GSMK CryptoPhone for Windows Mobile offers secure end-to-end encrypted voice calls using the same 4096-bit Diffie-Hellman key exchange and 256-bit AES and Twofish symmetric encryption as all other GSMK CryptoPhone products. Unlike GSMK CryptoPhone secure mobile phones that feature a hardened operating system, secure storage, and secure messaging, GSMK CryptoPhone for Windows Mobile is a software-only voice encryption application and thus offers no protection against targeted attacks against the mobile device itself.

• Application-level GSM CSD-based voice encryption for commercial off-the-shelf smartphones
  
• Requires HTC S411, HTC P4350, or HTC Touch / Touch Viva compatible mobile phone
  
• Computer running Microsoft Windows XP with the latest Active Sync version, or Windows Vista/Windows 7 with the latest Windows Mobile Device Center version required for installation