> ## Documentation Index
> Fetch the complete documentation index at: https://docs.neuro-tech.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Cryptographic keys

> Key IDs, key signatures, and request signatures

## Overview

Some cryptographic and legal endpoints require two signatures:

* **Key signature**: proves knowledge of the key password.
* **Request signature**: proves knowledge of the account password.

This protects both the stored key material and the API request.

## Key IDs

Key IDs are unique per account. Different accounts can reuse the same key ID
without conflict.

## Key signature

The key signature is typically an HMAC over the key ID using the key password as
the key. It is never sent in plaintext.

## Request signature

The request signature is an HMAC over the request payload using the account
password as the key, often combined with a nonce.

## Related endpoints

* [Create key](/manual-api-reference/crypto/create-key)
* [Get public key](/manual-api-reference/crypto/get-public-key)