英文文獻(xiàn)原文

Image Encryption using Chaos Theory

 

Minal Govind Avasare Electronics and Telecommunication D.J.Sanghvi College of Engineering

Mumbai, India

minalavsare@yahoo.co.in

 

Vishakha Vivek Kelkar Electronics and Telecommunication D.J.Sanghvi College of Engineering

Mumbai, India

kelkar.vishakha@gmail.com

 

 

Abstract— In open network, it is important to keep sensitive information secure from becoming vulnerable to unauthorized access. Encryption is used to ensure high security for Images. Chaos has been widely used for image encryption for its different features. There are many chaos based encryption techniques. Most of the proposed discrete chaotic cryptographic approaches are based on stream or block cipher schemes. If these two schemes are combined the security level is  improved.  Novel image encryption is proposed based on combination of pixel shuffling .Chaos is used for expand diffusion & confusion  in image .Chaotic maps gives advantages of large key space and high level security. We survey exiting work which uses different techniques for image encryption and analyse them with respect to various parameters. To eva luate security & performance, key space analysis, correlation coefficient, histogram, information entropy, NPCR, UACI etc. will be studied.

Keywords—encryption, chaos, permutation, diffusion

I. INTRODUCTION

In last few decades, digital information sharing has become more common with the fast development of Internet. However, in open networks, it is very much important to keep sensitive information such as military and medical images secure from becoming vulnerable to unauthorized access.

With the proliferation of the Internet and maturation of the digital signal processing technology, applications of digital imaging are preva lent and are still continuously and rapidly increasing today. Yet the main obstacle in the widespread deployment of digital image services has been。。。

英文文獻(xiàn)翻譯

 

基于混沌理論的圖像加密

摘要

在開放的網(wǎng)絡(luò)中，確保敏感信息的安全，防止變得容易受到未經(jīng)授權(quán)的訪問是重要的。加密技術(shù)是用來確保圖像的高安全性。混沌因?yàn)槠洳煌奶攸c(diǎn)已廣泛用于圖像加密中。在許多基于混沌的加密技術(shù)中，大多數(shù)提出的離散混沌加密方法是基于流或分組密碼方案。如果這兩個方案結(jié)合了安全水平的提高，那么新的圖像加密可以說是基于像素的置亂了?；煦绫挥糜跀U(kuò)大圖像擴(kuò)散度和混亂度，且混沌映射展現(xiàn)出了在密鑰空間大和安全性高的新優(yōu)勢。我們調(diào)查了現(xiàn)有階段使用不同的圖像加密技術(shù)的工作，分析了這些加密技術(shù)各個方面的參數(shù)。為了評估安全性和性能，密鑰空間分析，相關(guān)系數(shù)，直方圖，信息熵，nPCR，UACI等都進(jìn)行過深入的研究。

關(guān)鍵字：加密技術(shù)；混沌；置亂；擴(kuò)散

一 引言

    在過去的幾十年中，數(shù)字信息共享已經(jīng)隨著互聯(lián)網(wǎng)的快速發(fā)展而變得更常見。然而，在開放的網(wǎng)絡(luò)中，確保敏感信息如軍事、醫(yī)學(xué)圖像的安全，防止容易受到未經(jīng)授權(quán)的訪問是很重要的。

隨著互聯(lián)網(wǎng)技術(shù)的快速發(fā)展和數(shù)字信號處理技術(shù)的成熟，現(xiàn)在，數(shù)字成像應(yīng)用普遍存在，且仍在不斷地迅速地增長。然而，在數(shù)字圖像服務(wù)的廣泛部署的主要障礙是實(shí)施安全和確保敏感數(shù)據(jù)特別是多媒體數(shù)據(jù)的授權(quán)訪問。在這方面，一個直接的解決方案是使用那些具有LED的著名數(shù)論基礎(chǔ)的加密算法來掩蓋圖像數(shù)據(jù)流，比如數(shù)據(jù)加密標(biāo)準(zhǔn)（DES），國際數(shù)據(jù)加密算法（IDEA），以及由Rivest，夏米爾和Adleman開發(fā)的算法（RSA）[ 1 ] [ 2 ]。然而，這些加密算法的出現(xiàn)對于圖像應(yīng)用并不是很理想，這是因?yàn)閳D像數(shù)據(jù)量大、冗余度高的一些內(nèi)在特征，使得傳統(tǒng)加密技術(shù)會出現(xiàn)麻煩。

此外，上訴的加密算法需要額外的操作來壓縮圖像數(shù)據(jù)，從而要求計(jì)算時間長和高的計(jì)算能力。在實(shí)時通信中，由于其低的加密和解密速度，他們可以引入顯著的延遲。與大多數(shù)現(xiàn)有的加密標(biāo)準(zhǔn)以其為目標(biāo)的文本加密手段相比，圖像加密（或更一般的，多媒體加密）有其自身的特點(diǎn)和特殊的功能，具有許多獨(dú)特的規(guī)格。

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