Transparent encryption for HEVC using bit-stream-based selective coefficient sign encryption

Abstract

We propose a selective encryption scheme for HEVC which allows for transparent encryption in a wide range of quantization parameters. Our approach focusses on the AC coefficient signs, since they can be altered directly in the bit stream without entropy reencoding. This allows for fast encryption and decryption while retaining full format-compliance and length-preservation. Furthermore, we show our approach's applicability for a number of use cases by evaluating the quality degradation and robustness against attacks.