Abstract: The data processing system for the organization of lotteries by means of the internet is characterized in that winning numbers generated by a random number generator are provided with a signature, which can be checked within the system by the playing user such as to be able to securely verify such manipulations.

Abstract: The invention relates to a data processing system comprising a first subsystem (frontend) which can be externally accessed, and a second subsystem (rearend) which is connected to the first subsystem by a logical device which prevents unauthorized access, by means of operation in a security center. The second subsystem is otherwise locked. The second subsystem includes a random number generator, memory devices for data of participants in a lottery, including lottery numbers associated with the players, a winnings plan, and a computer for allocating the winnings to the participants having the ticket numbers corresponding to the numbers produced by the random number generator. The first subsystem also includes a computer for exchanging data with the participants and for informing the winners.