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edit ## Adding an identity component

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book/source/17-zoom_certificates.md
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(zooming_in_user_id)=
## Adding an identity component
Now we'll look at an identity that is associated with Alice's certificate.
In this section, we'll look at an identity associated with Alice's certificate.
User IDs are a mechanism for connecting [identities](identity_components) with an OpenPGP certificate. Traditionally, User IDs contain a string that combines a name and an email address.
User IDs are a mechanism for connecting [identities](identity_components) with an OpenPGP certificate. Typically, a User ID is a string combining a name and an email address.
Like [above](zoom_enc_subkey), to look at the internal packet structure of this identity and its connection the OpenPGP certificate, we'll inspect the two individual packets that constitute the identity component, the [User ID packet](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-10.html#name-user-id-packet-tag-13), in the file `alice.pub-2--UserID`, and the certifying self-signature a [Positive certification of a User ID and Public-Key packet](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-10.html#name-positive-certification-of-a) in `alice.pub-3--Signature` (these packets are an excerpt of Alice's full OpenPGP private key).
To understand the internal packet structure of this identity and its connection to the OpenPGP certificate, we'll examine two packets that constitute the identity component. One is the [User ID packet](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-10.html#name-user-id-packet-tag-13), located in the file `alice.pub-2--UserID`, which contains identity information. The other is a certifying self-signature, specifically a [Positive certification of a User ID and Public-Key packet](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-10.html#name-positive-certification-of-a) located in the file `alice.pub-3--Signature`. This certification, issued after substantial verification of the identity claim, validates the association between the User ID and the certificate's public key. These packets are snippets from Alice's full OpenPGP private key.
### User ID packet