Abstract: An apparatus, method and computer program are provided for managing memory page updates within non-volatile memory. The apparatus has processing circuitry for performing read and write operations for data to be stored in the non-volatile memory. The non-volatile memory is arranged as a plurality of memory pages, where each memory page comprises a plurality of chunks. A non-volatile chunk buffer is used to store data updates for multiple chunks prior to those data updates being made to the data stored in the non-volatile memory. Chunk tracking storage is then used to identify, for each chunk, when current data of that chunk is stored in the non-volatile chunk buffer rather than the non-volatile memory.

Abstract: A device is arranged to comprise a communication interface (20) to transmit data over the cellular network (60) to a destination device (65). The device further has a security module (25) providing one or more security domains (32), each security domain used to host a profile facilitating access by the device to the cellular network. At least one security domain hosts a profile that stores secret data and provides a token generation application to generate a token using at least the secret data. The device then outputs the token in association with the transmitted data, enabling the destination device to perform authentication of the transmitted data by invoking an authentication service (85) that also stores the secret data (50). Such an approach provides a particularly cost effective and robust mechanism for providing a highly trusted authentication of data transmitted over a cellular network.