Customize cipher suites
With Advanced Certificate Manager or within SSL for SaaS, you can restrict connections between Cloudflare and clients - such as your visitor’s browser - to specific cipher suites.
This process will not lead to any downtime in your SSL/TLS protection.
Currently, you can only customize cipher suites when using the API:
When you customize cipher suites for a zone, the restriction affects all hostnames within the zone.
Cipher suite values
TLS 1.2 or lower
To specify certain cipher suites, include an array of applicable cipher suites used for TLS 1.2 or lower in the
value field. Cloudflare offers a list of recommended ciphers by security requirements, but you can also refer to the full list of supported ciphers.
You cannot set specific TLS 1.3 ciphers.
Instead, you will need to enable TLS 1.3 for your entire domain and Cloudflare will use all applicable TLS 1.3 cipher suites.
In combination with this, you can still restrict specific ciphers for TLS 1.0-1.2.
Reset to default values
To reset to the default cipher suites, send an empty array in the