SecurePhone ™ allows you to use your Windows-based PC like a secure telephone. Conversations can be held over the Internet (using your existing TCP/IP stack) or over an ordinary telephone line (using a modem). Your conversations are encrypted and authenticated using standards based protocols. SecurePhone Lite is the free version of SecurePhone and is restricted to using 40-bit DES for encryption, 512-bit DSA keys for authentication, and lacks VoiceMail capabilities. SecurePhone Pro provides VoiceMail, Triple-DES encryption and a variety of key types and sizes (upto 2048-bit) for authentication. Additional graphic schemes may be downloaded from the website.