  This paper mainly depicts the conceptual overview of vertical integration,
semantic interoperability architecture such as Educational Sector Architectural
Framework (ESAF) for New Zealand government and different interoperability
framework solution for digital government. In this paper, we try to develop a
secure information sharing approach for digital government to improve home land
security. This approach is a role and cooperation based approach for security
personnel of different government departments. In order to run any successful
digital government of any country in the world, it is necessary to interact
with their citizen and to share secure information via different network among
the citizen or other government. Consequently, in order to smooth the progress
of users to cooperate with and share information without darkness and
flawlessly transversely different networks and databases universally, a safe
and trusted information-sharing environment has been renowned as a very
important requirement and to press forward homeland security endeavor. The key
incentive following this research is to put up a secure and trusted
information-sharing approach for government departments. This paper presents a
proficient function and teamwork based information sharing approach for safe
exchange of hush-hush and privileged information amid security personnels and
government departments inside the national boundaries by means of public key
cryptography. The expanded approach makes use of cryptographic hash function;
public key cryptosystem and a unique and complex mapping function for securely
swapping over secret information. Moreover, the projected approach facilitates
privacy preserving information sharing with probable restrictions based on the
rank of the security personnels.
