Key-dependent strategy based on a public key extracted from the local macroblock features and a private key owned at the target destination
Low
One
No: the algorithm can change low and high frequency residual ICT quantized coefficients
Hidden data randomness due to a key and local macroblock derivatives dependent algorithm
Proposed
CAVLC code word
Intrapredicted I-frames (luminance samples)
The secret message is ciphered using a private key [16] prior to the embedding process and divided into byte units
Lower (security does not rely on the local macroblock features, which demands higher computational resources)
Four
Yes: the algorithm is designed to change only high frequency residual ICT quantized coefficients and in an interlaced way, in order to try to avoid perceptual degradation and error propagation.
Deep understanding of the coding properties of the CAVLC entropy encoder for bit rate control and rapid embedding algorithm purposes