It’s also described as the asymmetry of cybersecurity/asymmetric advantage of attacker.

Modern security experts often criticize the literal “defender must be perfect, attacker only needs to succeed once” version, because defence in depth means one successful intrusion doesn’t necessarily equal a successful breach.

How It Works

**Check-ins:** The system or app asks you to "check in" or prove you are alive on a regular schedule (like once a day or once a week).

**The Trigger:** If you fail to respond or check in after a set amount of time and a grace period, the system assumes you are hurt, incapacitated, or dead.

**The Action:** It automatically sends out pre-written text messages, emails, or hidden files to the emergency contacts or recipients you chose ahead of time.