A Bio-Chaotic Block Cryptosystem for Privacy Protection of Multimedia Data
In this paper, we propose a novel bio-chaotic block cryptosystem by combining the features of chaos-based cryptography and biometric system for providing inviolable data confidentiality, nonrepudiation and authentication. The proposed system involves the extraction of wavelet features out of iris biometric template of user, which on chaotic shuffling and mixing with chaotic logistic sequences generates bio-chaotic keys. The encryption is carried out in cipher-block-chaining mode to fetch strong confusion of plaintext data. The proposed cryptosystem offers two-level of security, as the generated keys are under the control of random secret key and biometric template as well. The NIST SP800-22 randomness tests of generated bio-chaotic keys and other simulation tests like histogram distribution, correlation, entropy, etc., of ciphertext data validate the high security performance and suitability of the proposed cryptosystem for protecting the privacy of user’s sensitive data.
KeywordsBlock cryptosystem biometric template bio-chaotic keys wavelet transform chaotic system
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