Abstract: A data processing method and apparatus are proposed for used in the encryption, decryption and authentication of messages. A memory for storing input information, a set of operations and a processor for executing the operations on the stored input information are provided. The input information is utilized to select the order and number of operations performed. The operations are devised such that any possible input string will be interpreted as a valid program and the memory is extensible. Furthermore, data is output as a function of the input information. As a result the state of the memory generated during execution is indeterminate prior to execution and the process evolves differently for each possible input string. Accordingly, the process performed by the module cannot be described by an algorithm.

Abstract: An apparatus, a method and a computer program product for use when converting message information from a first format to a second format in packet transmitting systems.

Abstract: An apparatus, method and a computer program product for use as a key generator in conversion of message information from a first format into a second format, a first cipher unit (930) is arranged having a first cipher key input (908) and a data output (910) for outputting a data stream generated dependent on a first cipher key (EKEY) input via said first cipher key (908). A second cipher unit (910) having a plaintext input (901), a second cipher key input (903) and a ciphertext output (902) is via said second cipher key input (903) communicatively coupled to said data output (910) of the first cipher unit (930) for receiving a second cipher key (IKEY) in the shape of said data stream; and said first cipher unit (930) being arranged to perform, dependent on a predetermined rule, a renewed generation of a data stream for use as said second cipher key.