BlackSer - RS232 AES256 Link Encryptor


  • Protect your RS232 Devices
  • Seamlessly 'drops in' to your RS232 links
  • AES256 with FIPS 140-2 Level 3 compliant cryptography
  • Async RS232 up to 115k2
  • Transparent to Modbus, DNP, IEC101 etc.


The BlackSER is an in-line RS232 Data Encryptor with FIPS 140-2 Level 3 compliant cryptography and hardware. Serial data received on the DCE interface is encrypted using a 256 bit AES key and sent out the DTE interface. Serial data received on the DTE interface is decrypted using an 256 bit AES key and sent out the DCE interface.

BlackSER - RS232 in line encryption


Seamless Integration
Retrofit existing serial communications systems easily with the BlackSER simple bump-in-the-wire design protects: meters, protective relays, programmable logic controllers (PLCs), remote terminal units (RTUs), and computers from unauthorized access, control, eavesdropping, and malicious attack by authenticating and encrypting all serial data communications.

The BlackSER securely boots up as a protocol agnostic asynchronous Serial Data Encryptor executing inside of a tamper reactive cryptographic boundary. All cryptographic functions, including private and public key generation are performed inside FIPS Level 3 protected hardware. The cryptographic algorithms are FIPS certified. Internally generated keys use a NIST certified hardware seeded random number generator to ensure key entropy.

Military Grade Tamper Protection
Master key is secured within CPU Die Shield's Cryptographic Boundary. Dynamic fault detection with real time environmental and active tamper detection circuitry.

  • Achieves Active Level 3+ Tamper Protection
  • Transport Safe
  • Any attempt to physically attack the unit will wipe cyprographic keys

Secure and Effective Management
Management is achieved via a dedicated Ethernet interface and is accessed by an encrypted HTTPS session through a standard web browser.

Key Management
The BlackSER core cryptography is based upon a FIPS approved Hardware Security Module. FIPs requires a sophisticated protection private key generation, exportation and importation.



Item Description
RS232 Interfaces
  • 1 RS232 DCE (RJ50)
  • 1 RS232 DTE (RJ50)
  • Baud Rate: 1.2/2.4/4.8/9.6/19.2/38.4/57.6/115.2 kilobits
Serial Protocols

Asynchronous 8 bit: Modbus, DNP, IEC101, etc

LAN Management Interface

1 x Ethernet 10/100 BaseT Copper

  • Hardware True Random Number Generator
  • NIST SP 800-90 compliant DRBG
  • Secure Boot Loader: PKI Authentication
  • Memory Encryption And Integrity Check
  • Real-Time Clock
  • Tamper: Mechanical, Die-Shield, Temp & Voltage
  • Rack, Wall and Din Rail Mounting
  • Dimensions 102 x 153 x 26 mm (4 x 6 x 1in)
  • Weight: 454 grams; 1 pound
  • Temperature: operating -20 to 60°C,
  • Humidity: operating 10 to 90% / storage 0 to 95%

FIPS 140-2 Level 3 (Pending)


Symmetric algorithm: AES 256 bit

  • Web GUI - run in Web Browser
  • Syslog diagnostics support
Safety & Environmental


  • DB9 Connector: Dual Hot Standby 5 to 30 VDC
  • Power consumption: 4W

Ordering Information

Order Code Description
EN-BLKSER-232-AC BlackSER - RS232 AES256 Link Encrypter - AC PSU

More Information

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