---
title: "About generation of serial numbers - Amplia"
description: "How Amplia generates certificate serial numbers: random values of 16-17 bytes with 122 bits of entropy, and the option for CA certificates."
canonical: "https://docs.lacunasoftware.com/en-us/articles/amplia/about/serial-number-generation"
locale: "en"
product: "Amplia"
last_updated: "2026-10-12"
---

# About generation of serial numbers - Amplia

End-user certificates issued by [Amplia](https://docs.lacunasoftware.com/en-us/articles/amplia) have a random serial number. By default, CA certificates have a
sequential serial number, but if you have an [on-premises instance](https://docs.lacunasoftware.com/en-us/articles/amplia/on-premises) you can configure your instance
to also issue CA certificates with random serial numbers (see [configure CA certificate templates](https://docs.lacunasoftware.com/en-us/articles/amplia/on-premises/configure-ca-cert-templates) for instructions).

## Length and entropy

The random serial numbers generated by Amplia consist of 16-17 bytes generated with a pseudo-random
number generator (CSPRNG) having 122 bits of strong entropy.

Examples:

```text
0x33465bdd6636854a842dbee1085c352e
0x00cca41bb584e3c94cb32779d845ec0642
```