A Novel Encryption Approach with Fractional Discrete Cosine Transform and Cascading Discrete Orthonormal Stockwell Transform
Gaurav Sundaram, Snehan Shourya, Rajib Kumar Jha, Rashmi Ranjan Maharana, Latha Banda, Sumit Kumar · 2023
This paper proposes a new cryptographic algorithm based on fractional discrete cosine transform (FrDCT) and discrete orthonormal Stockwell (DOST) transform to secure multimedia data. Fractionality makes the cryptosystem more reliable and ensures the security of the data transmitted in the unsecured channel. The proposed method describes the advantage of using FrDCT instead of fractional Fourier transform (FrFT). At the same time, the energy compaction property of DOST guarantees lesser memory and storage requirements. The proposed method has been compared with state-of-the-methods to ensure practicality in different applications. The standard quantitative parameters such as information entropy (≈ 8), NPCR (≈ 99%), UACI (≈ 33%) etc., show its immunity against unauthenticated user(s).