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jwt-attr-cert-id.lyx
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jwt-attr-cert-id.lyx
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\begin_layout Title
JWT Attribute Certificate (JAC)
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draft-howard-jwt-attr-cert-01.txt
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JWT Attribute Certificate (JAC)
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Security Area
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\begin_layout Author
Luke Howard
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PADL Software
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PADL
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L.
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Howard
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PO Box 59
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Central Park
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VIC
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Australia
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3145
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\begin_layout Abstract
A JSON Web Token Attribute Certificate (JAC) contains additional claims,
grouped by scope, to be presented alongside a primary JSON Web Token.
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\begin_layout Section
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Introduction
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JSON Web Tokens (JWTs, defined in
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I-D.ietf-oauth-json-web-token
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) may be used to convey certified claims about a subject.
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BrowserID
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protocol uses a JWT containing an e-mail address and public key to bind
an identity to a signing key.
JWTs may include a variety of claims, however doing so in a single token
has some disadvantages.
First, all claims must be issued by the same entity (or the issuer must
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Secondly, they must share the same validity period.
Finally, the disclosing party must either reveal all claims or none.
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Attribute certificates (similar to those described in
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) allow additional claims, grouped by scope, to be disclosed separately.
A special claim is used to bind the attribute certificate to the primary
JWT with which it is associated.
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\begin_layout Standard
This document defines procedures and conventions for using a JWT as an attribute
certificate.
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Requirements notation
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The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD",
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to be interpreted as described in
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RFC2119
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.
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\begin_layout Standard
The reader is assumed to be familiar with the terms used in the base JWT
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Terminology
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\begin_layout Description
Certificate
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Digest
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Information a claim binding a JAC to its Primary JWT
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\begin_layout Description
Claims individual properties in a JAC or other JWT
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\begin_layout Description
JAC
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Validity the time interval in which the JAC is valid, as expressed by the
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nbf
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(
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I-D.ietf-oauth-json-web-token
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Section 4.1.5) and
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exp
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(
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I-D.ietf-oauth-json-web-token
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Section 4.1.4) claims
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\begin_layout Description
JWT
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Attribute
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Certificate
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(JAC) a JWT associated with a Primary JWT that containing additional claims
about a subject
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\begin_layout Description
JSON
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Web
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Token
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(JWT) a signed or encrypted structure for representing a set of Claims to
be transferred between two parties
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Primary
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JWT a JWT certifying an identity and typically containing a public key
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Scope a string that identifies the set of claims in a JAC
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Scope
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JWT Attribute Certificate (JAC) Overview
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A JWT Attribute Certificate is a JSON Web Token (per
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Section 3) that contains the mandatory claims defined in
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and is associated with another JWT (the Primary JWT).
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Example JAC
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The following is an example of a JAC Claims Set containing a end-user's
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{
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"scope": "profile",
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"scope_description": "My standard profile",
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"cdi": {
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"alg": "S256",
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"dig": "fHf5HxJuzWTSuepVY3N0BvWlvuXPNiUHwqsk0HX1Cjc"
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},
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"iss": "ca.example.com",
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"name": "Luke Howard",
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"given_name": "Luke",
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"family_name": "Howard",
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"website": "www.example.com/~lukeh",
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"preferred_username": "lukeh"
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The Claims Set is signed (in this case, by a key belonging to
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ca.example.com
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) and encoded as a JWT; this encoding is the JAC.
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JAC Claims
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The following Claim Names are defined for use in JACs.
JACs MAY contain other claims.
Claims present in the Primary JWT, with the exception of
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iss
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,
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aud
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,
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exp
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,
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,
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iat
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and
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jti
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, SHOULD NOT be present in a JAC.
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\begin_layout Subsection
\begin_inset CommandInset label
LatexCommand label
name "sub:cbi-claim"
\end_inset
\begin_inset Quotes eld
\end_inset
cdi
\begin_inset Quotes erd
\end_inset
(Certificate Digest Information)
\end_layout
\begin_layout Standard
The
\begin_inset Quotes eld
\end_inset
cdi
\begin_inset Quotes erd
\end_inset
claim binds a JAC to its Primary JWT.
Its value is a JSON object containing the name/value pairs (sub-claims)
defined below.
Use of this claim is REQUIRED.
\end_layout
\begin_layout Standard
(Note that the term
\begin_inset Quotes eld
\end_inset
certificate
\begin_inset Quotes erd
\end_inset
is used for consistency with
\begin_inset Flex EntityXRef
status collapsed
\begin_layout Plain Layout
RFC5755
\end_layout
\end_inset
; however there is no explicit requirement that the Primary JWT contain
a public key or otherwise function as a certificate.)
\end_layout
\begin_layout Subsubsection
\begin_inset CommandInset label
LatexCommand label
name "sub:alg-subclaim"
\end_inset
\begin_inset Quotes eld
\end_inset