Digital Certificates are files that bind a specific public key together with other information, to an individual or organisation. The S-63 standard uses a 2-level chain of certificates to operate the data protection scheme.
The IHB operates as the Scheme Administrator (SA) and has issued the root Digital Certificate for use within the protection scheme. The SA certificate used by IHB is a self-signed certificate. It is available both as a X-509 compliant file IHO.CRT and as a text file (Scheme Administrator Public Key.txt). Both files are contained in an SA Certificate compressed file that can be downloaded HERE.

The S-63 protection scheme requires the SA public key to be installed on end user systems by all users of the protection scheme.  The installation of the SA certificate (and the public key held within) should be carried out as a separate, independent operation and should be subject to carefully controlled operating procedures.