# Jael Jael is Arvo's module for networking key infrastructure. The main purpose of Jael is keeping track of [Azimuth](/urbit-id/what-is-urbit-id.md)-related information. This includes: * Every known Urbit ship's public keys. * Every known Urbit ship's [key revision number and continuity breach number](/urbit-id/life-and-rift.md). * Every known Urbit ship's sponsor. It also handles the local ship's private keys, keeps track of galaxy domain prexifes, and performs some tasks related to booting the local ship for the first time. The database of PKI information that Jael maintains is used by other modules and applications for identity validation, encryption, decryption, and other cryptographic functions. In particular, [Ames](/urbit-os/kernel/ames.md) uses the information stored in Jael to encrypt packets it sends to other ships, and to decrypt and validate packets it receives from them. Jael has a few tasks you can use to interact with it. In particular, its [`%public-keys` task](/urbit-os/kernel/jael/tasks.md#public-keys) allows an application or thread to subscribe for PKI updates for a set of ships. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.urbit.org/urbit-os/kernel/jael.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.