I think you will find the answer here on w w w.group-ssi.com website
"Secphone Mobile is a full-secured phone which is designed and certified not only to prevent any kind of eavesdropping of communications on all bearers (Voice, Data…) and networks (ISDN, PSTN, GSM, 3G, satellite), but also to prevent any data theft for industrial espionage.
Secure your conversations on 3g
With SecphoneŽ-Mobile, wireless calls are potected against any attempt of interception.
Cryptographic elements are managed in a sartcard, offering a very high level of security.
Secphone Mobile is the first solution able to rovide a total security for communicating mobile evices on UMTS, with “on air” encryption for Voice
over IP and Data.
Secphone Mobile is also shipped with embedded ata encryption PIM module for files, personal iformation and emails.
A strong box security layer
ScphoneŽ-mobile is based on the CryptoSmart tchnology, a Javacard applet implementing a fully idependent cryptosystem from the handset. It povides high-level security (AES 256 bits encryption uing dual session keys – regenerated at each connection – RSA 1664 bits authentication, with Diffie-Hellman challenge)."