SOFTWARE PRODUCT AUTHENTICATION

摘要

The present application discloses a method and a system for authenticating software products. Computer software is often sold with a unique validation number. In order to register the product a user has to connect to a remote server and he is then asked to enter the validation number. The disadvantage of this is that it can take time, and further the verification can be delayed or entirely prevented due to network problems. The invention solves this problem by supplying a validator (219) with the software product so that the user can register and validate the software product off-line. In order to achieve this the validation number comprises an index and a validation code, which is the index signed with the software producer's private key. A corresponding public key (203) is distributed to the user and the user can then operate on the validation code and index using the validator (219) and the public key (203) to validate the validation code as one generated from the applied index and the private key.