Now showing items 1-13 of 13

  • Algebraic break of a cryptosystem based on discretized two-dimensional chaotic maps 

    Solak, Ercan; Çokal, Cahit (Elsevier Science BV, 2009-03-30)
    Recently, a cryptosystem based on two-dimensional discretized chaotic maps was proposed [T. Xiang, et al., Phys. Lett. A 364 (2007) 252]. In this Letter, we cryptanalyze the proposal using algebraic methods. We give three ...
  • Algebraic break of image ciphers based on discretized chaotic map lattices 

    Solak, Ercan; Çokal, Cahit (ELSEVIER SCIENCE INC, 2011-01)
    In this paper, we provide an algebraic cryptanalysis of a recently proposed chaotic image cipher. We show that the secret parameters of the algorithm can be revealed using chosen-plaintext attacks. Our attack uses the orbit ...
  • 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 "Encryption and decryption of images with chaotic map lattices" [Chaos 16, 033118 (2006)] 

    Solak, Ercan; Çolak, Cahit (AMER INST PHYSICS, CIRCULATION & FULFILLMENT DIV, 2008-09)
    In this paper, we comment on the chaotic encryption algorithm proposed by A. N. Pisarchik et al. [Chaos 16, 033118 (2006)]. We demonstrate that the algorithm is not invertible. We suggest simple modifications that can ...
  • 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 ...
  • Constructing a WordNet for Turkish using manual and automatic annotation 

    Ehsani, Razieh; Solak, Ercan; Yıldız, Olcay Taner (Assoc Computing Machinery, 2018-05-01)
    In this article, we summarize the methodology and the results of our 2-year-long efforts to construct a comprehensive WordNet for Turkish. In our approach, we mine a dictionary for synonym candidate pairs and manually mark ...
  • Cryptanalysis of a chaos-based image encryption algorithm 

    Çokal, Cahit; Solak, Ercan (ELSEVIER SCIENCE BV, 2009-03-30)
    A chaos-based image encryption algorithm was proposed in [Z.-H. Guan, F. Huang, W. Guan, Phys. Lett. A 346 (2005) 153]. In this Letter, we analyze the security weaknesses of the proposal. By applying chosen-plaintext and ...
  • Cryptanalysis of a cryptosystem based on discretized two-dimensional chaotic maps 

    Solak, Ercan; Çolak, Cahit (ELSEVIER SCIENCE BV, 2008-11-17)
    Recently, an encryption algorithm based on two-dimensional discretized chaotic maps was proposed [Xiang et al., Phys. Lett. A 364 (2007) 252]. In this Letter, we analyze the security weaknesses of the proposal. Using the ...
  • 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 ...
  • Cryptanalysis of Fridrich\'s chaotic image encryption 

    Solak, Ercan; Çokal, Cahit; Yıldız, Olcay Taner; Bıyıkoğlu, Türker (WORLD SCIENTIFIC PUBL CO PTE LTD, 2010-05)
    We cryptanalyze Fridrich's chaotic image encryption algorithm. We show that the algebraic weaknesses of the algorithm make it vulnerable against chosen-ciphertext attacks. We propose an attack that reveals the secret ...
  • Cryptanalysis of image encryption with compound chaotic sequence 

    Solak, Ercan (IEEE, 2009)
    Recently, an image encryption algorithm based on compound chaotic sequence was proposed [Tong et al., Image and Vision Computing 26 (2008) 843]. In this paper, we analyze the security weaknesses of the proposal. We give ...
  • Kaotik kriptografinin çilesi 

    Solak, Ercan (IEEE, 2013)
    Despite being an active research area for the last two decades, chaotic cryptography has not found a place in mainstream cryptography literature. This paper explores the reasons for this separation.