Abstract
In recent years, information security requires randomly selected strong keys. Most of the proposed methods provide keys, which are based on chaotic cryptographic algorithms. In this paper, a fingerprint image encryption scheme, based on a chaotic true random bit generator (TRBG), is proposed. The chaotic generator is based on a non-linear electronic circuit, which produces double scroll chaotic attractors. The initial conditions and the values of the circuit parameters serve as the private key of the cryptographic scheme. We use two chaotic generators with different initial conditions, which produce the bits sequences that XOR-ed for generating the final bits sequence. A well known statistical suite for testing the distribution of the bits sequence was adopted. This sequence has been used to encrypt and decrypt the fingerprint images. Also, the security analysis of the encrypted image demonstrates the high security of the proposed encryption scheme.
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