4.5 Security Considerations
Outlines the layered identity-confirmation firewalls required for computer access, from voiceprint matching up to DNA and neuronal matching, the restrictions on physical access to computer hardware, the monitoring of isolinear circuitry junctions against sabotage, and the logging and analysis of security incidents to maintain manageable computer security.
Access to the computer system requires clearance through a series of identity confirmation firewall layers, beginning with voiceprint matching. Depending on the clearance level, additional confirmation methods involve physiognomy recognition, iris and retinal pattern matching, integumentary surface matching, and in the highest-level clearance, DNA and neuronal structural matching. Additional firewall layers are structured specifically for non-user-specific file transfers and program execution. A combination of Bajoran and Starfleet command personnel aboard the station have the authority to set user permissions, passwords, and clearance levels.
Physical access to computer hardware such as the computer cores and data pathway circuitry is nominally restricted to command and engineering personnel. Access codes and special tools are required for most tasks involving hardware repairs and installation. During heightened alert levels, all inbound and outbound equipment must be scanned and recorded at sensitive areas. Circuitry junctions using isolinear devices are key targets for threat-force sabotage and are regularly monitored (see illustration).
All security incidents involving Deep Space 9 computer systems have been logged and analyzed and have shown that many firewall schemes can be defeated. Continued vigilance and upgraded security methodology have also shown that most local and system-wide breaches have been traced and the perpetrators discovered. Frequent access key code changes and random clearance testing have been credited with maintaining a manageable level of computer-security.