A 128‑bit access controller is the core enterprise‑grade processing hardware of a complete access control system. It adopts industry‑standard 128‑bit encryption for credential data communication between readers and mainboard, which greatly reduces risks of card data interception and cloning. As the central decision‑making unit, it stores user permission profiles, processes verification signals, outputs relay commands for electric locks or turnstile gates, and uploads access event logs to management software. Sintronic 128‑bit access controllers have been deployed for overseas access‑control projects including Nigeria and Saudi Arabia enterprise reference projectsSintronic.

Core Working Principle of 128‑bit Access Controller

Sintronic 128‑bit access controller follows secure access workflow: Credential Reading → 128‑bit Decryption & Verification → Permission Rule Check → Output Unlock Signal / Reject → Event Log Recording. Full‑cycle operation steps are described as follows.

1. Pre‑configuration by management software

System administrators use Sintronic ACS‑SW access‑control software to finish pre‑setup over TCP/IP network: import user cards / biometric data, configure time schedules, holiday rules, anti‑pass‑back, multi‑card unlock and alarm parameters. All permission data is encrypted and downloaded and saved locally into the 128‑bit access controller’s flash memory. The controller supports offline independent operation even when PC‑server network disconnects.

2. Credential reading & encrypted data transmission

User presents valid credential (RFID card, fingerprint, face) to connected reader device. The reader packages credential information with 128‑bit encryption and transmits data to access controller via Wiegand or RS485 bus. Encryption prevents man‑in‑the‑middle attacks and unauthorized data sniffing on transmission lines.

3. Decryption and permission validation

The access controller decrypts received data with built‑in 128‑bit algorithm. It compares credential ID against local stored user database. Then it checks whether this user has valid permission including time schedule, door authority and special access rules such as anti‑pass‑back.

4. Output execution instruction‑ Authorized access passed: Controller triggers relay output. It sends signal to activate electric door lock, or sends trigger signal to turnstile gate for opening. Meanwhile LED and buzzer give local pass prompt. ‑ Access denied: No unlock signal will be generated. Controller triggers local alarm prompt for invalid credential.

5. Event log recording & optional network upload

Every access activity (success, denied, alarm events) will be saved locally into controller’s memory. If LAN network remains connected, these event logs will synchronously upload to ACS‑‑SW management software for later audit and report‑generation. When network is offline, logs are cached locally and will auto‑upload once network recovers.

6. Alarm‑trigger handling

Door contact sensor monitors door status. If door remains open overtime or forced‑intrusion is detected, controller generates alarm event, which can be uploaded to management PC or trigger external alarm devices.