Choosing

Digi-CA™: The simplicity of the design of the complete Digi-CA™ system means that the same system can be purchased initially as a service [1]. Later, if needed, the software [2] version can be deployed and later scaled for enterprise, large scale and even national PKI use, with minimum or no disruption. This is made possible by the modular architecture used in the development of the Digi-CA™ system.
Modular Architecture: The modular architecture of Digi-CA™ provides its components in Service Modules [1]. Here is the list of modules currently available (for further details, refer to the Digi-CA™ Deployment Guide).
Deployment Models

Module Name	Code	Services Provided

Cryptographic Service Provider	CSP	Certificate & CRL Generation Services
Time-Stamping Gateway	TSG	Digital Time-Stamping Service
OCSP Gateway	OCSPG	Real time Revocation Status Service
CA Application Service	CAAS	TSG and OCSPG gateway services connector
CA Management Console	CAMC	Web based Certification Authority management
RA Management Console	RAMC	Web based Registration Authority management
Entity Registration Service	ERS	Web based End Entity Registration management
Content Dissemination Service	CDS	Certificate and CRL dissemination management