The assumption that “inside the corporate network is safe” no longer holds. Zero Trust is a design philosophy, not a product — here are the fundamentals and a realistic first step.
The limits of perimeter defense
Corporate networks were traditionally protected like a castle and moat: everything inside the firewall was trusted, and once a user entered via VPN, they were granted broad access.
But with SaaS adoption and remote work, both the data and the users now live outside the moat. Worse, once an attacker gets in, the trusted internal network makes lateral movement — and large-scale damage — structurally easy.
The three principles of Zero Trust
Zero Trust is not pessimism (“trust nothing”) but a set of design principles: verify trust continuously. Three ideas sit at the core.
- Verify explicitly — evaluate the user, device, location and request on every connection
- Least privilege — grant only the access a task requires, only for as long as it is needed
- Assume breach — design so that when something is compromised, the blast radius stays small
Start with identity
Zero Trust does not require a big-bang migration. A realistic sequence: (1) roll out MFA, (2) consolidate accounts behind SSO, (3) add device-based conditional access, then (4) gradually replace VPN with ZTNA.
Steps 1 and 2 deliver outsized value for their cost and can often be completed within weeks. Conversely, deploying a ZTNA product on top of a messy identity foundation delivers little.
Takeaway
Zero Trust is a design philosophy, not a product name. Map where you stand today and build up from identity — the seemingly slow path is the fastest one. Convey supports the whole journey, from assessment to rollout and operations.