Use robust security certificates
You must obtain a security certificate as a part of enabling HTTPS for your site. The certificate is issued by a certificate authority (CA), which takes steps to verify that your web address actually belongs to your organization, thus protecting your customers from man-in-the-middle attacks. When setting up your certificate, ensure a high level of security by choosing a 2048-bit key. If you already have a certificate with a weaker key (1024-bit), upgrade it to 2048 bits.
When choosing your site certificate, keep in mind the following:
- Get your certificate from a reliable CA that offers technical support.
- Decide the kind of certificate you need:
- Single certificate for single secure origin (e.g. www.example.com).
- Multi-domain certificate for multiple well-known secure origins (e.g. www.example.com, cdn.example.com, example.co.uk).
- Wildcard certificate for a secure origin with many dynamic subdomains (e.g. a.example.com, b.example.com).