SYSTEM AND METHOD FOR ENCRYPTING/DECRYPTING A CODED AUDIO SIGNAL, SYSTEM AND METHOD FOR GENERATING A SET OF CRYPTOGRAPHIC KEYS AND COMPUTER PROGRAM PRODUCTS

摘要

A method for encrypting a coded audio signal comprising a plurality of quality layers, is described wherein a first cryptographic key is generated for the audio signal, for each of at least one of the plurality of quality layers, a second cryptographic key is generated by applying a concatenation of one-way functions to the first cryptographic key and each of the at least one of the plurality of quality layers is encrypted using the second cryptographic key generated for the respective quality layer.