Toplam kayıt 4, listelenen: 1-4

  • Breaking an orbit-based symmetric cryptosystem 

    Solak, Ercan; Rhouma, Rhouma; Belghith, Safya Mdimegh (Pergamon-Elsevier Science LTD, 2011-09)
    We report a break for a recently proposed class of cryptosystems. The cryptosystem uses constant points of a periodic secret orbit to encrypt the plaintext. In order to break the system, it suffices to sort the constant ...
  • Comment on "Modified Baptista type chaotic cryptosystem via matrix secret key" [Phys. Lett. A 372 (2008) 5427] 

    Rhouma, Rhouma; Solak, Ercan; Arroyo, David; Li, Shujun; Alvarez, Gonzalo; Belghith, Safya Mdimegh (ELSEVIER SCIENCE BV, 2009-09-07)
    In this comment, we analyze a recently proposed Baptista-like cryptosystem and show that it is not invertible. Others weaknesses are also reported. A modified version of this cryptosystem is proposed to show how to overcome ...
  • Cryptanalysis of a multi-chaotic systems based image cryptosystem 

    Solak, Ercan; Rhouma, Rhouma; Belghith, Safya Mdimegh (ELSEVIER SCIENCE BV, 2010-01-15)
    This paper is a cryptanalysis of a recently proposed multi-chaotic systems based image cryptosystem. The cryptosystem is composed of two shuffling stages parameterized by chaotically generated sequences. We propose and ...
  • Cryptanalysis of a new substitution-diffusion based image cipher 

    Rhouma, Rhouma; Solak, Ercan; Belghith, Safya Mdimegh (ELSEVIER SCIENCE BV, 2010-07)
    This paper introduces two different types of attacks on a recently proposed cryptosystem based on chaotic standard and logistic maps. In the two attacks, only a pair of (plaintext/ciphertext) was needed to totally break ...