Audio Encryption Using Ameliorated ElGamal Public Key Encryption Over Finite Field
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Audio Encryption Using Ameliorated ElGamal Public Key Encryption Over Finite Field Motilal Singh Khoirom1 · Dolendro Singh Laiphrakpam2 · Themrichon Tuithung1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Performing encryption using ElGamal public key encryption over finite field requires imbedding of message which is represented by integers. These integers are to be imbedded to a coordinate location that satisfy the elliptic curve equation using Koblitz imbedding technique. In doing so, data expansion takes place as each integer have to be represented as a coordinate. Recommended elliptic curves have large modulo prime value, so for every small integer representation of a message, the expansion in cipher text is massive. The above factors hinders the usage of ElGamal method for large data size encryption. In the ameliorated version, every coordinates in the elliptic curve equation is applicable for performing encryption operation. The typical Koblitz imbedding technique to specific coordinates satisfying the elliptic curve equation can be avoided. Data expansion trouble is taken care by using base conversion operation with multiple audio data. Simulation results and performance comparison with other public key cryptosystem signify that the proposed method is suitable for audio encryption operation. Keywords Elliptic curve cryptography · Audio encryption · ElGamal cryptosystem · Koblitz encoding technique
1 Introduction With increase in technology, exchange rate of multimedia data is also increasing. This enables easy creation of illegal copies of digital media and availability through different online services. Cryptographic transmission plays a vital role in transmitting secure data through various network channels. Various authors have suggested several methods for transferring multimedia data across the insecure network. A novel audio encryption scheme [1], is proposed based on cosine number transform. Their method accepts key space greater than 2256 and can be applied to non compressed audio data. Luma et al. [2] carried out encryption and decryption of wave audio message using elliptic curve over finite field. They also developed a tool to carry out the cryptographic operations which outputs better results * Motilal Singh Khoirom [email protected] 1
National Institute of Technology Nagaland, Dimapur, India
2
National Institute of Technology Silchar, Silchar, India
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than RSA. An audio encryption scheme is proposed by Elshamy et al. [3], using Baker or cat map followed by optical encryption using double random-phase encoding (DRPE) technique. Kumar et al. [4] proposed a modified Advanced Encryption Scheme (AES) for data security.The modified scheme is compared with other encryption like Data Encryption Scheme (DES), Triple Data Encryption Scheme (TDES) and AES. Liu et al. [5] have proposed a lossless dual-channel audio encryption scheme which adopts large key space, creating the algorithm impossible for brute-force at
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