Smartphones typically store data locally or transmit it to the cloud, both of which pose significant security and privacy risks. Data transmission to cloud storage is vulnerable to interception, while local storage is susceptible to physical theft. To mitigate these risks, encryption of data at rest and in transit is essential. The Advanced Encryption Standard (AES) is widely employed for such purposes; however, its computational demands can strain the limited resources of smartphones. This study introduces an optimized version of AES, referred to as Enhanced AES, (E-AES) which incorporates modifications to the shift row transformation, reduces the number of encryption rounds, and integrates an XOR operation. These enhancements aim to improve both security and computational efficiency. Both the conventional AES and enhanced were implemented and compared based on several performance metrics, including avalanche effect, encryption and decryption time, and memory usage. The enhanced AES demonstrated an avalanche effect of 56.25%, higher than the 49.22% achieved by conventional AES, indicating improved security. Additionally, enhanced AES showed a slight speed advantage in encryption and decryption time. In terms of memory usage, E-AES used an average space of 1862.57(MB) when encrypting 1000KB while Conventional AES based application used an average space of 1864.34(MB). This means in every 1000KB encrypted our application saves 1.77(MB) of memory space.