---
title: cf.tls_ciphers_sha1 · Cloudflare Ruleset Engine docs
description: The SHA-1 fingerprint of the client TLS cipher list in received
  order, encoded in Base64 using big-endian format.
chatbotDeprioritize: false
source_url:
  html: https://developers.cloudflare.com/ruleset-engine/rules-language/fields/reference/cf.tls_ciphers_sha1/
  md: https://developers.cloudflare.com/ruleset-engine/rules-language/fields/reference/cf.tls_ciphers_sha1/index.md
---

# cf.tls\_ciphers\_sha1

`cf.tls_ciphers_sha1` String

The SHA-1 fingerprint of the client TLS cipher list in received order, encoded in Base64 using big-endian format.

Example value:

```txt
"GXSPDLP4G3X+prK73a4wBuOaHRc="
```

Categories:

* Request
* SSL/TLS
