Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
I would like to know if it is possible to add custom data to TLS certificate? Let’s say I want to create a new CNAME blog.sridharg.org and have a TLS certificate issued by letsencrypt. Is it possible to include custom data to the certificate that also gets signed by letsencrypt? Or will letsencrypt filter out any custom data?
My question was not just about enabling TLS for blog.sridharg.org, but about issuing a new certificate to blog.sridharg.org and adding custom data in that certificate. Is it possible?
Extending @danb35’s response, whatever things you entered in the CSR, it will be filtered out… (Except subject alternative name aka SAN)
The only way to include more data is to purchase an higher level certificate, which will include some extra information (e.g. city, state, business name / person name, addresses…)