Abstract
With the advancement in modern computational technologies like cloud computing, there has been tremendous growth in the field of data processing and encryption technologies. In this contest there is an increasing demand for successful storage of the data in the encrypted domain to avoid the possibility of data breach in shared networks. In this paper, a novel approach for speech encryption algorithm based on quantum chaotic system is designed. In the proposed method, classical bits of the speech samples are initially encoded in nonorthogonal quantum state by the secret polarizing angle. In the quantum domain, encoded speech samples are subjected to bit-flip operation according to the Controlled–NOT gate followed by Hadamard transform. Complete superposition of the quantum state in both Hadamard and standard basis is achieved through Hadamard transform. Control bits for C-NOT gate as well as Hadamard gate are generated with a modified Lu˙-hyperchaotic system. Secret nonorthogonal rotation angles and initial conditions of the hyperchaotic system are the keys used to ensure the security of the proposed algorithm. The computational complexity of the proposed algorithm has been analysed both in quantum domain and classical domain. Numerical simulation carried out based on the above principle showed that the proposed speech encryption algorithm has wider keyspace, higher key sensitivity and robust against various differential and statistical cryptographic attacks.
Highlights
Speech samples are mapped into quantum data media as nonorthogonal quantum state which could be in Standard or Hadamard basis
A standard Encryption Algorithm (AES), a fast colour image encryption algorithm based by hyperchaotic system [22], an algorithm based on hyperchaotic system and S boxes in the form of permutation–substitution network [23], and a colour image encryption based on quantum chaotic system [26] are taken for comparison
A new classical data encryption algorithm in quantum domain is proposed. e basic idea behind the security of the proposed algorithm lies in protecting the classical information in the form of nonorthogonal quantum states
Summary
Us, cryptanalysts have to design new algorithms according to the principle of quantum mechanics to protect classical information Chaos is another elucidating theory from the eld of nonlinear dynamics, which has potential applications in several. S–box generation mechanism based on chaotic function along with substitution and permutation process increases the complexity of the algorithm, consequentially enhances the security [18, 19]. Li et al, [32] designed a quantum colour image encryption based on multiple discrete chaotic systems where Logistic map, Asymmetric Tent map and Logistic Chebyshev map are used to generate control bits. Is proposed algorithm extends the security by encrypting quantum messages in both Standard and Hadamard basis Both secret rotating angles and initial conditions of the hyperchaotic systems constitute the key, which enlarges the keyspace.
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