Method and apparatus for the formation of a detection of size, a detection of a digital signing of an electronic file, as well as a method and apparatus for detecting that an electronic file has been digitally signed

摘要

As a detection of size, that an electronic file with its entire contents of a user has been signed, a detection size is used, the following components. The file in a first file format, a file signature, which as a function of the file in said first file format by digital signature has been formed, as well as a transformation signature, which as a function of the file in a second file format and optionally of further variables has been formed, wherein the file in the second file format has been transformed.