Encrypting Multimedia Data Using Modified Baptista’s Chaos-Based Algorithm

• Published in: Future Access Enablers for Ubiquitous and Intelligent Infrastructures Vol. 241; pp. 185 - 190
• Main Authors: Datcu, Octaviana, Hobincu, Radu, Stanciu, Mihai, Badea, Radu Alexandru
• Format: Book Chapter
• Language: English
• Published: Switzerland Springer International Publishing AG 2018; Springer International Publishing
• Series: Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering
• Subjects: Baptista-type algorithms; Chaos cipher; Multimedia data encryption
• ISBN: 9783319922126; 3319922122
• ISSN: 1867-8211; 1867-822X
• DOI: 10.1007/978-3-319-92213-3_27

One of the easiest to implement, yet complex, symmetric key chaos-based ciphers is the one proposed by Baptista in 1998. It has attracted much interest from scholars, who underlined its deficiencies and proposed different methods to enhance it. The present paper proposes an additional step in the encryption procedure - a modulo two sum between the binary representations of Baptista’s cryptograms and that of the value of the chaotic logistic map at that very iteration. This results in a flat distribution of the cryptograms. Thus, one of the major drawbacks of Baptista’s cryptosystem, the exponential decay of the repartition of the cyphertext values, is surmounted. The original Baptista’s algorithm is described, the proposed method is exemplified on a short message and its results are discussed when applied on multimedia files.