IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH. AND SIGNAL PROCESSING  
Hong Kong, April 6-10, 2003

"FREQUENCY-SELECTIVE PARTIAL ENCRYPTION OF COMPRESSED AUDIO"

Sequences used in our informal listening tests (128 kbit/s stereo signals sampled at 44.1 kHz): 

• Original sample: primavera
• Sample filtered at 1.5 kHz: primavera_filter_1.5
• Sample after a cryptanalysis-based attack of the low-pass filtering scheme at 1.5 kHz: primavera_filter_1.5_cryptanalysis
• Sample filtered at 5.5 kHz: primavera_filter_5.5
• Sample after a cryptanalysis-based attack of the low-pass filtering scheme at 5.5 kHz: primavera_filter_5.5_cryptanalysis