Why healthcare needs to ditch the password and switch to the PIN

When it comes to security, complexity isn’t the answer to better protection. Learn why in today’s healthcare environment and the current attack landscape, a short PIN provides greater security than a double-digit password.

Tell most people that a short PIN is more secure than a twelve-character password and they'll look at you like you've lost your mind.

It's a reasonable reaction. We've spent decades being told that password complexity equals security. Longer is better. Add symbols. Mix cases. Never reuse. The mental model is baked in: more complexity, more security.

That mental model is wrong in a specific and important way. And in healthcare environments — where authentication friction costs clinical time and password fatigue leads to workarounds that genuinely compromise security — understanding why matters.

The flaw in how we think about "what you know"

In multifactor authentication, "what you know" refers to a secret that only the legitimate user possesses. A password fits that description. So does a PIN.

The assumption is that a longer, more complex secret is harder to compromise. And in isolation, that's true. A twelve-character random password has a larger keyspace than a short PIN. Against a brute force attack with unlimited attempts, the password wins.

But that's not the threat model that matters.

A password is network-portable. It works from any device, in any location, over any connection. Which means it can also be stolen from any device, in any location, over any connection. Phishing, credential stuffing, keyloggers, man-in-the-middle attacks, password spraying — these are all possible precisely because the password isn't bound to anything. It's a secret that travels.

A PIN paired with a proximity card doesn't travel in the same way. The PIN authenticates you as the legitimate holder of that card. Without the card, the PIN is meaningless. Without the PIN, the card is useless. Together, they form a genuine two-factor credential that has no value to an attacker who doesn't have both — and no remote attack surface at all.

What this means in healthcare

Clinical environments have a specific authentication problem that general enterprise IT doesn't face at the same scale.

Clinicians move constantly, logging in dozens of times per shift. And each authentication event is friction that compounds. When the friction is high enough, clinicians find workarounds: shared credentials, sessions left open, passwords written down and taped to monitors.

These aren't security failures born from carelessness. They're rational responses to a system that wasn't designed for the constantly shifting environment it's operating in.

Complex system passwords make this worse in several ways. Password rotation policies mean clinicians are regularly learning new credentials under cognitive load. Complexity requirements produce passwords that are harder to type on clinical keyboards while wearing gloves or while watching a patient. Lockouts from failed attempts at 3:00 AM are not a minor inconvenience — they interrupt care.

A step forward in avoiding the inherent risks of passwords is the proximity card plus PIN model. Clinicians tap their badge at the reader and enter a short PIN. Authentication is done in seconds. The credential travels with them physically — on their badge — not in their memory through twelve rotating characters.

The security case, made plainly

Proximity card plus PIN is not a security compromise made for user convenience. It's a more appropriate security model for the actual threat landscape and the actual clinical environment. The attack vectors it's most resistant to — remote phishing, credential stuffing, password spraying — are the ones that actually compromise healthcare systems at scale. The security benefits of this approach include:

• The attack surface is fundamentally different. A compromised password is immediately useful to an attacker anywhere in the world. A compromised PIN is useless without the physical card it's paired with.
• Phishing resistance is structural, not behavioral. Security awareness training asks users to make the right decision under pressure, repeatedly, without error. Prox card plus PIN removes the decision from the user entirely.
• Credential sharing becomes harder to scale. Sharing a proximity card plus PIN requires handing over a physical object. It doesn't eliminate the possibility, but it makes a significant positive improvement to the risk profile.
• Brute force is physically constrained. An attacker attempting to brute force a PIN needs the physical card in hand, at a reader, attempting entries one at a time before lockout.
• Card revocation is immediate and centralized. If a badge is lost or an employee leaves, the card is deactivated and the credential is gone — regardless of whether the PIN was ever compromised.

Advancing beyond the basic model

In the journey to passwordless, the proximity card plus PIN combination is the most widely deployed model in healthcare today. And for most clinical environments, it's the right starting point. But the same principle extends further depending on the sensitivity of the environment.

For example, Imprivata authentication solutions enable deployments that supplement or replace the PIN with a biometric — including facial or fingerprint. Biometrics are a "what you are" factor rather than "what you know," but combining them with a physical credential gives layered verification that requires physical presence of the credential holder.

In addition, many organizations have deployed Imprivata Identity Assurance and Threat Detection to further fortify authentication. The solution provides adaptive, “step-up” risk-based verification to continuously assess identity trust and respond to threats in real time.

Shorter can be stronger. Understanding why is the first step in building authentication systems that clinicians will actually use. To learn more about advancing on the journey to passwordless, visit our website or download our passwordless whitepaper.