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

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

Algorithm 3 Step-wise voice encryption scheme.

Input: Plain audio file $P_{a}$ .
Output: Cipher audio file $C_{a}$ .
Begin
1. Load audio data $S_{P_{a}}$ and Set the control parameters ( $x_{(0)}$ , $y_{(0)}$ , n, and $α$ ) to generate the key block.
2. Generate the chaotic sequence.
3. Execute Equations (1) and (2) to change the chaotic sequence (different chaotic maps in Figure 2 can be used).
4. Change the chaotic sequence into a uniformly distributed sequence by change the initial values and parameters.
5. Permute $S_{P_{a}}$ using the proposed chaotic map for the secret key
6. Make the new vector as: $S_{P_{a}}$ = $S_{K_{a}}$ (index).
7. Adjust and changes t $S_{P_{a}}$ utilizing the proposed chaotic map and the accompanying condition: $S_{P_{a}} (i)$ = mod(round( $10^{12} S_{P_{a}} (i)), 256)$ .
8. Create the diffused vector with $S_{D_{a}} = S_{P_{a}} \oplus S_{K_{a}}$ , where ⊕ denotes the bit-wise XOR operation.
9. Create the final cipher audio matrix $C_{a}$ = reshape ( $S_{D_{a}}, P_{a}$ ).
End