Patent ID: 7917763

Claim:
A device for detecting a manipulation of an information signal, wherein the information signal includes an information signal component with side information and a further information signal component with main information, the side information being linked to the main information, implemented in hardware and comprising: an extractor for extracting the information signal component with side information and characteristic for the information signal from the information signal; an encryptor for encrypting the extracted information signal component with side information to acquire an encrypted signal; and a comparator for comparing the encrypted signal to a reference signal, the reference signal being an encrypted representation of a non-manipulated reference signal component with side information of a reference information signal to detect the manipulation, wherein the information signal is an audio signal, and the extractor is configured to divide-up the audio signal into audio-spectral values in conjunction with scaling parameters, and to assign all audio-spectral values to the further information signal component as the main information, and all scaling parameters to the information signal component as the side information so that the encrypted signal is independent of the audio-spectral values, but dependent on all scaling parameters.