Information Security Models |link| Jun 2026

Time of day, current location, or device security posture. Comparison of Core Models Primary Focus Bell-LaPadula Confidentiality No Read Up Military/Government Biba No Write Up Research/Data Quality Clark-Wilson Separation of Duties Finance/Banking Brewer-Nash Anti-Conflict Dynamic Access Law/Consulting Zero Trust Verification Trust Nothing Cloud/Hybrid Work

As we enter the era of quantum computing, zero-trust architectures, and AI-driven systems, these foundational models will inevitably evolve. But their core questions— Who can read this? Who can change that? Under what conditions? —will remain the eternal blueprint of digital defense. information security models

Users can only change data through specific, audited programs. Time of day, current location, or device security posture

Created in the 1970s, this is the gold standard for confidentiality. It uses a multilevel security approach with two core rules: Time of day