Content security is an important issue in multimedia applications. In

this paper we perform a cryptanalysis of several encryption algorithms

that have been proposed to protect the privacy of MPEG video streams.

In particular, we analyze the encryption based on permuting the Hu® man

codeword list, and two selective encryption algorithms - VEA and MVEA.

For the convenience of the reader, we provide a simple overview of MPEG

encoding, and we include all analyzed algorithms and their characteristics.-Content security is an important issue in multimedia applications. In

this paper we perform a cryptanalysis of several encryption algorithms

that have been proposed to protect the privacy of MPEG video streams.

In particular, we analyze the encryption based on permuting the Hu® man

codeword list, and two selective encryption algorithms- VEA and MVEA.

For the convenience of the reader, we provide a simple overview of MPEG

encoding, and we include all analyzed algorithms and their characteristics.