• Strategic-level security for voice and fax communications
• Excellent recovered voice quality
• Easily connects to any Group 3 fax machine
• AES 256-bit with Diffie-Hellman public key exchange for simplity, cryptographic strength and ease of use
• Interoperable with TCC's CSD 3324 SPF fax encryptor
• Auto-sensing incoming plain or secure fax
• User-friendly menu-based set up (may be password protected)
• Secure and non-secure modes; password protected secure-only mode
• Stored phone numbers: 50 names and phone numbers; last number redial
• Auto-answer/fax sense: user configurable number of rings

The CSD 3324 SP secures voice and fax communications in a single telephone package. The CSD 3324 SP has a fallback mode that was originally developed for poor HF channels. As a result, secure communications are possible even over degraded line conditions. Its 9,600 bps MPLP vocoder provides excellent recovered voice quality with automatic fallback to 4,800 bps CELP as needed.

A universal, 2-wire RJ-11 fax interface is provided on the phone enabling fax encryption regardless of the chosen brand of Group 3 fax used. The fax capability is auto-answering and auto-sensing, allowing incoming calls to be screened by the telephone. If the call is not a fax call, the telephone "rings" giving the user a second chance to answer any incoming voice calls.

Incoming and outgoing plain (non-secure) and secure fax communications, or secure-only fax mode are supported. Secure fax and voice communication modes may be password restricted. Without the password, the CSD 3324 SP functions in only non-secure mode. User-friendly menus, which may be password protected, provide logical set-up of the CSD 3324 SP's voice answering and fax handling options.

The CSD 3324 SP protects voice and fax calls using Advanced Encryption Standard (AES) encryption engines seeded using Diffie-Hellman public key auto-negotiated 256-bit session keys, and path-independent initialization vectors.

Public Key management: Diffie-Hellman (D-H) Public Key negotiated session keys and Initialization Vectors (IVs); 1,024-bit D-H modulus; six authentication characters used to prevent 'man-in-the-middle' attacks.

Key generator: AES 256-bit session keys; dual AES key generators, full-duplex and path-unique IVs