Abstract: The invention relates to a computer-implemented method for handling revocation statuses of credentials, the method including: an issuing computer transmitting a public key to user and verifying computers, a revocation computer sending revocation parameters to user and verifying computer devices, issuing credentials to a user computer by an issuing computer, verifying issued credentials by the user computer, transmitting updated revocation information to the revocation computer by the verifying computer, updating provisional revocation status information by the revocation computer, updating revocation status information by the revocation computer, transmitting updated revocation information to a revocation computer by a verifying computer, updating provisional revocation status information by the revocation computer, transmitting updated revocation status information to the user and verifying computers by the revocation computer, creating a presentation token by the user computer, transmitting the presentation

Abstract: The invention relates to a computer-implemented method for handling revocation statuses of credentials, the method including: an issuing computer transmitting a public key to user and verifying computers, a revocation computer sending revocation parameters to user and verifying computer devices, issuing credentials to a user computer by an issuing computer, verifying issued credentials by the user computer, transmitting updated revocation information to the revocation computer by the verifying computer, updating provisional revocation status information by the revocation computer, updating revocation status information by the revocation computer, transmitting updated revocation information to a revocation computer by a verifying computer, updating provisional revocation status information by the revocation computer, transmitting updated revocation status information to the user and verifying computers by the revocation computer, creating a presentation token by the user computer, transmitting the presentation

Abstract: Privacy protecting metering is described such as for electricity, gas or water metering, metering use of cloud computing resources, traffic congestion charging and other metering applications. In examples, fine grained user consumption data is kept private and not disclosed to a provider of a resource consumed by the user. In examples, a bill generator receives certified meter readings and a certified pricing policy and generates a bill which omits fine grained user consumption data. For example, the bill generator generates a zero knowledge proof that the bill is correct and sends that proof to a provider together with the bill. In examples a provider is able to check that the bill is correct using the zero knowledge proof without finding out the user's private consumption data. In an embodiment the pricing policy is stored as signed rows of a table to enable efficient generation of the zero knowledge proof.