Abstract: Based on determining (S211) that each of one or more NRFs of a mobile communication network system has become unavailable, switching (S213) to an NRF-unavailable state in which a validation of an NF service consumer based on an access token for a service request towards an NF service producer is relaxed is performed. The service request is sent (S215) towards the NF service producer, the service request comprising at least an indication of the NRF-unavailable state. Upon receipt (S221) of the service request, the service request is processed (S223) based on the indication of the NRF-unavailable state.

Abstract: According to an example aspect of the present invention, there is provided method, comprising: generating or receiving a first hash on the basis of the mobile network data change by a source network function, providing the first hash and security credentials information of the source network function for validation by a set of validator entities, and in response to detecting validation of the first hash and the security credentials information, generating a first transaction for a first blockchain, the first transaction being indicative of the mobile network data change and comprising the first hash.

Abstract: According to an example aspect of the present invention, there is provided method, comprising: generating or receiving a first hash on the basis of the mobile network data change by a source network function, providing the first hash and security credentials information of the source network function for validation by a set of validator entities, and in response to detecting validation of the first hash and the security credentials information, generating a first transaction for a first blockchain, the first transaction being indicative of the mobile network data change and comprising the first hash.

Abstract: A method for securely entering critical data in a computing device with a keypad, a keypad memory buffer, and a display, the keypad including a layout of keys. The method includes prompting a user to enter critical data into the computing device; generating a virtual keypad having substantially the same layout of keys as the layout on the keypad, with the keys in a random organization; displaying the virtual keypad on the display to the user; prompting the user to enter the critical data per the virtual keypad; receiving inputted data from the keys of the keypad in the keypad memory buffer; mapping the inputted data from the keys of the keypad memory buffer to the keys of the virtual keypad to determine the critical data entered via the virtual keypad, whereby the data read from the keypad memory buffer by any intruding application would not be the critical data; and supplying the critical data for further processing.