BVR, BRM, BAM and BSM come with default truststores which includes a long list of trusted certificate authorities. However, it is likely that you will need to add your own Certificate Authorities to this file in order for BVR to trust other systems - for example, systems on your private network, which would not have their certificates signed by a publicly accessible Certificate Authority.
-----BEGIN CERTIFICATE----- -----END CERTIFICATE-----
Information on Certificate Authorities can be found here https://en.wikipedia.org/wiki/Certificate_authority
For further information on the bvr_keytool command, please refer to the Oracle keytool documentation. https://docs.oracle.com/javase/8/docs/technotes/tools/unix/keytool.html