Image encryption process based on a chaotic True Random Bit Generator

In recent years, information security requires randomly selected strong keys. Most of the proposed methods provide keys based on chaotic cryptographic algorithms. In this paper, an image encryption scheme based on a chaotic True Random Bit Generator (TRBG) is proposed. The chaotic generator is a nonlinear electronic circuit which produces double scroll chaotic attractors. The values of the circuit parameters and the initial conditions are the keys of the cryptographic scheme. Since the dynamic behavior of the circuit is so unpredictable, a true random bits sequence is produced via a well known method. We adopt the FIPS 140-1 statistical suite to test the distribution of the bits sequence. This sequence is used to encrypt and decrypt images. Also, the security analysis of the encrypted image demonstrates the high security of the proposed scheme.