南京师范大学学报（工程技术版）
南京師範大學學報（工程技術版）
남경사범대학학보（공정기술판）
Journal of Nanjing Normal University(Engineering and Technology Edition)
2015年
3期
55-59
,共5页
数字视频%加解密%ARM7%骑士巡游变换%Arnold变换
數字視頻%加解密%ARM7%騎士巡遊變換%Arnold變換
수자시빈%가해밀%ARM7%기사순유변환%Arnold변환
digital video%encryption and decryption system%ARM7%Knight-tour transform%Arnold transform
为了在资源受限的ARM7嵌入式平台里实现数字视频加解密系统功能,在达到较好信息隐藏目的同时而不带来庞大的计算量是本文所关注的重点.加密算法方面,本文采用了基于Arnold变换和骑士巡游变换相结合的复合置乱算法.在算法软件实现时,本文对系统开销较大的骑士巡游算法进行了改进,找到一种基于映射表的方法,有效地避免了原算法不停查找巡游矩阵,从而大幅降低ARM7内核的系统开销,将处理一帧图像的速度提高了30倍左右.最后,给出了基于ARM7目标板进行加解密实验的结果分析.
為瞭在資源受限的ARM7嵌入式平檯裏實現數字視頻加解密繫統功能,在達到較好信息隱藏目的同時而不帶來龐大的計算量是本文所關註的重點.加密算法方麵,本文採用瞭基于Arnold變換和騎士巡遊變換相結閤的複閤置亂算法.在算法軟件實現時,本文對繫統開銷較大的騎士巡遊算法進行瞭改進,找到一種基于映射錶的方法,有效地避免瞭原算法不停查找巡遊矩陣,從而大幅降低ARM7內覈的繫統開銷,將處理一幀圖像的速度提高瞭30倍左右.最後,給齣瞭基于ARM7目標闆進行加解密實驗的結果分析.
위료재자원수한적ARM7감입식평태리실현수자시빈가해밀계통공능,재체도교호신식은장목적동시이불대래방대적계산량시본문소관주적중점.가밀산법방면,본문채용료기우Arnold변환화기사순유변환상결합적복합치란산법.재산법연건실현시,본문대계통개소교대적기사순유산법진행료개진,조도일충기우영사표적방법,유효지피면료원산법불정사조순유구진,종이대폭강저ARM7내핵적계통개소,장처리일정도상적속도제고료30배좌우.최후,급출료기우ARM7목표판진행가해밀실험적결과분석.
As ARM7 processor has limited capability of processing digital videos,this article has proposed a new way to implement the video encryption and decryption system based on ARM7 processor. The way that can encrypt the impor?tant information of video very effectively costs little calculation of processor and prevents the attacks from hackers.This implementation is based on the composite algorithem of Knight-tour transform and Arnold transform which can benefit from each other.As Knight-tour transform costs lots of calculations of CPU,this article has found a good way based on LUT(Look-up table)to reduce costs of calculation. The experiment based on ARM7 target has approved that the speed of processing a frame of vedio has been improved up to 30 times with the way from this article for encryption.
