USMHACS - Full System View

Full-screen hardware logic simulator for detailed inspection, interaction, and scenario testing.

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USMHACS HARDWARE SECURITY DIAGRAM

MONITORED ENV.

magneticSAFE
tempSAFE
pressureSAFE
laserSAFE
SensorsClick: Toggle
Physical KeyClick: Toggle
4-Bit Code (idle)Click: Cycle
Delay Block
Tamper Det.Click: Toggle

System Lockout

Buzzer

AND
solenoidrelay lock
DOOR

System Console Log

Logic Execution Flow

Sensors->Key->Code->Delay->Tamper->AND->Unlock

Access is granted only when every gate reports a valid hardware condition.

Attack Handling

  • Brute force attempt -> lockout latch triggered.
  • Environment breach -> tamper latch preserved until safe reset.
  • Wrong code sequence -> authentication rejected and path blocked.

Engineering Decisions

  • No MCU -> eliminates software attack surface
  • SR latch -> persistent tamper memory.
  • Delay block -> prevents rapid retry abuse.
  • Decoder/logic path -> deterministic access behavior.

Security Philosophy

Hardware-enforced deterministic security eliminates software vulnerabilities and ensures predictable system behavior.