A Chaotic-Based Encryption/Decryption Framework for Secure Multimedia Communications

. 2020 Nov 4;22(11):1253. doi: 10.3390/e22111253

Algorithm 2 Key steps of the proposed text encryption scheme.

Input: Plain-text file $P_{t}$ .
Output: Cipher text file $C_{t}$ .
Begin
1. Convert the plaintext file into a one-dimensional (1-D) array, $S_{P_{t}}$ .
2. Generate the chaotic sequence by selecting two of the proposed maps (Equations (1)–(4): $α = 0.9$ , $x_{(0)} = 0.1$ , and $y_{(0)} = 0.1$ ).
3. Change the chaotic sequence into a uniformly distributed sequence by changing the initial values and parameters.
4. Permute $S_{P_{t}}$ using the proposed chaotic map for the secret key
5. Create the new vector as: $S_{P_{t}}$ = $S_{K_{t}}$ (index).
6. Adjust and change $S_{P_{t}}$ utilizing the proposed chaotic map and the accompanying condition: $S_{P_{t}} (i) = \mod (round (10^{12} S_{P_{t}} (i)), 256)$ .
7. Create the diffused vector $S_{D_{t}} = S_{P_{t}} \oplus S_{K_{t}}$ , where ⊕ denotes the bit-by-bit exclusive OR operation.
8. Create the final cipher text matrix $C_{t}$ = reshape ( $S_{D_{t}}, P_{t})$ .
End