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description Journal article public Jurnal Teknik Informatika dan Sistem Informasi

Implementasi Algoritma Chaos-Based Feedback Stream Cipher pada Enkripsi-Dekripsi Data Citra Digital

Theresia Anna, M. A. Ineke Pakereng, Yos Richard Beeh
Published 2009

Abstract

Chaos has suggested some new and efficient way to develop image encryption technique. It is because chaos has a chaotic random characteristic. Therefore chaos often  is used as a random  generator  in  image  encryption  and  decryption.  One  of  the  chaos  functions  is logistic  map.  The  logistic  map  is  a  polynomial  mapping  of  degree  2,  often  cited  as  an example of how complex chaotic behavior can arise  from very simple non-linear dynamical equations. The aim of  this research  is  to  implement  image cryptosystems using chaos  technique  combined  with  stream  cipher method,  feedback  function  and  256-bit  of external key. In stream cipher, chaos technique is used to replace key stream generator  to produce random seed. The  feedback  function  is  to encrypt with previous plain  image. The use of 256-bit  external  key  can be  represented as 32  characters  in ASCII. The  results  of testing  show  that  the  size  of  the  file  don’t  change  before  and  after  encryption  and decryption process,  there’s  time difference between encrypt and decrypt process and also different key can influence the output of encryption process.

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  • visibility 150 views
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