Mobile communication terminal and method

A mobile communication method in WCDMA 3G communication, comprising:

• inputting, by a user, a short text message to a transmission-side communication terminal;
• requesting, by the transmission-side communication terminal, an S-USIM unit to generate a session key for encrypting the short text message;
• generating, by the S-USIM unit, the session key;
• generating encrypted data by encrypting the short text message using the session key;
• and
• transmitting, by the transmission-side communication terminal, the encrypted data to a reception-side communication terminal.

A mobile communication method in WCDMA 3G communication, comprising:

• receiving, by a reception-side communication terminal, encrypted data generated by encrypting a short text message from a transmission-side communication terminal;
• requesting, by the reception-side communication terminal, an S-USIM unit to generate a session key for decrypting the encrypted data;
• generating, by the S-USIM unit, the session key;
• generating the short text message by decrypting the encrypted data using the session key;
• and
• displaying the short text message to a user.