Changes

‎Created claim: quote (P203): Upon installation, the app generates a key, which is a 32-bit random SK0 number, and registers with a central server with an ID different from SK0 and used by the server only to contact all registered apps for periodic updates related to infected people. Each app renews its key every day, calculating a new 32-bit random number SKt + 1 using a predefined hash function H1 having SKt as its argument.