      "HMAC-MD5"
    ],
    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
      "originalValue": [
        "Md5 Hmac"
      ],
      "overridden": true,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
      "updated": "2026-10-15T16:41:06.490Z",
      "version": "extractDocs.js@commit:0f51bb226575"
    },
    "pages": "18",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
      "updated": "2026-10-14T18:50:42.775Z",
      "version": "extractDocs.js@commit:673dd514c094"
    },
    "publicationDate": "2006-12-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
      "updated": "2026-10-14T18:50:42.775Z",
      "version": "extractDocs.js@commit:673dd514c094"
    },
    "publisher": "IETF",
    "publisher$meta": {
      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
      "updated": "2026-10-14T18:50:42.775Z",
      "version": "extractDocs.js@commit:673dd514c094"
    },
    "references": {
      "bibliographic": [
        "orphan/RFC4757/h:40b18247",
        "orphan/RFC4757/h:7f6f8555",
        "orphan/RFC4757/h:c463b3f4",
        "orphan/RFC4757/h:01228062",
        "orphan/RFC4757/h:484eb5e0"
      ],
      "bibliographic$meta": {
        "confidence": "medium",
        "note": "Citations without a standard ID, kept as MRI orphan refs (or resolved once the reference label was stripped)",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
        "updated": "2026-10-14T18:52:10.696Z",
        "version": "extractDocs.js@commit:673dd514c094"
      },
      "normative": [
        "RFC1320",
        "RFC1321",
        "RFC1964",
        "RFC2104",
        "RFC2119",
        "RFC3961",
        "RFC3962",
        "RFC4120",
        "RFC4537"
      ],
      "normative$meta": {
        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
        "updated": "2026-10-14T18:50:42.775Z",
        "version": "extractDocs.js@commit:673dd514c094"
      }
    },
    "resolvedHref": "https://www.rfc-editor.org/info/rfc4757/",
    "resolvedHref$meta": {
      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
      "updated": "2026-10-14T18:50:42.775Z",
      "version": "extractDocs.js@commit:673dd514c094"
    },
    "status": {
      "active": true,
      "active$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
        "updated": "2026-10-14T18:50:42.775Z",
        "version": "extractDocs.js@commit:673dd514c094"
      },
      "amendedBy": [
        "RFC6649"
      ],
      "amendedBy$meta": {
        "confidence": "high",
        "note": "Parsed from RFC index XML",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
        "updated": "2026-10-14T18:50:42.775Z",
        "version": "extractDocs.js@commit:673dd514c094"
      },
      "errataExist": true,
      "errataExist$meta": {
        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
        "updated": "2026-10-14T18:50:42.775Z",
        "version": "extractDocs.js@commit:673dd514c094"
      },
      "errataUrl": [
        "https://www.rfc-editor.org/errata/rfc4757",
        "https://www.rfc-editor.org/errata_search.php?rfc=4757",
        "https://www.rfc-editor.org/rfc/inline-errata/rfc4757.html"
      ],
      "errataUrl$meta": {
        "confidence": "high",
        "note": "Parsed from errata links on RFC/Datatracker pages",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
        "updated": "2026-10-14T18:50:42.775Z",
        "version": "extractDocs.js@commit:673dd514c094"
      },
      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
        "updated": "2026-10-14T18:50:42.775Z",
        "version": "extractDocs.js@commit:673dd514c094"
      },
      "statusNote": "Historic",
      "statusNote$meta": {
        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
        "updated": "2026-10-14T18:50:42.775Z",
        "version": "extractDocs.js@commit:673dd514c094"
      },
      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4757/",
        "updated": "2026-10-14T18:50:42.775Z",
        "version": "extractDocs.js@commit:673dd514c094"
      }
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}