{
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    "abstract": "The Secure Shell (SSH) Protocol is a protocol for secure remote login and other secure network services over an insecure network. This document describes the architecture of the SSH protocol, as well as the notation and terminology used in SSH protocol documents. It also discusses the SSH algorithm naming system that allows local extensions. The SSH protocol consists of three major components: The Transport Layer Protocol provides server authentication, confidentiality, and integrity with perfect forward secrecy. The User Authentication Protocol authenticates the client to the server. The Connection Protocol multiplexes the encrypted tunnel into several logical channels. Details of these protocols are described in separate documents. [STANDARDS-TRACK]",
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    },
    "authors": [
      {
        "name": "Tatu Ylonen"
      },
      {
        "name": "Chris M. Lonvick"
      }
    ],
    "authors$meta": {
      "confidence": "high",
      "note": "Parsed from Datatracker doc page article:author (profile full names)",
      "originalValue": null,
      "source": "parsed",
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      "updated": "2026-10-08T23:05:18.496Z",
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    "docId": "RFC4251",
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      "confidence": "high",
      "note": "Derived from RFC number or Datatracker identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
      "updated": "2026-10-08T23:05:18.496Z",
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    "docLabel": "IETF RFC 4251",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
      "updated": "2026-10-08T23:05:18.496Z",
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    "docNumber": "4251",
    "docNumber$meta": {
      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
      "updated": "2026-10-08T23:05:18.496Z",
      "version": "extractDocs.js@commit:e421a1aa72eb"
    },
    "docTitle": "The Secure Shell (SSH) Protocol Architecture",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
      "updated": "2026-10-08T23:05:18.496Z",
      "version": "extractDocs.js@commit:e421a1aa72eb"
    },
    "docType": "Standard",
    "docType$meta": {
      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
      "updated": "2026-10-08T23:05:18.496Z",
      "version": "extractDocs.js@commit:e421a1aa72eb"
    },
    "doi": "10.17487/RFC4251",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
      "updated": "2026-10-08T23:05:18.496Z",
      "version": "extractDocs.js@commit:e421a1aa72eb"
    },
    "href": "https://doi.org/10.17487/RFC4251",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
      "updated": "2026-10-08T23:05:18.496Z",
      "version": "extractDocs.js@commit:e421a1aa72eb"
    },
    "keywords": [
      "Remote Login",
      "SSH"
    ],
    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
      "originalValue": [
        "Remote Login",
        "Ssh Algorithm"
      ],
      "overridden": true,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
      "updated": "2026-10-08T23:23:43.522Z",
      "version": "extractDocs.js@commit:431913ef390e"
    },
    "pages": "30",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
      "updated": "2026-10-08T23:05:18.496Z",
      "version": "extractDocs.js@commit:e421a1aa72eb"
    },
    "publicationDate": "2006-01-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
      "updated": "2026-10-08T23:05:18.496Z",
      "version": "extractDocs.js@commit:e421a1aa72eb"
    },
    "publisher": "IETF",
    "publisher$meta": {
      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
      "updated": "2026-10-08T23:05:18.496Z",
      "version": "extractDocs.js@commit:e421a1aa72eb"
    },
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      "bibliographic": [
        "RFC822",
        "RFC854",
        "RFC1034",
        "RFC1282",
        "RFC4120",
        "RFC1964",
        "RFC2025",
        "RFC2085",
        "RFC2104",
        "RFC2246",
        "RFC2410",
        "RFC2743",
        "RFC3766",
        "RFC4086",
        "NIST.FIPS.180-2",
        "NIST.FIPS.186",
        "NIST.FIPS.197",
        "ANSI.T1.523.2001",
        "ISBN.9780471117094",
        "ISBN.1555580882",
        "IETF.draft-rogaway-ipsec-comments-00",
        "orphan/RFC4251/h:572bb5e2",
        "orphan/RFC4251/h:9975d47c",
        "orphan/RFC4251/h:c7536675",
        "orphan/RFC4251/h:5054efa2",
        "orphan/RFC4251/h:8ad4a4d8",
        "orphan/RFC4251/h:15f5ba14",
        "orphan/RFC4251/h:486f9bb4"
      ],
      "bibliographic$meta": {
        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=36 proseBlocks=41 skippedAnchorBlocks=39",
        "note": "Parsed from RFC HTML references/informative sections",
        "originalValue": [
          "RFC822",
          "RFC854",
          "RFC1034",
          "RFC1282",
          "RFC4120",
          "RFC1964",
          "RFC2025",
          "RFC2085",
          "RFC2104",
          "RFC2246",
          "RFC2410",
          "RFC2743",
          "RFC3766",
          "RFC4086",
          "NIST.FIPS.180-2",
          "NIST.FIPS.186-2",
          "NIST.FIPS.197",
          "ANSI.T1.523.2001",
          "ISBN.9780471117094",
          "ISBN.1555580882",
          "IETF.draft-rogaway-ipsec-comments-00",
          "orphan/RFC4251/h:572bb5e2",
          "orphan/RFC4251/h:9975d47c",
          "orphan/RFC4251/h:c7536675",
          "orphan/RFC4251/h:5054efa2",
          "orphan/RFC4251/h:8ad4a4d8",
          "orphan/RFC4251/h:15f5ba14",
          "orphan/RFC4251/h:486f9bb4"
        ],
        "overridden": true,
        "reviewRequired": true,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
        "updated": "2026-10-09T21:03:50.268Z",
        "version": "extractDocs.js@commit:01cb8ce286c5"
      },
      "normative": [
        "RFC4253",
        "RFC4252",
        "RFC4254",
        "RFC4250",
        "RFC2119",
        "RFC2434",
        "RFC3066",
        "RFC3629"
      ],
      "normative$meta": {
        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
        "updated": "2026-10-08T23:05:18.497Z",
        "version": "extractDocs.js@commit:e421a1aa72eb"
      }
    },
    "resolvedHref": "https://www.rfc-editor.org/info/rfc4251/",
    "resolvedHref$meta": {
      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
      "updated": "2026-10-08T23:05:18.496Z",
      "version": "extractDocs.js@commit:e421a1aa72eb"
    },
    "status": {
      "active": true,
      "active$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
        "updated": "2026-10-08T23:05:18.496Z",
        "version": "extractDocs.js@commit:e421a1aa72eb"
      },
      "amendedBy": [
        "RFC8308",
        "RFC9141"
      ],
      "amendedBy$meta": {
        "confidence": "high",
        "note": "Parsed from RFC index XML",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
        "updated": "2026-10-08T23:05:18.497Z",
        "version": "extractDocs.js@commit:e421a1aa72eb"
      },
      "errataExist": false,
      "errataExist$meta": {
        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
        "updated": "2026-10-08T23:05:18.496Z",
        "version": "extractDocs.js@commit:e421a1aa72eb"
      },
      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
        "updated": "2026-10-08T23:05:18.496Z",
        "version": "extractDocs.js@commit:e421a1aa72eb"
      },
      "statusNote": "Proposed Standard",
      "statusNote$meta": {
        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
        "updated": "2026-10-08T23:05:18.496Z",
        "version": "extractDocs.js@commit:e421a1aa72eb"
      },
      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4251/",
        "updated": "2026-10-08T23:05:18.496Z",
        "version": "extractDocs.js@commit:e421a1aa72eb"
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}