Abstract o achieve real-time encryption and video data transcoding, current video encryption methods usually integrate encryption algorithm with video compression course. This paper is devoted to discussing the video encryption technology, by encrypting to avoid unauthorized person getting video data. This paper studied the H.264 entropy coding and proposed of CAVLC video encryption scheme which is combined with the process of entropy coding of H.264 CAVLC encryption scheme. Three encryption levels are proposed. In addition, a scrambling method is also proposed which makes the encrypted frames more robust in anti crack. This method showed more robust video data encryption function and compressive rate . Key word : Digital Video Encryption, Surveillance, Security, Encryption * 정회원, 전북대학교 영상정보신기술연구센터 (교신저자)접수일자 2013년 5월 16일, 수정완료 2013년 6월 12일게재확정일자 2013년 6월 14일Received: 16 May 2013 / Revised: 12 June 2013 / Accepted: 14 June 2013 * Corresponding Author: mrlee@chonbuk.ac.krCenter for Advanced Image and Information Technology, ChonbukNational University, Korea