A portable device may be configured to transmit a digital signature of a user to an Internet terminal for the user to complete a transaction requiring a signature. The portable device may be a remote control, a personal digital assistance ("PDA"), an electronic pen, and the like. The portable device may include an wireless transceiver to provide transmit capability of the digital signature to the Internet terminal. The portable device may also provide receive capability to receive the digital signature of the user from another signature source and a memory to provide storage capability of the digital signature. Alternatively, the portable device may include an encryptor module to generate a digital signature based on a characteristic of the user and/or the portable device. The portable device may yet further include a keypad to provide an interface for the user to complete transactions requiring the digital signature provided by the portable device. Accordingly, by providing a user with a portable digital signature, the user may become mobile and have the capability to complete electronic transactions at any compatible Internet terminal.