M.Sc. Tezi Görüntüleme

      On the behalf of the technologic development digital images are frequently used on the internet. Digital images have been one of the most widely used medium in steganography because of distribution of digital images as well as be easy to replicate, to hide data due to having enough noise.

      Although, chaos is considered as complexity, disorder, actually it is not an agnostic concept, and defining chaos as unknown future behavior of the system will be an incorrect diagnosis. Chaos is a knowing state, knowing that the future behavior of a system is unpredictable. Because of this property, chaotic maps have become popular in the random number generation, and recently has begun to be widely used.

      In this study, random numbers was generated with chaotic maps, and NIST (National Institute of Standards and Technology) tests are performed on these produced numbers. The numbers resulted in the achievement with NIST tests, used to resolve the weakness of sequentially classic LSB methods. Obtained stego images are compared by steganography uses discrete logarithm function which is in random sequence. Chaos based steganography complicates to regeneration of secret information, owing to sensitive connectivity of starting conditions of chaotic maps.

      Key Words: Chaos, Logistic Map, Steganography, Dynamic Systems