CSD 3324 SPF

CSD 3324 SPF Secure Fax Encryption Device

CSD 3324 SPF Secure Fax Encryption - AES-256

The CSD 3324 SPF secures Group 3 fax communications for mission-critical government, corporate and private applications. The CSD 3324 SPF connects to Group 3 fax machines providing secure fax communications using the AES 256-bit encryption algorithm and Diffie-Hellman public key exchange key management for proven cryptographic strength, and ease of deployment and operation. The CSD 3324 SPF's secure fax encryption features are identical to the CSD 3324 SP secure voice telephone and fax encryption system; therefore, secure fax exchanges are 100% interoperable with the CSD 3324 SP secure fax encryption capability. The CSD 3324 SP also has AES-based secure voice.


  • Strategic-level security
  • Easily connects to any Group 3 fax machine via RJ-11 two-wire fax port
  • AES-256 with Diffie-Hellman public key exchange for simplicity, cryptographic strength and ease of use
  • Tamper-resistant design
  • Interoperable with TCC's CSD 3324 SP secure telephone/fax system
  • Auto-sensing incoming plain or secure fax
  • User-friendly, password-protected menu configurations
  • Auto-retraining to lower line rates to support degraded line conditions

Secure Fax Encryption Communications

Cryptographically secured fax transfers are automatically negotiated by initiating a fax exchange from any common Group 3 fax machine connected to the CSD 3324 SPF's modular RJ-11 two-wire serial fax interface. When the far end fax is also connected to a CSD 3324 SPF, the fax is automatically sent encrypted. The CSD 3324 SPF receiving the fax call automatically switches to the decryption function when it senses that the fax call was placed by another CSD 3324 SPF.

The CSD 3324 SPF has user-friendly and password protected menus to allow users to configure the device to accept only secured fax messages, or both plain and secure fax messages. Connection speeds are negotiated by the V.29 or the V.27/ter modem, based on line conditions.

Cryptographic Strength

The CSD 3324 SPF combines the proven strength of the 256-bit Advance Encryption Standard (AES-256) algorithm with the simplicity of deployment provided with 1,024-bit Diffie-Hellman public key exchange key management. A session key (256-bit key length), is auto-negotiated with every half-duplex fax call as well as a new 128-bit initialization vector. The CSD 3324 SPF also has anti-spoof protection and a tamper-resistant physical design.

Secure Fax CSD 3324 SPF Network Encryption

Secure Fax Encryption Specifications and Features


  Key Generator (Half Duplex)

  Encrypt AES-256 Engine

  Initialization Vector (IV)

  Session Key

  Decrypt AES-256 Engine

  Identical to ‘Encrypt’

  Same Session Key and IV

  128-bit Cipher Block Width

  Output Feedback (OFB)

  No error extension

Key Management

  Diffie-Hellman Public Key Exchange (D-H PKE)

  1,024-bit Modulus

  Each Exchange Results In:

  • Unique 256-bit Key Variable
  • Unique 128-bit IV

  Anti-Spoof Protection Data

  New exchange with each call

  Open Architecture Network

  Supports Rapid Deployments

General Features

  Auto-Answer (Fax Sense)

  User-configurable # of Rings

  Auto-Sense: Plain or Secure

  Display & Keypad

  LCD Display

  2-Lines / 16 Characters

  20-Push Button Keypad

  12-buttons standard keypad

  8 Function Key buttons

  Menu Access Password Prevents Unauthorized Access to Sensitive Menus


  Available in Beige or Black


  Operating Temperature: 0°C to +50°C

  Relative Humidity: 5% to 95% Non-condensing

Dimensions & Weight

  Width:  31.3cm (12.3 inches)

  Depth:   27.2cm (10.7 inches)

  Height:   10.3cm (4.1 inches)

 Weight:  2.34kg (5.15 pounds)

Black Interface

  TELCO Line

  2-Wire, RJ-11 Modular

Red Interface

  Group III Fax Interface

  2-wire, RJ-11 Modular

  Data Interface (Optional)

  RS-232 (25-pin 'D' / DTE)

Prime Power Input

  AC Power

  100 - 240VAC 50/60Hz

  9.5 Watts

  Typically 'Primary' Source

  DC Power

  10-30VDC (8 Watts)

  Primary or Back-Up Source

  Can Provide Power Back-Up Should AC Power Fail


TCC is dedicated to quality products and services. TCC is ISO 9001 certified. ISO 9001, granted to TCC by TUV, is the most stringent standard available for total quality systems in design/development, production, installation and servicing.

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