CIPHERS.md: Mention the options used to set TLS 1.3 ciphers

# Ciphers

# Ciphers

With curl's options `CURLOPT_SSL_CIPHER_LIST` and `--ciphers` users can

With curl's options

control which ciphers to consider when negotiating TLS connections.

[`CURLOPT_SSL_CIPHER_LIST`](https://curl.haxx.se/libcurl/c/CURLOPT_SSL_CIPHER_LIST.html)

and

[`--ciphers`](https://curl.haxx.se/docs/manpage.html#--ciphers)

users can control which ciphers to consider when negotiating TLS connections.

TLS 1.3 ciphers are supported since curl 7.61 with options

[`CURLOPT_TLS13_CIPHERS`](https://curl.haxx.se/libcurl/c/CURLOPT_TLS13_CIPHERS.html)

and

[`--tls13-ciphers`](https://curl.haxx.se/docs/manpage.html#--tls13-ciphers)

.

The names of the known ciphers differ depending on which TLS backend that

The names of the known ciphers differ depending on which TLS backend that

libcurl was built to use. This is an attempt to list known cipher names.

libcurl was built to use. This is an attempt to list known cipher names.

### TLS 1.3 cipher suites

### TLS 1.3 cipher suites

(Note: the TLS 1.3 cipher suites are set with a separate option.)

(Note these ciphers are set with `CURLOPT_TLS13_CIPHERS` and `--tls13-ciphers`)

`TLS13-AES-256-GCM-SHA384`

`TLS13-AES-256-GCM-SHA384`

`TLS13-CHACHA20-POLY1305-SHA256`

`TLS13-CHACHA20-POLY1305-SHA256`