Romulan Central Information Net

The Romulan Central Information Net was the primary database system employed by the Romulan Star Empire. (TOS novel: Captain's Blood)

Access to the Information Net was high restricted and protected by a progressive encryption lock featuring a forty-three part cypher key which made it difficult for enemies to enter into. The Klingon Empire made numerous attempts at penetrating the Information Net but were unsuccessful.

Lieutenant Commander Data managed to gain access to the Central Information Net in 2368 with the aid of Ambassador Spock which allowed them access to both the central database itself and the Romulan Proconsuls personal files. (TNG episode: Unification II)