What is a Certificate Authority (CA) bundle?

A Certificate Authority (CA) bundle is a file that contains the following details about the SSL certificate:

  • Who issued it.
  • Any certificates of the authority that issued it.
  • The “chain of trust” for the issuer. Note: A certificate authority can vouch for other certificate authorities, which results in a “chain of trust.” In order for a certificate authority to sell certificates, another certificate authority must vouch for them.
  • Certificate revocation lists (CRLs).

Web browsers have a built-in list of trusted certificate authorities, and they use the list to determine whether to trust an authority.

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