Patent ID: 8195951

Claim:
A method, comprising the following steps: receiving an encrypted data object, which is a data object at a computer that has been encrypted using an initial public authorization key of an initial asymmetrical cryptographic key pair that includes an initial private authorization key, accessing a further private authorization key, which together with a further public authorization key forms a further asymmetrical cryptographic key pair, retrieving a ciphertext, which comprises the initial private authorization key encrypted with the further public authorization key such that the ciphertext is assigned to the further asymmetrical cryptographic key pair, decrypting the encrypted initial private authorization key with the further private authorization key, decrypting the encrypted data object by means of the decrypted initial first private authorization key, and checking a signature of the encrypted data object, comprising the following steps: reading a signature of the encrypted data object, and verifying the signature of the encrypted data object, wherein the verification is effected with the further public authorization key.