Abstract: A computing platform (20) is adapted for secure use of trusted user input. The computing platform (20) comprises a user input device (14), a first isolated operating environment (21) for execution of applications requiring use of trusted user input, a second isolated operating environment (22) adapted for secure processing of information relating to a user, and a third isolated operating environment (23) adapted for secure communication with the user input device (14). In this computing platform, no isolated operating environment can communicate with another isolated operating environment other than by a secure path (26, 27) therebetween. When an application executing in the first isolated operating environment requires provision of trusted user input, the user provides user input through the user input device (14) to the third isolated operating environment (23).

Abstract: A client/server system has a client platform adapted to provide restricted use of data provided by a serve. The client platform comprises a display, secure communications means, and a memory containing image receiving code for receiving data from a server by the secure communication means and for display of such data. The client platform is adapted such that the data received from a server is used for display of the data and not for an unauthorised purpose. A server adapted to provide data to a client platform for restricted use by the client platform comprises a memory containing image sending code for providing an image of data executed on the server, and secure communications means for secure communication of images of data to a client platform. The server is adapted to determine that a client platform is adapted to ensure restricted use of the data before it is sent by the image sending code.