Secure password sharing with expiry dates

Most security controls require active effort to maintain. You have to remember to revoke access, rotate credentials, or delete old records. Expiry dates are different: they work automatically. Once you've set an expiry, the credential access window closes itself, regardless of whether anyone remembers to follow up.

This simple mechanism dramatically reduces the risk of stale, forgotten credential exposure.

Why expiry matters

Shared credentials have a natural lifecycle. You share a password to accomplish a specific task — onboarding a contractor, delivering a new account to a client, giving a developer temporary access to a staging environment. Once that task is complete, the need for the credential to be accessible via that link is gone.

Without expiry, that link (or that email, or that Slack message) remains accessible indefinitely. The contractor you onboarded six months ago left the company. The client has long since changed their password. The developer finished the project last year. But if any of those credentials are still sitting in an accessible form, they represent risk.

Expiry turns a permanent vulnerability into a time-bounded one. Even if nothing goes wrong during the valid window, you're eliminating the long tail of risk that accumulates when credentials persist indefinitely.

Types of expiry controls

Password sharing tools handle expiry in different ways:

Time-based expiry. The link becomes inactive after a set period — one hour, 24 hours, one week. This is appropriate when you know roughly when the recipient will access the credential.

Access-based expiry (one-time use). The link becomes inactive immediately after the first access, regardless of time. This ensures the credential is only ever seen once.

Combined expiry. The link expires after first use OR after a set time period, whichever comes first. This is the most secure approach: the credential is available until accessed or until the time window closes.

PassTransfer uses a combined approach: you set an expiry date, and the link also becomes inactive after the recipient views the credential. Either condition ending access is enough.

Choosing the right expiry window

The appropriate expiry window depends on the context:

Immediate delivery (same-day use). A 24-hour expiry is appropriate. Long enough for the recipient to see and act on the message; short enough that a missed email doesn't leave credentials accessible for weeks.

Contractor or vendor onboarding. A few days gives the recipient time to retrieve the credential as part of their onboarding process without the frantic urgency of a same-day window.

Client project handoffs. A week is usually sufficient for a client to retrieve and save credentials as part of a project transition.

Time-sensitive security situations. For emergency credential sharing where you need to ensure the credential is accessed promptly, a short expiry (one to four hours) creates the right urgency.

Expiry and organizational policy

For organizations with formal security policies — particularly those pursuing ISO 27001, SOC 2, or similar frameworks — expiry requirements can be codified:

• All shared credential links must expire within [X] days
• Links must not be regenerated after expiry without documented justification
• Credentials for contractor access must have expiry aligned with the contract end date

Making expiry a policy requirement, rather than a discretionary choice, ensures it's applied consistently. When different team members set different (or no) expiry windows, the organization's overall credential hygiene is unpredictable.

The compounding benefit

Expiry controls aren't just about individual credential sharing events. Over time, they shape your credential landscape. Organizations that consistently use expiring credential links have fewer stale, dormant credentials in circulation. When you audit access — which any serious security review will eventually require — the picture is cleaner: fewer credentials to account for, less historical exposure to explain.

In security, the less that persists unnecessarily, the better. Expiry dates are the simplest mechanism to enforce that principle in your credential sharing workflows.