Mobile Phones as Secure Gateways for Message-Based Ubiquitous Communication. - Walter Bamberger; Oliver Welter; Stephan Spitz (WISTP, 2007)

Mobile Phones as Secure Gateways for Message-Based Ubiquitous Communication (Revised). - Walter Bamberger; Oliver Welter; Stephan Spitz; Michael Marhöfer (IACR Cryptol. ePrint Arch., 2007)

Data protection and risk management on personal computer systems using the trusted platform module. - Oliver Welter (2008)