Abstract: A popular way for mobile phone users to send and receive simple text messages is Short Message Service (SMS). A secure communication channel and environment for confidential data transmission is missing in the literature for SMS; therefore it is desirable to secure SMS by additional encryption. Encryption algorithms differ from one another by their ability to identify &prevent the valuable data against data hack attacks and their speed and efficiency in doing securing data. This study provides a performance comparison between the best symmetric encryption algorithms for usage in SMS communication: Blowfish and RC4 (Rivest Cipher 4)). The comparison analysis ran on parameters: size of text data, encryption time, decryption time, encryption throughput, decryption throughput, average encryption time and average decryption time. Based on analysing the criteria’s for efficient way of securing SMS, performance analysis of these algorithms under different parameters and input features is provided in the conclusion section.

Keywords: Cryptography, Decryption, Encryption, Blowfish, RC4.