## 5 Conclusions  
We proposed a novel scheme for text encryption that combines elliptic curve cryptography and a Type IVa MP wavelet to enhance security and improve efficiency. The proposed approach involves three distinct phases: in the first phase, the plaintext is encoded using ASCII characters, and its representation is then subjected to diffusion; in the second phase, points on an elliptic curve are computed, and a mapping technique is applied to introduce randomization into the data; finally, in the third phase, the resulting output is decomposed using a Type IVa MP wavelet to generate the ciphertext. To examine the robustness of the proposed scheme and determine its reliability for secure text communication in various applications, we rigorously analyzed its security through a range of tests, including NIST analysis, entropy analysis, correlation analysis, key space analysis, key sensitivity analysis, plaintext sensitivity analysis, encryption quality analysis, ciphertext-only attack, known-plaintext attack, chosen-plaintext attack, and chosen ciphertext attack. \begin{table}
\begin{tabular}{l l l l l} \hline \hline
**Scheme** & **Key Space** & **Key Sensitivity** & **Ciphertext Only Attack** & **Known-Plaintext Attack** \\ \hline Proposed & Pass & Pass & Pass & Pass \\ Ref. [38] & Fail & Fail & Fail & Fail \\ Ref. [14] & Pass & Pass & Pass & Fail \\ Ref. [44] & Fail & Pass & Fail & Fail \\ Ref. [39] & Fail & Pass & Fail & Fail \\ Ref. [40] & Fail & Fail & Fail & Fail \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Comparison of security performance against different cryptographic attacks. The experimental results demonstrate that the correlation coefficient between the plaintext and ciphertext ranges from 0.001 to 0.08, indicating that it is very close to the ideal value of zero. Moreover, the percentage of encryption quality falls within the range of [76; 90], which is closer to the optimal percentage. The results also illustrate that the entropy of the ciphertext is significantly higher than that of the plaintext. Additionally, even minor changes to the input parameters lead to entirely different modified ciphertexts. The proposed text encryption scheme possesses a key space that is significantly larger than the acceptable value of \(2^{100}\), implying that the scheme has a substantial key space. Consequently, an attacker would face a challenging task when attempting to decrypt the text using the brute-force method. Furthermore, the results depict that the encryption and decryption times vary between 0.0254 and 0.0472 s, and 0.0256 and 0.3860 s, respectively, for plaintext lengths ranging from 30 to 5995 characters. These results provide compelling evidence that our designed encryption scheme is highly effective for cryptographic purposes. We compared our proposed encryption scheme with existing text encryption schemes to gain a broader understanding of its performance in comparison to the state-of-the-art schemes [10; 11; 12; 13; 14; 15; 16; 17; 18; 38; 39; 40; 41; 42; 43; 44]. We can list the following advantages of our approach:  
* Our results indicate that the designed scheme offers a high level of security, while maintaining reasonable computational efficiency, making it well suited for secure text communication in various contexts, including sensitive government communications, financial transactions, and personal messaging. * Additionally, the analysis performed depicts that our proposed scheme offers better resistance to modern cryptanalysis than the existing state-of-the-art text encryption schemes [10; 11; 12; 13; 14; 15; 16; 17; 18; 38; 39; 40]. As for disadvantages of our current approach, we can list the following:
* The designed encryption scheme is currently limited to text data, but it could be advantageous to broaden its application to include other types of data, such as images, audios, and videos. * Moreover, the results obtained by the proposed encryption scheme are not fully optimized. It would be useful to apply an optimization algorithm to attain an optimal level of security.